Keramisches Bauteil

Die vorliegende Erfindung betrifft ein keramisches Bauteil enthaltend Siliziumkarbid sowie die Verwendung des Bauteils.

Faserverstärkte keramische Verbundwerkstoffe

Faserverstärkte keramische Verbundwerkstoffe, dadurch gekennzeichnet, daß sie mindestens zwei Lagen aus multidirektionalem Fasergewebe als Verstärkung enthalten, wobei mindestens 5% der Fläche jeder Fasergewebelage von Matrixmaterial durchsetzt ist, Reibscheiben, die diese als Kern- oder Tragzone enthalten, Verfahren zu deren Herstellung und deren Verwendung als Brems- oder Kupplungsscheiben.

FIBRE-REINFORCED COMPOSITE CERAMICS AND METHOD OF PRODUCING THE SAME

The invention concerns fibre-reinforced composite ceramics with high- temperature fibres, in particular based on Si/C/B/N, which are bound in term s of reaction to an Si-based matrix. These composite ceramics are produced by impregnating bundles of fibrous material comprising Si/C/B/N fibres with a binder which is suitable for pyrolysis and solidifying the binder, the fibro us material bundles then optionally being conditioned with a silicating protective layer suitable for pyrolysis, such as for example phenolic resin or polycarbosilane. Subsequently a mixture of fibrous material bundles, fillers , such as for example SiC and carbon in the form of graphite or carbon black, and binders is produced. The mixture is then compacted to form a green compa ct which is then pyrolysed under vacuum or protective gas in order to produce a porous shaped body which is then infiltrated, preferably under vacuum, with molten silicon. In this way, fibre-reinforced composite ceramics which have greatly improved properties with respect to conventional composite ceramics and are in particular suitable for use in heavy-duty braking systems can be produced in an efficient manner suitable for production on an industrial sca le.

METHOD FOR PRODUCING BRAKE DISKS CONSISTING OF CERAMIC PARTS WITH METAL HUBS

The invention relates to a method for producing brake disks with friction surfaces consisting of ceramic materials, especially composite materials. At least one ceramic part is placed in a diecasting mould and is joined to molten metals by casting under pressure, in order to obtain a rotationally symmetrical body. Said body contains at least one ceramic (composite) segment that is symmetrical to the axis of rotation of the metal body and projects beyond at least one surface of the metal body that is perpendicular to said axis. © KIPO & WIPO 2007 ...

Friction discs having a structured ceramic friction layer and method of manufacturing the friction discs

A cylindrical ring-shaped friction disc contains a support body, at least one friction layer, and in each case an intermediate layer arranged between the support body and the friction layer. The intermediate layer has mutually adjoining flat regions with different coefficients of thermal expansion. A method teaches how to produce such a friction disc, and to the use the friction disc as parts of brake and clutch systems, in particular for motor vehicles.

Polymer-bonded fiber agglomerate, fiber-reinforced composite material and processes for producing the same

A polymer-bonded fiber agglomerate includes short fibers selected from carbon, ceramic materials, glasses, metals and organic polymers, and a polymeric bonding resin selected from synthetic resins and thermoplastics. The fiber agglomerates have an average length, measured in the fiber direction, of from 3 mm to 50 mm and an average thickness, measured perpendicularly to the fiber direction, of from 0.1 mm to 10 mm. At least 75% of all of the contained fibers have a length which is at least 90% and not more than 110% of the fiber agglomerate average length. A fiber-reinforced composite material having the fiber agglomerate and processes for the production thereof are also provided.

Verfahren zur Herstellung von Formkörpern aus faserverstärkten keramischen Materialien

Verfahren zur Herstellung von Formkörpern aus faserverstärkten keramischen Materialien, wobei im ersten Schritt Kerne ein Grünkörper hergestellt wird, indem in eine Form eine preßfähige Masse gefüllt wird, wobei die preßfähige Messe Kohlenstoffasern und/oder Kohlenstoffilamente und Pech und/oder Harze enthält, welche bei Wärmebehandlung unter Ausschluß von Oxydationsmitteln Kohlenstoff-haltige Rückstände bilden, im zweiten Schritt der Grünkörper durch Erwärmen auf eine Temperatur von 120 DEG C bis 280 DEG C unter Druck verfestigt wird, im dritten Schritt der auch als Vorkörper bezeichnete verfestigte Grünkörper durch Erhitzen in einer nicht oxydierenden Atmosphäre auf eine Temperatur von ca. 750 DEG C bis ca. 1100 DEG C zu einem C/C-Körper carbonisiert wird, wobei die Erwärmung im ersten, zweiten und/oder dritten Schritt zumindest anteilsweise dadurch bewirkt wird, daß ein elektrischer Strom durch die preßfähige Masse, den Grünkörper und/oder den verfestigten Grünkörper geleitet wird, nach ...

Keramische Faserverbundbauteile

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines keramischen Faserverbundbauteils umfassend die folgenden Schritte: a) Bereitstellen eines kohlenstoffbasierten und/oder keramischen, z.B. siliziumcarbidbasierten Körpers, welcher mittels additiver Fertigung hergestellt worden ist, b) Anbringen eines faserhaltigen Verstärkungselements am Körper, und c) Verbinden von Körper und Verstärkungselement durch Infiltration mit Silizium oder mit einer siliziumhaltigen Verbindung sowie nach dem Verfahren erhältliche keramische Faserverbundbauteile und deren Verwendung.

FIBRE-REINFORCED COMPOSITE CERAMICS INFILTRATED WITH MOLTEN METAL

The invention concerns fibre-reinforced composite ceramics infiltrated with molten metal and comprising high-temperature fibres in particular based on Si/C/B/N, which are bound in terms of reaction to an Si- based matrix. The invention also concerns a method of producing such ceramics. The molten silicon used for infiltration purposes contains additions of iron, chromium, titanium, molybdenum, nickel or aluminium, molten silicon containing approximately 5 to 50 weight % iron and approximately 1 to 10 weight % chromium being particularly preferred. The production method is simpler than conventional molten silicon infiltration methods and imparts improved properties to the composite ceramics.

Schichtverbundpanzerung

Die vorliegende Erfindung betrifft eine Schichtverbundpanzerung (12) für ein Kraftfahrzeug, aufweisend eine außenliegende Keramikschicht (3) und eine innenliegende Metallschicht (4), wobei zwischen der Keramikschicht (3) und der Metallschicht (4) eine Zwischenschicht (10) angeordnet ist. Mit der vorliegenden Schichtverbundpanzerung (12) ist es somit möglich, eine Panzerung mit sehr guten Panzerungseigenschaften bei gleichzeitig geringem spezifischem Flächengewicht bereitzustellen. The present invention relates to a laminated armor (12) for a motor vehicle, comprising an outer ceramic layer (3) and an inner metal layer (4), wherein between the ceramic layer (3) and the metal layer (4) an intermediate layer (10) is arranged. With the present layered composite armor (12), it is thus possible to provide armor with very good armor properties with a low specific basis weight at the same time.

Method to manufacture brake discs with ceramic friction surfaces; involves inserting at least one ceramic part in die casting mould and casting symmetrical body from molten metal under pressure

The method involves inserting at least one ceramic or ceramic composite part in a die casting mould and casting under pressure with molten metal to form a rotationally symmetrical body. The body contains at least one ceramic segment, which is symmetrical to the rotation axis of the body and projects from at least one surface of the body that is perpendicular to the axis. A ceramic ring disc or two parallel ceramic ring discs may be inserted. An Independent claim is included for a brake disc manufactured according to the method.

PROCEDURE FOR THE PRODUCTION OF BRAKE DISKS FROM CERAMIC(S) PARTS WITH METAL HUBS AND A BRAKE DISK PRODUCIBLE IN THE PROCEDURE

WITH FIBER BUNDLES STRENGTHENED COMPOSITE MATERIAL WITH CERAMIC MATRIX

METHOD FOR PROTECTING HEAT EXCHANGER PIPES IN STEAM BOILER SYSTEMS, MOLDED BODY, HEAT EXCHANGER PIPE, AND STEAM BOILER SYSTEM

In order to protect heat exchanger pipes (1) in steam boiler systems, special casing elements (2) made of fiber-reinforced ceramic are proposed. Said casing elements prevent or reduce the formation of films and corrosion on the heat exchanger pipes and thus enable higher steam parameters of the boiler system and a correspondingly increased thermal efficiency.

PROCEDURE FOR THE PRODUCTION OF A FIBER-REINFORCED ONE, AT LEAST IN THE BOUNDARY REGION MADE OF A METAL COMPOUND CERAMIC(S) OF EXISTING MATERIAL

PROCEDURE FOR IMPREGNATING SHORT FIBER BUNDLES FROM CARBON FIBERS

Method for producing brake disks consisting of ceramic parts with metal hubs

FIBRE-REINFORCED COMPOSITE CERAMICS AND METHOD OF PRODUCING THE SAME

The invention concerns fibre-reinforced composite ceramics with high- temperature fibres, in particular based on Si/C/B/N, which are bound in terms of reaction to an Si-based matrix. These composite ceramics are produced by impregnating bundles of fibrous material comprising Si/C/B/N fibres with a binder which is suitable for pyrolysis and solidifying the binder, the fibrous material bundles then optionally being conditioned with a silicating protective layer suitable for pyrolysis, such as for example phenolic resin or polycarbosilane. Subsequently a mixture of fibrous material bundles, fillers, such as for example SiC and carbon in the form of graphite or carbon black, and binders is produced. The mixture is then compacted to form a green compact which is then pyrolysed under vacuum or protective gas in order to produce a porous shaped body which is then infiltrated, preferably under vacuum, with molten silicon. In this way, fibre-reinforced composite ceramics which have greatly improved ...

Process for producing shaped bodies of carbon fiber reinforced carbon

A process is provided for producing shaped bodies including carbon fiber reinforced carbon in which the fibers are present in the form of bundles having a defined length, width and thickness. The defined configuration of the fibers in the bundles allows a targeted configuration of the reinforcing fibers in the carbon matrix and thus a structure of the reinforcement which matches the stress of shaped bodies including carbon fiber reinforced carbon, for example brake disks.

Fibre-reinforced composite ceramics and method of producing the same

The invention provides a fiber-reinforced composite ceramic containing high-temperature-resistant fibers, in particular fibres based on Si/C/B/N, which are reaction-bonded to a matrix based on Si, which is produced by impregnating fiber bundles of Si/C/B/N fibers with a binder suitable for pyrolysis and solidifying the binder, if desired subsequently conditioning the fiber bundles with an antisilicization layer suitable for pyrolysis, for example phenolic resin or polycarbosilane, subsequently preparing a mixture of fiber bundles, fillers such as SiC and carbon in the form of graphite or carbon black and binders, pressing the mixture to produce a green body and subsequently pyrolysing the latter under reduced pressure or protective gas to produce a porous shaped body which is then infiltrated, preferably under reduced pressure, with a silicon melt. This makes it possible to produce, in an efficient manner suitable for mass production, fiber-reinforced composite ceramics which have significantly ...

Process for the impregnation of carbon fiber bundles, resin-impregnated carbon fiber bundle, shaped body and intermediate body for silicization

A process for the impregnation of carbon fiber bundles enables the carbon fiber bundles to be impregnated with a curable liquid resin without the impregnated fiber bundles sticking together. The fiber bundles are present in a mechanically generated fluidized bed during the impregnation and are held in the fluidized bed until the resin has been cured or at least dried. A resin-impregnated carbon fiber bundle, a shaped body and an intermediate body for silicization are also provided.

Verfahren zur Herstellung eines Polysilans

Ein Verfahren zur Herstellung eines Polysilans umfasst den Schritt des Reagierens von (i) wenigstens zwei Silanmonomeren und (ii) wenigstens einem Alkalimetall, wobei die Silanmonomere die folgenden Struktureinheiten enthalten: wenigstens eine Arylgruppe, wenigstens eine Alkylgruppe, wenigstens eine Alkenylgruppe sowie wenigstens drei Halogenatome, wobei wenigstens drei der Halogenatome an ein Siliciumatom eines der Silanmonomere gebunden sind.

Verfahren zum Schutz von Wärmetauscherrohren in Dampfkesselanlagen, Formkörper, Wärmetauscherrohr und Dampfkesselanlage

Use of elements made of a fibre-reinforced composite material with ceramic matrix

Clutch linings comprising fiber-reinforced ceramic materials

Clutch lings comprising fiber-reinforced ceramic materials which comprise carbon fibers and whose matrix material is selected from among inorganic polymers, oxidic ceramics, set cements, organoelement polymers and finely divided inorganic solids which are held together by an inorganic or organic binders.

Friction-tolerant disks made of fiber-reinforced ceramic

A composition comprising polymer-bound fiber tows containing carbon fibers, the polymer-bound fiber tows having an average length of 3 mm to 50 mm measured in the fiber direction, and an average bundle thickness of 0.1 mm to 10 mm measured perpendicular to the fiber direction, and in which at least 75% of all polymer-bound fiber tows have a length that is at least 90% and not greater than 110% of the average length combined with a carbon-ceramic material.

METHOD FOR IMPREGNATING BUNDLES OF CARBON FIBER TO STABLY PERFORM AN IMPREGNATING PROCESS OF CARBON FIBERS

PURPOSE: A method for impregnating bundles of carbon fiber bundles is provided to prevent the bundles of carbon fibers from sticking each other in curable resin, by maintaining the bundles of carbon fibers in a mechanically generated fluid layer until the resin is cured or dried so that the bundles no longer stick each other. CONSTITUTION: In a process of impregnating bundles of carbon fibers with curable resin of liquid type, the bundles of carbon fibers are present in a mechanically generated fluid layer during impregnation. The bundles of carbon fibers are maintained in the fluid layer until the resin is cured or dried so that the bundles no longer stick each other. Carbon fibers in the bundles of carbon fibers are maintained by a carbonized binding agent. © KIPO 2007 ...

FASERVERSTÄRKTE VERBUNDKERAMIK UND VERFAHREN ZUR HERSTELLUNG EINER SOLCHEN

Reibpaarung für Kupplungssysteme

Reibpaarung für Kupplungssysteme aus zwei Materialien, in der eines der Materialien ein faserverstärkter keramischer oder metallischer Werkstoff A ist, der Verstärkungsfasern aus Kohlenstoff oder keramischen Fasern oder Whiskern enthält, und das mit dem Material A in der Reibpaarung zusammenwirkende Material B ausgewählt ist aus keramischen B11 oder metallischen Werkstoffen B12, Sintermetallen B2, gesinterten oxidischen Keramiken B3, gesinterten nitridischen Keramiken B4, gesinterten carbidischen Keramiken B5 und organischen Sintermaterialien B6. friction pairing for coupling systems two materials in which one of the materials is a fiber reinforced ceramic or metallic material A, the reinforcing fibers of carbon or ceramic fibers or whiskers, and that with the material A in the friction pair co-operating material B is selected made of ceramic B11 or metallic materials B12, sintered metals B2, sintered oxide ceramics B3, sintered nitridic Ceramics B4, sintered carbide ceramics B5 and organic Sintered materials B6.

DEFENSIVE, CERAMIC BASED, APPLIOUE ARMOR, DEVICE FOR PROVIDING ANTI-PROJECTILE ARMORING PROTECTION AND PROCESS FOR PRODUCING CERAMIC BASED PROJECTILE ARMOR WITH HOLLOW GEOMETRY

A device and process of forming a defensive, ceramic based, applique armor for covering and protecting a substrate which may be exposed to attack by projectiles, the applique armor having a flat or curved armor plate formed of ceramic material and having a first surface and a second surface; wherein the ceramic material being formed of silicon carbide with carbon fibers (C/SiC) and the ceramic material has a plurality of holes on at least one of said surfaces; the holes having a diameter smaller than an anticipated bullet or ammunition projectile and the holes being set obliquely relative to at least one surface, whereby the device and process provide holes formed by press molding, boring, drilling, or combinations thereof.

Process for protecting fiber-reinforced carbon-containing composites against oxidation

Process for protecting fiber-reinforced, carbon-containing composites whose matrix comprises, at least in the outer layer, silicon carbide (SiC) and also silicon (Si) and/or silicon alloys against oxidation, which comprises the steps a) impregnation of the composite with an aqueous, phosphate-containing solution, b) drying, c) heat treatment at a temperature which is at least sufficient to convert the dried solution into insoluble compounds which are suitable for forming a self-healing glass, wherein the composite is treated oxidatively to form silicon oxide (SiO₂) either prior to step a), between steps a) and b) or during or after step b) and/or c).

Faserverbundbauteile

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines Faserverbundbauteils umfassend die folgenden Schritte: a) Bereitstellen eines Körpers, welcher mittels additiver Fertigung hergestellt worden ist, b) Anbringen eines faserhaltigen Verstärkungselements am Körper, und c) Erzeugen verbindenden Kohlenstoffs zwischen Verstärkungselement und Körper sowie nach dem Verfahren erhältliche Faserverbundbauteile und deren Verwendung.

Fiber-reinforced ceramic friction article, e.g. clutch disk or lining, brake disk or vehicle clutch disk, has oriented long-fibers, fleece or fabric and isotropic short fibers in core zone and mainly short fibers in friction layer

Fiber-reinforced ceramic friction articles have (1) a core zone reinforced with (a) long fiber bundles, fleece or (non)woven or knitted fabric and (b) short reinforcing fibers and (2) friction layer(s) containing less than 10 wt.% long fibers and up to 35 wt.% short fibers; >= 70 wt.% of the long fibers in the core zone are oriented in the plane of the article; and the orientation of the short fibers in the core zone is substantially isotropic. An Independent claim is also included for the production of the friction articles.

Production of hollow bodies made from fiber-reinforced ceramic materials used in the production of brake and clutch disks comprises forming molding cores

Production of hollow bodies made from fiber-reinforced ceramic materials comprises forming molding cores having the shape of the hollow chambers of the hollow bodies; inserting at least one molding core together with a fibrous material containing carbon fibers and/or carbon filaments and thermally hardenable binders into a mold; heating the mass to 120-280 deg C under pressure to form a green body; and carbonizing and/or graphitizing by heating to 750-1100 deg C with the exclusion of air and other oxidizing agents to form a C/C body. Heating in the second and/or third steps is carried out by passing an electric current through the pressable mass or green body and through at least one molding core. Preferred Features: The C/C body is infiltrated with liquid metal or silicon (alloy).

FIBRE-REINFORCED COMPOSITE CERAMICS AND METHOD OF PRODUCING THE SAME

The invention concerns fibre-reinforced composite ceramics with hightemperature fibres, in particular based on Si/C/B/N, which are bound in terms of reaction to an Si-based matrix. These composite ceramics are produced by impregnating bundles of fibrous material comprising Si/C/B/N fibres with a binder which is suitable for pyrolysis and solidifying the binder, the fibrous material bundles then optionally being conditioned with a silicating protective layer suitable for pyrolysis, such as for example phenolic resin or polycarbosilane. Subsequently a mixture of fibrous material bundles, fillers, such as for example SiC and carbon in the form of graphite or carbon black, and binders is produced. The mixture is then compacted to form a green compact which is then pyrolysed under vacuum or protective gas in order to produce a porous shaped body which is then infiltrated, preferably under vacuum, with molten silicon. In this way, fibre-reinforced composite ceramics which have greatly improved ...

CERAMIC MATRIX COMPOSITE REINFORCED WITH FIBER BUNDLES

PURPOSE: A ceramic matrix composite reinforced with fiber bundles is provided which has a uniform phase composition, micro crack structure and improved matrix and can be produced by conventional method. CONSTITUTION: The composite has ceramic matrix(24) and is reinforced with fiber bundles(20,21). The material comprises a reinforcing fiber bundle part(20) including two fiber bundle parts(20,21) having different fiber lengths divided by a minimum in the total fiber bundle distribution with respect to the fiber bundle length and a matrix bundle part(21). Also, the composite is characterized in that at least a part of the fiber bundles(20,21) has at least partially one or more of protective layer(s). © KIPO 2002 ...

USE OF MATERIAL PRODUCED FROM FIBER-REINFORCED COMPOSITE MATERIAL CONTAINING CERAMIC MATRIX

PURPOSE: A material produced from a fiber-reinforced composite material containing a ceramic matrix is provided, which material has a low specific gravity, good bulletproof properties and sufficient resistance to even repeated bullet hits, meets high safety requirements with respect to bullet hits and other impacts, and is used for forming a protective material. CONSTITUTION: The material comprises a fiber-reinforced composite material which has a ceramic matrix containing 10 wt% or more of silicon carbide, 5 wt% or more of carbon fiber and/or graphite fiber. At least one material has a size larger than 3 cm, preferably larger than 10 cm, more preferably larger than 30 cm in the direction perpendicular to the load direction. Preferably the material comprises an aluminium oxide fiber and/or a silicon nitride fiber and/or a Si/B/C/N fiber. © KIPO 2002 ...

FIBER-STRAND-REINFORCED COMPOSITE MATERIAL

PROBLEM TO BE SOLVED: To provide a fiber-strand-reinforced composite material having a ceramic-based matrix which is an improved matrix having a phase structure as uniform as possible or matrix having only a finer crack structure if any, and can be formed by a process using a conventional technique, and also to provide a production process of the composite material. SOLUTION: This strand-reinforced ceramic composite material which has a ceramic-based matrix 24 and contains strands classified into two different strand fractions 20 and 21, that is, a reinforcing strand classified fraction 20 and a matrix strand classified fraction 21, which are separated from each other by a minimum distribution point 6 in the whole strand distribution 1 with respect to strand length and have different mean values 5 and 4 respectively. COPYRIGHT: (C)2001,JPO ...

Reibpaarung für Kupplungssysteme

Reibpaarung für Kupplungssysteme aus zwei Materialien, in der eines der Materialien ein faserverstärkter keramischer oder metallischer Werkstoff A ist, der Verstärkungsfasern aus Kohlenstoff oder keramischen Fasern oder Whiskern enthält, und das mit dem Material A in der Reibpaarung zusammenwirkende Material B ausgewählt ist aus keramischen Werkstoffen B11, wie Aluminiumoxid, Aluminiumtitanat, Magnesiumoxid, Ytriumoxid, Hafniumoxid, Zirkonoxid, Bornitrid, Aluminiumnitrid, Siliciumnitrid, Titannitrid, Zirkonnitrid, Siliziumcarbid, Borcarbid, Titancarbid, Zirkoncarbid, Hafniumcarbid, Tantalcarbid und Wolframcarbid, wobei die keramischen Werkstoffe B11 einen Massenanteil von mindestens 40% Siliciumcarbid aufweisen und sie durch Infiltration mit Halbmetallschmelzen in die Poren der keramischen Werkstoffe B11 zu Werkstoffen B11' modifiziert sind.

Verfahren zum Oxidationsschutz faserverstärkter kohlenstoffhaltiger Verbundwerkstoffe und Verwendung eines nach dem Verfahren hergestellten Verbundwerkstoffes

Verfahren zum Oxidationsschutz faserverstärkter, kohlenstoffhaltiger Verbundwerkstoffe, deren Matrix zumindest in der Randschicht Siliziumkarbid (SiC) enthält, beinhaltend folgende Schritte a) Imprägnieren des Verbundwerkstoffs mit einer wässrigen, phosphathaltigen Lösung, b) nach Trocknung Durchführung einer Wärmebehandlung bei einer Temperatur, welche wenigstens ausreicht, um die getrocknete Lösung in nicht lösliche Verbindungen umzuwandeln, die zur Ausbildung eines selbstheilenden Glases geeignet sind, dadurch gekennzeichnet, dass der Oxidationsschutz an einem faserverstärkten, kohlenstoffhaltigen Verbundwerkstoff ausgebildet wird, dessen Matrix zumindest in der Randschicht neben Siliziumkarbid (SiC) auch Silizium (Si) und/oder Siliziumlegierungen beinhaltet, und dass der Verbundwerkstoff vor dem Schritt a) oder zwischen den Schritten a) und b) oder während oder nach dem Schritt b) zur Ausbildung von Siliziumoxid (SiO2) oxidierend behandelt wird.

Sandblasted ceramic surface, useful in ceramic components that are useful in clean room conditions, semiconductor industry and electronics, comprises a glass-ceramic layer

Sandblasted ceramic surface (1), comprises a glass-ceramic layer (2). An independent claim is also included for stabilizing sandblasted ceramic surfaces against subsequent material discharge, comprising oxidizing the sandblasted ceramic surface or coating the glass-ceramic layer with an inorganic polymer.

Defensive, ceramic based, applique armor, device for providing anti-projectile armoring protection and process for producing ceramic based projectile armor with hollow geometry

A device and process of forming a defensive, ceramic based, applique armor for covering and protecting a substrate which may be exposed to attack by projectiles, the applique armor having a flat or curved armor plate formed of ceramic material and having a first surface and a second surface; wherein the ceramic material being formed of silicon carbide with carbon fibers (C/SiC) and the ceramic material has a plurality of holes on at least one of said surfaces; the holes having a diameter smaller than an anticipated bullet or ammunition projectile and the holes being set obliquely relative to at least one surface, whereby the device and process provide holes formed by press molding, boring, drilling, or combinations thereof.

FIBRE-REINFORCED COMPOSITE CERAMICS INFILTRATED WITH MOLTEN METAL

The invention concerns fibre-reinforced composite ceramics infiltrated with molten metal and comprising high-temperature fibres in particular based on Si/C/B/N, which are bound in terms of reaction to an Si-based matrix. The invention also concerns a method of producing such ceramics. The molten silicon used for infiltration purposes contains additions of iron, chromium, titanium, molybdenum, nickel or aluminium, molten silicon containing approximately 5 to 50 weight % iron and approximately 1 to 10 weight % chromium being particularly preferred. The production method is simpler than conventional molten silicon infiltration methods and imparts improved properties to the composite ceramics.

Method for producing a ceramic substance for a ceramic material

A method for producing a ceramic substance includes producing a homogeneous mixture containing carbon fibers having a fiber length distribution of D5=<15 m and at least one powdery and carbonizable binder. The homogeneous mixture is compacted under the action of pressure. The compacted homogeneous mixture is thermally treating for carbonizing, or for carbonizing and graphitizing, to obtain a carbon substance. The carbon substance is siliconized to obtain a ceramic substance.

3-D PRINTING OF A CERAMIC COMPONENT

A method for producing the component, and to the use of the component. The method for producing a three-dimensional, ceramic component containing silicon carbide, by a) providing a powdery composition having a grain size (d50) between 3 microns and 500 microns and comprising at least 50 wt % of coke, b) providing a liquid binder, c) depositing a layer of the material provided in a) in a planar manner and locally depositing drops of the material provided in b) onto said layer and repeating step c), the local depositing of the drops in the subsequent repetitions of the step is adapted in accordance with the desired shape of the component to be produced, d) at least partially curing or drying the binder and obtaining a green body having the desired shape of the component, e) carbonising the green body, and 0 siliconising the carbonised green body by infiltration with liquid silicon. 116- (canceled)17. A method for producing a three-dimensional , ceramic component containing silicon carbide , comprising:a) providing a powdered composition having a grain size (d50) of between 3 μm and 500 μm, comprising at least 50 wt. % coke,b) providing a liquid binder,c) planarly depositing a layer of the material provided in a) and locally depositing droplets of the material provided in b) to said layer, and repeating step c), wherein the step of locally depositing the droplets in subsequent repetitions of said step is adjusted according to the desired shape of the component to be produced,d) at least partially curing or drying the binder and obtaining a green body having the desired shape of the component,e) carbonising the green body, andf) siliconising the carbonised green body by means of infiltration with liquid silicon, wherein the green body, while above the melting temperature of silicon and substantially above the surface of a silicon bath, becomes saturated with silicon by means of capillary forces.18. The method according to claim 17 , wherein the coke is selected from the ...

Reib- oder Gleitkörper aus mit Faserbündeln verstärkten Verbundwerkstoffen mit keramischer Matrix

The invention relates to a friction or slip body which consists of at least two composite materials, reinforced with fibre bundles and containing a ceramic matrix. A first composite material acts as a friction layer, forming the exterior of the slip body and a second composite material forms a support body which is in surface contact with the friction layer. The length of the fibre bundles of the friction layer is significantly shorter than the length of the fibre bundles of the support body. The bundles of fibres of the friction layer have a defined orientation that is perpendicular to the surface. The surface of the friction layer essentially has only small areas of a maximum 1.2 mm diameter of exposed carbon and the total proportion of exposed carbon on the surface is at maximum 35 %. The surface has a structure of extremely fine fissures and the friction layer has practically no tension close to the surface.

Faserverstärkter keramischer Verbundwerkstoff

Faserverstärkte keramische Verbundwerkstoffe, umfassend Faserbündel, -kabel oder -stränge von Langfasern, dadurch gekennzeichnet, daß die Langfaserbündel, -kabel oder -stränge vollständig von einer kurzfaserverstärkten Matrix umhüllt sind, wobei die Lang- und Kurzfasern unabhängig voneinander einen mittleren Durchmesser von 4 bis 12 mum aufweisen, und die Langfasern eine mittlere Länge von mindestens 50 mm und die Kurzfasern eine mittlere Länge von höchstens 40 mm haben, ein Verfahren zu ihrer Herstellung und ihre Verwendung zur Herstellung von Kupplungs- oder Bremsscheiben.

Innenbelüftete Bremsscheiben mit verbessertem Wärmeübergang

Innenbelüftete Bremsscheiben mit verbesserter Wärmeabführung, deren Kühlkanäle Stromstörer enthalten, die zu eienr Wirbelbildung der in den Kühlkanälen strömenden Luft führen, und Verfahren zu deren Herstellung.

Verfahren zur Herstellung eines Polysilans

Verfahren zur Herstellung eines Polysilans umfassend den Schritt des Reagierens von (i) wenigstens zwei Silanmonomeren und (ii) wenigstens einem Alkalimetall, wobei die Silanmonomere die folgenden Struktureinheiten enthalten:- wenigstens eine Arylgruppe,- wenigstens eine Alkylgruppe,- wenigstens eine Alkenylgruppe sowie- wenigstens drei Halogenatome, wobei wenigstens drei der Halogenatome an ein Siliciumatom eines der Silanmonomere gebunden sind, dadurch g e k e n n z e ich n e t , dass bei dem Schritt des Reagierens drei Silanmonomere eingesetzt werden, welche die folgenden allgemeinen Formeln (1) bis (3) aufweisen:(1) R1SiX3(2) R2R3SiX2(3) R4R5SiX2worin:R1eine Arylgruppe ist,R2eine Alkenylgruppe ist,R3, R4, R5, gleich oder verschieden, eine Alkylgruppe oder H, mit der Maßgabe, dass wenigstens einer von R3, R4oder R5eine Alkylgruppe ist, sind sowieX jeweils ein Halogenatom ist.

Bremssystem mit Verbundwerkstoff-Bremsscheibe

Bremssystem umfassend eine Reibpaarung aus organisch oder anorganisch gebundenen Metall-oder Sintermetall-haltigen und/oder CFC-haltigen Bremsbelägen und eine Bremsscheibe aus faserverstärktem Keramikverbundwerkstoff aus C/SiC, wobei die Bremsscheibe einen Tragkörper und mindestens eine Reibschicht umfaßt, dadurch gekennzeichnet, daß die Reibschicht der Bremsscheibe einen SiC-Anteil oberhalb von 65 % besitzt, und daß die Werkstoff-Zusammensetzungen in Tragkörper und Reibschicht der Bremsscheibe unterschiedlich sind.

Method for producing a ceramic component composed of a plurality of joined preforms and component obtained by the method

A method for producing a component includes a) providing at least two preforms each made of a carbon composite material, b) joining the at least two preforms at least at one respective connecting surface to form a composite, in which a joining compound is introduced between the joining surfaces of the preforms and then cured and the joining compound contains silicon carbide and at least one polymer adhesive, and c) siliconizing the composite to form the component. A component, such as an optical component produced thereby, is also provided.

Reibscheiben, Verfahren zu ihrer Herstellung und ihre Verwendung

Reibscheiben enthaltend eine Reibschicht und eine Kernzone aus faserverstärkten keramischen Verbundwerkstoffen, dadurch gekennzeichnet, dass die Kernzone mindestens zwei Lagen aus multidirektionalem Fasergewebe als Verstärkung enthält, wobei die einzelnen Fasergewebelagen jeweils vollständig durch die Matrix voneinander getrennt sind, und wobei mindestens 5 % der Fläche jeder Fasergewebelage durch Matrixmaterial ersetzt ist, derart dass das Matrixmaterial auch in einer Richtung senkrecht zur Ebene der Gewebelagen eine kontinuierliche Phase bildet.

Verfahren und Vorrichtung zum Prüfen von Carbon-Keramik-Bremsscheiben

Verfahren zum Prüfen von Carbon-Keramik-Bremsscheiben, bei dem eine rotierende Carbon-Keramik-Bremsscheibe durch induktive Erwärmung auf eine Temperatur zwischen 200 DEG C und 1500 DEG C erhitzt wird und nach Ablauf einer gewählten Belastungszeit auf Raumtemperatur abgekühlt und an einem Prüfstand ihre Berstdrehzahl ermittelt wird, und Vorrichtung zur Durchführung des Verfahrens.

PRODUCTION METHOD OF HOLLOW BODY MADE FROM FIBER- REINFORCED CERAMIC MATERIAL

PROBLEM TO BE SOLVED: To provide core material suitable for production of a carbon-reinforced ceramic body (C/C body) reinforced by fiber having desirable hollow shape. SOLUTION: In this production method of the C/C body having desirable hollow shape, at first a core forming the hollow shape with the core material is produced, secondly carbon fiber becoming the core and the C/C body and/or carbon yarn and compound containing pitch and/or resin is charged into a die and a green body is formed. Subsequently, the green body is heated and cured under pressure. The cured body is burned and carbonized in non-oxidizing atmosphere and the C/C body can be obtained. The core material at this time is infusible at a higher temperature than the curing temperature and, moreover, the material which has large contraction and is easily removed from the C/C material or C/C body is used. COPYRIGHT: (C)2003,JPO ...

Bremssystem mit Verbundwerkstoff Bremsscheibe

Bremssystem, umfassend eine Reibpaarung aus aus organisch oder anorganisch gebundenen Metall- oder Sintermetall-haltigen und/oder CFC-haltigen Bremsbelägen und eine Bremsscheibe aus faserverstärktem Keramikverbundwerkstoff aus C/SiC, wobei die Reibschicht und/oder die der Reibung ausgesetzte Oberflächenschicht der Bremsscheibe einen SiC-Anteil oberhalb von 65% besitzt, und die Werkstoff-Zusammensetzungen im Kern- und Oberflächenbereich der Bremsscheibe unterschiedlich sind, sowie Verwendung dieses Bremssystems in Kraftfahrzeugen, Schienenfahrzeugen oder Flugzeugen.

METHOD OF MANUFACTURING HOLLOW BODY MADE FROM FIBER- REINFORCED CERAMIC MATERIAL

(57)【要約】 （修正有） 【課題】液状金属で浸透処理、反応させることによって 繊維強化炭化物セラミックに転化する繊維強化複合体か らなる中空体の製造方法を提供する。 【解決手段】中空体形状製造用金型コアに炭素繊維及び ／または炭素フィラメント及び熱硬化性で炭化可能なバ インダーの混合物を入れ、加圧下で１２０℃〜２８０℃ の温度で加熱し、グリーンボディをつくる。次にこのグ リーンボディを非酸化性雰囲気中で約７５０℃〜約２４ ００℃の温度で加熱し炭化及び／または黒鉛化してＣ／ Ｃ体を製造する。上記硬化および炭化及び／または黒鉛 化の加熱は、少なくとも部分的に、組成混合物またはグ リーンボディまたは金型コアに電流を流すことによって おこなう。

METHOD FOR MANUFACTURING MOLDING CONSISTING OF FIBER-REINFORCED CERAMIC MATERIAL

PROBLEM TO BE SOLVED: To provide a method suitable for manufacturing a fiber-reinforced carbon-containing green body or its intermediate, particularly in a short cycle time with small energy consumption, which can be converted into a molding consisting of fiber-reinforced carbide ceramic, if necessary. SOLUTION: This method comprises the first step of putting in a press die a press molding material which contains a carbon fiber and/or a bundle of the carbon fibers and/or a carbon filament, the carbon fiber and/or the bundle of the carbon fibers and/or the carbon filament being coated with carbon or a carbon-containing compound, the pitch and/or the resinbeing cured thermally and carbonized, the second step of curing the press molding material by heating electrically at 120-280°C under pressure to produce the green body and the third step of carbonizing and/or graphitize the produced green body by heating electrically at about 750-2,400°C in a non-oxidizing atmosphere to produce a C/C body ...

Lanzenkopf für eine Blaslanze mit einem keramischen Düseneinsatz

Die vorliegende Erfindung betrifft einen Lanzenkopf 3 für eine Blaslanze 2 mit einem im Inneren des Lanzenkopfes 3 befindlichen Innenrohrs 9 für die Sauerstoffzuführung und mit mehreren von dem Innenrohr 9 abzweigenden, die Bodenwand des Lanzenkopfes 3 durchsetzenden Düsen 4, für einen Sauerstoffstrahl 5, wobei die Innenwände der Düsen 4 vollständig mit einem neuen feuerfesten Keramikmaterial, enthaltend C/SiC, beschichtet sind. Der Lanzenkopf 3 der Blaslanze 2 wird mit Wasser gekühlt. Dazu wird durch ein Mittelrohr 8 über die Blaslanze 2 Kühlwasser in den Lanzenkopf 3 zugeführt. Das Kühlwasser wird durch ein Außenrohr 7 zurückgeführt. Der Aufbau aus Mittelrohr 8, Wandung Innenrohr 12, Wandung Mittelrohr 11, Außenrohr 7 und Wandung Außenrohr 10 bildet einen Kühlmantel für den Lanzenkopf 3 und die Düsen 4.

METHOD FOR PRODUCING A CERAMIC COMPONENT COMPOSED OF A PLURALITY OF JOINED PREFORMS AND COMPONENT OBTAINED BY THE METHOD

A method for producing a component includes a) providing at least two preforms each made of a carbon composite material, b) joining the at least two preforms at least at one respective connecting surface to form a composite, in which a joining compound is introduced between the joining surfaces of the preforms and then cured and the joining compound contains silicon carbide and at least one polymer adhesive, and c) siliconizing the composite to form the component. A component, such as an optical component produced thereby, is also provided.

Defensive, ceramic based, applioue armor, device for providing anti-projectile armoring protection and process for producing ceramic based projectile armor with hollow geometry

A device and process of forming a defensive, ceramic based, applique armor for covering and protecting a substrate which may be exposed to attack by projectiles, the applique armor having a flat or curved armor plate formed of ceramic material and having a first surface and a second surface; wherein the ceramic material being formed of silicon carbide with carbon fibers (C/SiC) and the ceramic material has a plurality of holes on at least one of said surfaces; the holes having a diameter smaller than an anticipated bullet or ammunition projectile and the holes being set obliquely relative to at least one surface, whereby the device and process provide holes formed by press molding, boring, drilling, or combinations thereof.

FIBRE-REINFORCED COMPOSITE CERAMICS INFILTRATED WITH MOLTEN METAL

The invention concerns fibre-reinforced composite ceramics infiltrated with molten metal and comprising high-temperature fibres, in particular based on Si/C/B/N, which are bound in terms of reaction to an Si-based matrix. The invention also concerns a method of producing such ceramics. The molten silicon used for infiltration purposes contains additions of iron, chromium, titanium, molybdenum, nickel or aluminium, molten silicon containing approximately 5 to 50 weight % iron and approximately 1 to 10 weight % chromium being particularly preferred. The production method is simpler than conventional molten silicon infiltration methods and imparts improved properties to the composite ceramics. © KIPO & WIPO 2007 ...

FRICTION MEMBER MADE OF FIBER REINFORCED CERAMICS COMPOSITE MATERIAL

(57)【要約】 【課題】 コア即ち支持帯域と、少なくとも１つの摩擦 層とから成る、従来技術に比べて繊維で強化された摩擦 部材、及びその製造方法を提供する。 【解決手段】 セラミックス、特にＳｉ、ＳｉＣから成 るセラミックスの摩擦帯域と、繊維強化Ｃ／ＳｉＣ、特 に長繊維織布及び短繊で維強されたＣ／ＳｉＣから成る コア帯域から構成される摩擦部材、特に自動車の駆動力 を伝える摩擦クラッチ用クラッチディスク、又はセラミ ックス複合材料からなる摩擦ディスクを、特にＣ／Ｓｉ Ｃ摩擦ディスクの強度及び摩擦帯域と支持帯域との密着 力を改善し、更に摩擦面を摩擦及び摩耗に対し最適条件 にし、摩擦部材を技術的にも経済的にも効率の良い液体 シリコナイジング法により製造する。

Verfahren zum Oxidationsschutz faserverstärkter kohlenstoffhaltiger Verbundwerkstoffe

Die Erfindung betrifft ein Verfahren zum Oxidationsschutz faserverstärkter, kohlenstoffhaltiger Verbundwerkstoffe, deren Matrix zumindest in der Randschicht Siliziumkarbid (SiC) enthält, beinhaltend folgende Schritte: DOLLAR A a) Imprägnieren des Verbundwerkstoffs mit einer wässrigen, phosphathaltigen Lösung, DOLLAR A b) nach Trocknung Durchführung einer Wärmebehandlung bei einer Temperatur, welche wenigstens ausreicht, um die getrocknete Lösung in nicht lösliche Verbindungen umzuwandeln, die zur Ausbildung eines selbstheilenden Glases geeignet sind. DOLLAR A Die Erfindung sieht vor, dass der Oxidationsschutz an einem faserverstärkten, kohlenstoffhaltigen Verbundwerkstoff ausgebildet wird, dessen Matrix zumindest in der Randschicht neben Siliziumkarbid (SiC) auch Silizium (Si) und/oder Siliziumlegierungen beinhaltet, und dass der Verbundwerkstoff vor dem Schritt a), zwischen den Schritten a) und b), während oder nach dem Schritt b) zur Ausbildung von Siliziumoxid (SiO¶2¶) oxidierend behandelt ...

Verfahren zur Herstellung von keramischen Werkstoffen auf Basis von Siliciumcarbid

Verfahren zur Herstellung von Körpern aus keramischen Werkstoffen auf Basis von Siliciumcarbid, umfassend die Schritte: Anordnen von mit Fasern verstärkten porösen Körpern (1, 5) aus Kohlenstoff auf einer gegenüber flüssigem Silicium inerten Unterlage (2), wobei die Körper von außen zugängliche Hohlräume (3) oder oberflächliche Ausnehmungen (3') aufweisen und wobei die Hohlräume (3) in den porösen Körpern nach unten hin verschlossen sind oder die oberflächlichen Ausnehmungen (3') mit der Unterlage (2) ein nach unten hin abgeschlossenes Reservoir bilden, Erwärmen der Anordnung durch Eintrag von Energie zum Aufschmelzen des in dem Reservoir befindlichen Siliciums (6) und Infiltrieren des geschmolzenen Siliciums in die Körper (1, 5) und Reaktion des Siliciums mit dem Kohlenstoff zu Siliciumcarbid, und Verwendung von so hergestellten Körpern als Bremsscheiben und als Kupplungsmitnehmerscheiben.

Vorrichtung zur Silicierung von kohlenstoffhaltigen Werkstoffen und darin durchführbares Verfahren

Vorrichtung zur Behandlung von Werkstücken aus porösem Kohlenstoff-Material mit flüssigem Silicium unter Bildung von Siliciumcarbid, bestehend aus mindestens vier Kammern (O1, O2, O3 und O4), die getrennt voneinander heizbar, kühlbar, evakuierbar und mit Gasen spülbar sind, und die durch Schleusen miteinander verbunden sind, wobei – eine erste Kammer (O1) vorgesehen ist zum Aufheizen der Werkstücke aus porösem Kohlenstoff-Material unter Inertgas auf eine gewählte Betriebstemperatur TB1, – eine zweite Kammer (O2) enthaltend eine Silicierungsvorrichtung (27) vorgesehen ist zum Tränken der porösen Kohlenstoff-Werkstücke mit flüssigem Silicium bei einem Betriebsdruck pB2 und einer Betriebstemperatur TB2, – eine dritte Kammer (O3) vorgesehen ist zur Nachreaktion des in den Poren des Werkstücks (96) befindlichen Siliciums in dem Werkstück bei einer Temperatur TB3, die größer als die oder gleich der Temperatur TB2 ist, unter Bildung von Siliciumcarbid aus Kohlenstoff und Silicium, und – eine vierte ...

Keramische Werkstoffe enthaltend Kohlenstoff-Teilchen mit kugelförmiger Gestalt

Keramische Werkstoffe, deren Matrix mindestens ein Carbid, mindestens ein carbidbildendes Element und Kohlenstoff enthält und die weiter eine disperse Phase enthalten von Kohlenstoff-Teilchen mit kugelförmiger Gestalt und einem mittleren Durchmesser von 0,2 µm bis 800 µm, ein Verfahren zu ihrer Herstellung und ihre Verwendung zur thermischen Isolierung, als Schutzschicht in keramischen Panzerungen gegen mechanische Einwirkung oder als Reibschicht in Bremsscheiben oder Kupplungsscheiben.

REIB- ODER GLEITKÖRPER AUS MIT FASERBÜNDELN VERSTÄRKTEN VERBUNDWERKSTOFFEN MIT KERAMISCHER MATRIX

Verwendung von Elementen aus einem mit Fasern verstärkten Verbundwerkstoff mit keramischer Matrix

Diese Erfindung betrifft die Verwendung von Elementen aus einem mit Fasern verstärkten Verbundwerkstoff mit keramischer Matrix, die mindestens 10 Gewichtsprozent Siliziumcarbid beinhaltet, wobei der Anteil der Kohlenstoff- und/oder Graphitfasern an der Masse der Fasern mindestens 5 Gewichtsprozent beträgt, zur teilweisen oder vollständigen Absorption mindestens einer stoßartigen, punktuellen Belastung, dessen Abmessungen in einer Richtung senkrecht zur Richtung der Belastung mindestens 3 cm beträgt. Die Dicke der verwendeten Elemente aus dem faserverstärkten Verbundwerkstoff kann insbesondere in erfindungsgemäßen Verbunden reduziert werden, bei denen die Elemente eine rückwärtige Verstärkung aufweisen (Backing), die zumeist aufgeklebt wird. DOLLAR A Insbesondere werden die erfindungsgemäßen Elemente und Verbunde als Strukturbauteile verwendet. Sie dienen hier zur Panzerung u. a. im Fahrzeugbau sowohl ziviler wie auch militärischer Art. Auch die Panzerung von feststehenden Objekten ist mit ...

Formkörper aus faserverstärkten keramischen Verbundwerkstoffen, Verfahren zu deren Herstellung und seine Verwendung

Formkörper aus faserverstärkten keramischen Verbundwerkstoffen enthaltend Faserbündel, -kabel oder -stränge von Langfasern, mit mindestens einer zusätzlichen Deckschicht, dadurch gekennzeichnet, dass die Langfaserbündel, -kabel oder -stränge vollständig von einer kurzfaserverstärkten Matrix umhüllt sind, daß die Langfasern einen mittleren Durchmesser von 4 μm bis 12 μm und eine mittlere Länge von mindestens 50 mm, und die Kurzfasern einen mittleren Durchmesser von 4 μm bis 12 μm und eine mittlere Länge von höchstens 40 mm haben, und wobei die Deckschicht aus C/SiC mit einem höheren SiC-Gehalt als die Kernzone besteht.

Ceramic materials containing spherical shaped carbon particles

Ceramic materials with a matrix which contains at least one carbide, at least one carbide-forming element and carbon, and which furthermore contain a dispersed phase of carbon particles with spherical shape and an average diameter of 0.2 mum to 800 mum, a process for their production and their use for thermal insulation, as a protective layer in ceramic armoring against mechanical action, or as a friction layer in brake disks or clutch disks.

SCHMELZINFILTRIERTE FASERVERSTÄRKTE VERBUNDKERAMIK

Verfahren zur Herstellung von Reibscheiben aus keramischen Werkstoffen mit verbesserter Reibschicht

Verfahren zur Herstellung von Reibscheiben aus keramischen Werkstoffen mit mindestens einer Reibschicht, deren Matrix Siliciumcarbid, Silicium und Kohlenstoff enthält, wobei im ersten Schritt eine Mischung von feinteiligem Silicium und/oder feinen Teilchen von anderen carbidbildenden Elementen mit mindestens einer weiteren Komponente ausgewählt aus einem Harz in partikulärer Form und einem Bindemittel, ausgewählt aus Kunstharzen, Pechen und Mischungen von diesen, bereitet wird, im zweiten Schritt die Mischung entlüftet und bei erhöhter Temperatur von bis zu 280°C zu einer zylindrischen oder zylinderringförmigen Scheibe verpreßt und gehärtet wird, im dritten Schritt die gehärtete Scheibe durch Erhitzen unter Ausschluß von oxydierenden Agenzien auf eine Temperatur von ca. 750°C bis ca. 1300°C behandelt wird, wobei die Bindemittel sich unter Bildung eines Kohlenstoffrückstands zersetzen, und ein poröser Kohlenstoffkörper zurückbleibt, im vierten Schritt der poröse Kohlenstoffkörper bis über ...

Friktionsbelastbare Scheiben aus faservertärkter Keramik

Verwendung von polymergebundenen Fasergelegen enthaltend Fasern aus Kohlenstoff, wobei die polymergebundenen Fasergelege eine mittlere Länge gemessen in Faserrichtung von 3 mm bis 50 mm und eine mittlere Bündeldicke gemessen senkrecht zur Faserrichtung von 0,1 mm bis 10 mm haben, und bei denen mindestens 75% aller polymergebundenen Fasergelege eine Länge aufweisen, die mindestens 90% und nicht mehr als 110% der mittleren Länge beträgt, bei der Herstellung von Carbon-Keramik-Bremsscheiben und Carbon-Keramik-Kupplungsscheiben.

POLYMER-BONDED FIBER AGGLOMERATES, PROCESSES FOR PRODUCING THE SAME, USES OF THE SAME IN PRODUCTION OF FIBER-REINFORCED COMPOSITE MATERIALS

PURPOSE: A polymer-bonded fiber agglomerate, a fiber-reinforced composite material and processes for producing the same are provided, wherein short fiber agglomerates having an adjustable fiber length and a length distribution that is as sharp as possible and can be selected can be produced in a controlled manner. CONSTITUTION: A polymer-bonded fiber agglomerate comprises: short fibers selected from carbon, ceramic materials, glasses, metals and organic polymers; and a polymeric bonding resin selected from synthetic resins and thermoplastic materials, wherein the fiber agglomerate has an average length, which is measured in a fiber direction, of 3 to 50 mm, and an average thickness, which is measured perpendicularly to the fiber direction, of 0.1 to 10 mm, and wherein at least 75% of all contained fibers has a length being 90 to 110% of the fiber agglomerate average length. A process for producing a polymer-bonded fiber agglomerate comprises the steps of: dipping a filament yarn into a ...

Bremssystem mit Verbundwerkstoff-Bremsscheibe

Bremssystem umfassend eine Reibpaarung aus organisch oder anorganisch gebundenen Metall- oder Sintermetallhaltigen und/oder CFC-haltigen Bremsbelägen und eine Bremsscheibe aus faserverstärktem Keramikverbundwerkstoff aus C/SiC, wobei die Bremsscheibe einen Tragkörper und mindestens eine Reibschicht umfasst, dadurch gekennzeichnet, dass die Reibschicht der Bremsscheibe einen SiC-Anteil oberhalb von 70%, einen Si-Gehalt unterhalb von 30% und eine Dicke von mehr als 1 mm besitzt, wobei das restliche Material überwiegend aus Kohlenstoff besteht, und dass die Werkstoff-Zusammensetzungen in Tragkörper und Reibschicht der Bremsscheibe unterschiedlich sind.

Formkörper aus faserverstärkten Verbundwerkstoffen mit segmentierter Deckschicht, seine Herstellung und seine Verwendung

Die vorliegende Erfindung betrifft Formkörper aus faserverstärkten keramischen Verbundwerkstoffen, umfassend eine Kernzone und mindestens eine Deckschicht, die einen höheren thermischen Ausdehnungskoeffizienten als die Kernzone besitzt. Die Deckschicht ist dabei als SiC-reiche Deckschicht und in Segmente eingeteilt, die durch Leerstellen oder Stege aus einem anderen Material als das Material der Segmente von den benachbarten Segmenten getrennt sind. Die Erfindung betrifft auch ein Verfahren zum Herstellen derartiger Formkörper durch Infiltrieren eines Vorkörpers mit schmelzflüssigem Silicium und deren Verwendung für Reibscheiben, im Fahrzeugbau oder als Schutzscheibe.

Reibpaarung für Kupplungssysteme

Reibpaar für Kupplungssysteme aus zwei Materialien, in der eines der Materialien ein faserverstärkter keramischer oder metallischer Werkstoff A ist, der Verstärkungsfasern aus Kohlenstoff oder keramischen Fasern oder Whiskern enthält, und das mit dem Material A in der Reibpaarung zusammenwirkende Material B ausgewählt ist aus keramischen B11 oder metallischen Werkstoffen B12, Sintermetallen B2, gesinterten oxidischen Keramiken B3, gesinterten nitridischen Keramiken B4, gesinterten carbidischen Keramiken B5 und organischen Sintermaterialien B6, Verfahren zu deren Herstellung und ihre Anwendung in Kupplungssystemen.

Production of hollow bodies made from fiber-reinforced ceramic materials, used in brake and clutch disk production, comprises forming cores, forming green body from cores and carbonizing

Production of hollow bodies made from fiber-reinforced ceramic materials comprises forming cores with shape of hollow chambers of hollow bodies; forming green body from cores and pressable mass; reinforcing green body by heating under pressure; and carbonizing with exclusion of air and other oxidizing agents to form carbon reinforced body. Production of hollow bodies made from fiber-reinforced ceramic materials comprises forming cores with a shape of the hollow chambers of the hollow bodies; forming a green body from the cores and a pressable mass; reinforcing green body by heating to 120-280 deg C under pressure; and carbonizing by heating to 750-1100 deg C with the exclusion of air and other oxidizing agents to form a carbon reinforced body. The cores are made from a material which does not melt above the hardening temperature during molding of the pressable mass and a pyrolysis residue.

Verfahren zur Herstellung von Formkörpern aus faserverstärkten keramischen Materialien und deren Verwendung

Friction members made from fiber-reinforced ceramic composite materials and processes for making friction members

Friction members are composed of a ceramic composite material. The friction members can be used for motor vehicles as a clutch disk for friction clutches, for transmitting motive power, or as a brake disk. A friction zone of the friction member is composed of ceramic, in particular of Si and SiC. A core zone of the friction member is made from fiber-reinforced C/SiC, in particular of long fiber woven fabric-reinforced and short fiber-reinforced C/SiC.

Method and Device For Siliconization of Carbon-Containing Materials

Method for treatment of workpieces of porous carbon material with liquid silicon with the formation of silicon carbide, comprising the following steps: preheating of porous carbon workpieces under an inert gas to a selected operating temperature TB1, delivery of liquid silicon to the porous carbon workpieces at an operating pressure pB2 and an operating temperature TB2 and impregnation of the porous carbon workpieces with liquid silicon, reaction of the liquid silicon in the workpiece at a temperature TB3 with formation of silicon carbide from carbon and silicon, gassing of the workpieces with inert gas, and cooling from the operating temperature TB3 to a conditioning temperature Tk, cooling of workpieces to room temperature, in step c the delivery of silicon and transport of the workpieces taking place over preferably cylindrical rolls which are porous at least in the exterior region and which are pivoted, and their speed of rotation determining the residence time for the delivery of silicon ...

Mit Fasern und/oder Faserbündeln verstärkter Verbundwerkstoff mit keramischer Matrix

Die vorliegende Erfindung betrifft einen neuen mit Faserbündeln (20, 21) verstärkten Verbundwerkstoff mit einer keramischen Matrix (24), der Faserbündel (20, 21) beinhaltet, die aus zwei verschiedenen Anteilen (20, 21) bestehen, die eine unterschiedliche mittlere Faserbündellänge (4, 5) aufweisen, wobei diese beiden Faserbündelanteile (2, 3) in der Gesamtfaserbündelverteilung (1) der Masse der Faserbündel (20, 21) des Verbundwerkstoffs bezüglich der Faserbündellänge durch ein Minimum (6) der Faserbündelverteilung (1) getrennt werden. Dieser neue Verbundwerkstoff weist eine gegenüber dem Stand der Technik verbesserte Matrix (24) mit einer möglichst homogenen Phasenzusammensetzung und einer höchstens noch feinen Rißstruktur (23) auf. Außerdem betrifft die Erfindung Verfahren zur Herstellung dieses Verbundwerkstoffes sowie seine Verwendung. The present invention relates to a new composite material reinforced with fiber bundles (20, 21) with a ceramic matrix (24) which contains fiber bundles (20, 21) which consist of two different parts (20, 21) which have a different mean fiber bundle length ( 4, 5), these two fiber bundle portions (2, 3) in the total fiber bundle distribution (1) of the mass of the fiber bundles (20, 21) of the composite material with respect to the fiber bundle length being separated by a minimum (6) of the fiber bundle distribution (1). This new composite material has an improved matrix (24) compared to the prior art with a phase composition that is as homogeneous as possible and a crack structure (23) that is at most fine. The invention also relates to methods for producing this composite material and its use.

Verbunde aus einem mit Fasern verstärkten Verbundwerkstoff mit keramischer Matrix und einem Backing und Verwendung der Verbunde

Reibscheibe und Verfahren zu ihrer Herstellung

Reibscheibe, umfassend mindestens eine zylinderförmige Zone A, die als Tragscheibe kraftschlüssig mit einer Achse zu verbinden ist, und mindestens eine zylinderförmige Ringzone B, dadurch gekennzeichnet, daß die der Tragscheibe abgewandte Seite der Ringzone B radial-trapezförmige und/oder evolventenförmig gekrümmte und/oder ellipsenförmige und/oder kreisförmige und/oder polygonale zum Umfang und/oder zum Zentrum hin offene und/oder geschlossene Ausnehmungen aufweist und daß das Material der Tragscheibe A eine faserverstärkte Keramik ist, daß sie aus einem Teil im Grünzustand vor der Keramisierung geformt ist und daß das Material der Ringtone B ein keramisches Material ist, das gegebenenfalls faserverstärkt ist, wobei das keramische Material der Ringzone B und das Material der Matrix der faserverstärkten Keramik der Tragscheibe A unabhängig voneinander ausgewählt sind aus Silicium, Siliciumcarbid, Siliciumnitrid, Kohlenstoff, Bornitrid, Borcarbid, Si/B/N/C und deren Mischungen, Verfahren ...

Process for producing shaped bodies comprising fiber-reinforced ceramic materials

Process for producing shaped bodies comprising fiber-reinforced ceramic materials, where a green body is produced in a first step by introducing a press moulding composition into a mold, where the press moulding composition comprises carbon fibers and/or carbon filaments and pitch and/or resins which, when treated thermally and with the exclusion of oxidizing agents, form carbon-containing residues, the green body is cured in a second step by heating to a temperature of from 120° C. to 280° C. under pressure, the cured green body, also referred to as intermediate body, is carbonized in a third step by heating in a nonoxidizing atmosphere to a temperature of from about 750° C. to about 1100° C. to form a C/C body, wherein heating in the first, second and/or third step is at least partly effected by an electric current being passed through the pressable composition, the green body and/or the cured green body, shaped bodies produced according to this process and their use as brake disks, clutch ...

Verfahren und Vorrichtung zur Silicierung von kohlenstoffhaltigen Werkstoffen

Verfahren zum Behandeln von Werkstücken aus porösem Kohlenstoff-Material mit flüssigem Silicium unter Bildung von Siliciumcarbid, umfassend die Schritte: Vorheizen von porösen Kohlenstoff-Werkstücken unter Inertgas auf die gewählte Betriebstemperatur TB1, Zuführen von flüssigem Silicium zu den porösen Kohlenstoff-Werkstücken bei einem Betriebsdruck pB2 und einer Betriebstemperatur TB2 und Tränken der porösen Kohlenstoff-Werkstücke mit flüssigem Silicium, Reaktion des flüssigen Siliciums in dem Werkstück bei einer Temperatur TB3 unter Bildung von Siliciumcarbid aus Kohlenstoff und Silicium, Begasen des Werkstücks mit Inertgas und Abkühlen von der Betriebstemperatur TB3 auf die Konditionierungstemperatur Tk, Abkühlen der Werkstücke auf Raumtemperatur, wobei im Schritt c die Zuführung des Siliciums und der Transport der Werkstücke über zumindest im Außenbereich poröse, vorzugsweise zylindrische Rollen erfolgt, die drehbar gelagert sind und deren Drehgeschwindigkeit die Verweilzeit für die ...

Kupplungsbeläge aus faserverstärkten keramischen Werkstoffen

Kupplungsbeläge aus faserverstärkten keramischen Werkstoffen, die Kohlenstoff-Kurzfasern enthalten, und deren Matrix einen Massenanteil von mindestens 40% Siliciumcarbid aufweist, Verfahren zur ihrer Herstellung und Anwendung in Kupplungssystemen insbesondere für Kraftfahrzeuge.

Kupplungsbeläge aus faserverstärkten keramischen Werkstoffen

Kupplungsbeläge aus faserverstärkten keramischen Werkstoffen, die Kohlenstoff-Kurzfasern enthalten, und deren Matrix einen Massenanteil von mindestens 40 % Siliciumcarbid aufweist, wobei der Mittelwert der Projektion der Länge der Kohlenstoff-Kurzfasern auf die Normale der größten Fläche der Kupplungsbeläge 10 % bis 95 % der Dicke der Beläge beträgt.

Production of hollow bodies made from fiber-reinforced ceramic materials used in the production of brake and clutch disks comprises forming cores, forming a green body

Production of hollow bodies made from fiber-reinforced ceramic materials comprises forming cores having the shape of the hollow chambers of the hollow bodies; forming a green body from the cores and a pressable mass; reinforcing the green body by heating to 120-280 deg C under pressure; and carbonizing by heating to 750-1100 deg C with the exclusion of air and other oxidizing agents to form a C/C body. The cores are made from a material which melts at a temperature lying above the hardening temperature during molding of the pressable mass. Preferred Features: The pressable mass is made from coal tar pitch, crude oil pitch and/or resins selected from phenol resins, epoxy resins, polyimides and filler-containing mixtures with furfuryl alcohol and furan resins. The cores are made from a filler-containing thermoplastic polymer or a foamed thermoplastic.

Bremsscheibe mit Zwischenschicht

Carbon-Keramik-Bremsscheiben, die mehrere Schichten umfassen, wobei mindestens eine Schicht als Tragkörper dient und mindestens eine Schicht als Reibschicht fungiert, wobei der Tragkörper und mindestens eine Reibschicht durch eine Zwischenschicht getrennt sind, dadurch gekennzeichnet, daß die Zwischenschicht Verstärkungsfasern in Form von Faserbündeln aufweist, wobei die Faserbündel von einer Schicht aus einer Mischung von Siliciumcarbid, Silicium und Kohlenstoff umgeben sind, die durch thermische Behandlung einer Mischung aus Silicium-Pulver und einem carbonisierten Harz oder carbonisierten Pech bei einer Temperatur von 900 DEG C bis 1700 DEG C unter Ausschluß von Oxidationsmitteln erhältlich ist, Verfahren zu deren Herstellung, und Verwendung insbesondere in Bremssystemen von Automobilen.

Ceramic dewatering element formed in one piece, useful for a machine for producing a fibrous web, preferably a paper-, cardboard- or packaging paper web, comprises a ceramic carrier and a support for the ceramic carrier

Ceramic dewatering element comprises a ceramic carrier and a support for the ceramic carrier. The dewatering element is formed in one piece. An independent claim is also included for manufacturing the ceramic dewatering element, comprising (i) providing at least one elongated preform made of a carbon composite material, which forms a bounded chamber, (b) connecting at least two preforms (when at least two elongated preforms are used) through at least one connecting surface to form a composite, in which a connecting mass comprising silicon carbide and at least one polymer adhesive, is provided between the connecting surfaces of the preforms and then cured, and (c) siliconizing the preform and/or the composite to obtain the dewatering element.

METHOD FOR PRODUCING A CERAMIC COMPONENT COMPOSED OF A PLURALITY OF JOINED PREFORMS AND COMPONENT OBTAINED BY THE METHOD

A method for producing a component includes a) providing at least two preforms each made of a carbon composite material, b) joining the at least two preforms at least at one respective connecting surface to form a composite, in which a joining compound is introduced between the joining surfaces of the preforms and then cured and the joining compound contains silicon carbide and at least one polymer adhesive, and c) siliconizing the composite to form the component. A component, such as an optical component produced thereby, is also provided. 14-. (canceled)5. A method for manufacturing a component , the method comprising the following steps:a) providing each of at least two preforms from a carbon composite material;b) providing a joining compound containing silicon carbide and at least one polymer adhesive and connecting the at least two preforms at least at one joining surface of each of the at least two preforms to form a composite by introducing the joining compound between the joining surfaces of the at least two preforms and then curing the joining compound; andc) siliconizing the composite to produce the component.6. The method according to claim 5 , wherein the component is a ceramic component.7. The method according to claim 5 , which further comprises carrying out step b) by applying the joining compound to a joining surface of a preform to coat the joining surface claim 5 , pressing the coated joining surface against the joining surface of another preform claim 5 , and then curing the joining compound claim 5 ,8. The method according to claim 5 , which further comprises carrying out step b) by aligning the at least two preforms to be connected relative to each other to form a bonding gap between the joining surfaces claim 5 , then filling the bonding gap with the joining compound claim 5 , and then curing the joining compound.9. The method according to claim 8 , which further comprises carrying out the step of aligning the at least two preforms with a ...

Manufacturing tool comprises mixing crushed carbon fibers with organic binder, forming shaped body, where cutting edges are defined in forming step, carbonizing shaped body, optionally graphitizing shaped body, and the siliconizing body

The method comprises mixing 65-75 wt.% of crushed carbon fibers with 25-35 wt.% of an organic binder, forming a shaped body, where cutting edges (17', 17'') are defined in the forming step, carbonizing the shaped body, optionally graphitizing the carbonized shaped body, and siliconizing the shaped body. The crushed carbon fibers have average length of more than 10 mu m, include cellulose fibers, and are made of a carbon-precursor material. The method further comprise pressing the shaped body. An independent claim is included for a tool.

Kupplungsbeläge aus faserverstärkten keramischen Werkstoffen

Kupplungsbeläge aus faserverstärkten keramischen Werkstoffen, die Fasern aus Kohlenstoff enthalten, und deren Matrixmaterial ausgewählt ist aus anorganischen Polymeren, oxidischen Keramiken, abgebundenen Zementen, elementorganischen Polymeren und anorganischen dispersen Feststoffen, die durch einen anorganischen oder organischen Binder zusammengehalten sind, wobei die anorganischen dispersen Feststoffe ausgewählt sind aus Siliciumdioxid, Siliciumnitrid, Aluminiumoxid, Titandioxid, Titancarbid, Wolframcarbid, Silicaten und Titanaten.

Keramisches Bauteil

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines dreidimensionalen, keramischen Bauteils enthaltend Siliziumkarbid umfassend die folgenden Schritte: a) Bereitstellen einer pulverförmigen Zusammensetzung mit einer Körnung (d50) zwischen 3 µm und 500 µm umfassend zumindest 50 Gew.-% Koks, b) Bereitstellen eines flüssigen Binders, c) flächiges Ablegen einer Lage aus dem in a) bereitgestellten Material und lokales Ablegen von Tröpfchen des in b) bereitgestellten Materials auf diese Lage und Wiederholen des Schrittes c), wobei das lokale Ablegen der Tröpfchen in den jeweils nachfolgenden Wiederholungen dieses Schrittes entsprechend der gewünschten Form des herzustellenden Bauteils angepasst wird, d) zumindest teilweises Aushärten oder Trocknen des Binders und Erhalt eines die gewünschte Form des Bauteils aufweisenden Grünkörpers, e) Carbonisieren des Grünkörpers und f) Silizieren des carbonisierten Grünkörpers durch Infiltration mit flüssigem Silizium, wobei sich der Grünkörper ...

Method for producing brake discs formed of ceramic parts with metal hubs and brake disc produced according to the method

A method for the production of brake discs having friction areas made of ceramic materials, in particular composite materials, includes placing at least one ceramic portion in a diecasting mold and joining the ceramic portion with molten metals by casting under pressure into a rotationally symmetrical body which contains at least one ceramic (composite) segment that is disposed symmetrically relative to the axis of rotation of the metal body and juts out over at least one surface of the metal body perpendicular to the axis. A brake disc produced according to the method is also provided.

Preform for producing molded part such as friction washer, comprises two scrim layers that are arranged and impregnated with matrix, where two scrim layers are made of carbon fiber roving and/or silicon carbide fiber roving

The preform comprises two scrim layers that are arranged on top of each other and impregnated with matrix, where the two scrim layers are made of carbon fiber roving and/or silicon carbide fiber roving. The preform is made of fiber-reinforced composite material. One of the two scrim layers is sewed with other of the two scrim layers. The carbon fiber roving and/or the silicon carbide fiber roving of one of the two scrim layers is angularly transferred to the other carbon fiber roving and/or the silicon carbide fiber roving of the scrim layer. The matrix is made of carbon. The preform comprises two scrim layers that are arranged on top of each other and impregnated with matrix, where the two scrim layers are made of carbon fiber roving and/or silicon carbide fiber roving. The preform is made of fiber-reinforced composite material. One of the two scrim layers is sewed with other of the two scrim layers. The carbon fiber roving and/or the silicon carbide fiber roving of one of the two scrim ...

MANUFACTURE OF SHAPED BODY FROM CARBON FIBRE REINFORCED CARBON

PROBLEM TO BE SOLVED: To manufacture a formed body from a carbon matrix containing a reinforcing material comprising a carbon fiber, in which the reinforcing material having prescribed size is formed from the carbon fiber bundles and when mixed in a forming material, bonding of the fibers in the bundle and a parallel spacial arrangement are maintained. SOLUTION: The fiber bundle bonded by a binder to be shape-stably cured and to be carbonizable, prepared from parallel arranged carbon fibers and having a prescribed length, width and thickness is manufactured. The forming material is manufactured by mixing the fiber bundles, a carbonizable matrix forming agent and a selective auxiliary material with one another, and a near net shape base material is manufactured by raising a temperature, pressing the forming material in a near net shape forming mold to cure the carbonizable matrix forming agent and successively performing releasing from the mold, and the base material is carbonized to form ...

Werkstoff, Verfahren zur Herstellung eines Werkstoffs und seine Verwendung

Die vorliegende Erfindung betrifft einen Werkstoff, der eine Matrix (3, 23) und mindestens ein darin eingebrachtes Verstärkungselement (5, 25) umfasst, wobei die Matrix (3, 23) ausgewählt ist aus der Gruppe, bestehend aus Kunststoff, Kohlenstoff, Keramik, Glas, Ton, Metall und deren Kombinationen, und das Verstärkungselement (5, 25) eine kugel- bis ellipsoidförmige Gestalt aufweist und zwiebelschalenartig aufgebaut ist. Weiterhin betrifft die vorliegende Erfindung ein Verfahren zur Herstellung eines Werkstoffs, umfassend die Schritte a) Bereitstellen von mindestens einem Verstärkungselement (5, 25) von kugel- bis ellipsoidförmiger Gestalt, das zwiebelschalenartig aufgebaut ist, und b) Einbringen des Verstärkungselements (5, 25) in eine Matrix (3, 23), wobei die Matrix (3, 23) ausgewählt ist aus der Gruppe, bestehend aus Kunststoff, Kohlenstoff, Keramik, Glas, Ton, Metall und deren Kombinationen. Ferner betrifft die vorliegende Erfindung die Verwendung des Werkstoffs als Friktionsanwendung ...

CERAMIC COMPONENT

A ceramic component, wherein the component contains 20 to 60 wt.% SiC, 5 to 40 wt.% free silicon and 10 to 65 wt.% free carbon. The disclosure also relates to the use of the component. The method for producing the ceramic component includes the following steps: a) providing a green body based on carbon, which has been produced by means of a 3D-printing method, b) impregnating the green body with a solution selected from the group consisting of a sugar solution, a starch solution or a cellulose solution, or a resin system including a mixture containing at least one resin, at least one solvent and at least one curing agent, wherein the at least one resin and the at least one solvent are different, c) drying or curing the impregnated green body. 115-. (canceled)16. A ceramic component containing silicon carbide (SiC) obtainable by a method comprising the following steps:a) providing a green body based on carbon, which has been produced by means of a 3D-printing method,b) impregnating the green body with a solution selected from the group consisting of a sugar solution, a starch solution or a cellulose solution, or a resin system comprising a mixture containing at least one resin, at least one solvent and at least one curing agent, wherein the at least one resin and the at least one solvent are different,c) drying or curing the impregnated green body,d) carbonising the dried or cured green body, wherein a fine-pored, foam-like carbon skeleton is formed from the dried solution or a fine-pored, sponge-like carbon skeleton is formed from the cured resin system,e) siliconising the carbonised green body by infiltration with liquid silicon.17. The ceramic component according to claim 16 , wherein the green body according to step a) has been produced using coke.18. The ceramic component according to claim 16 , wherein the green body according to step a) contains SiC in addition to carbon.19. The ceramic component according to claim 16 , wherein the at least one resin in step b ...

METHOD FOR PRODUCING A CERAMIC SUBSTANCE FOR A CERAMIC MATERIAL

A method for producing a ceramic substance includes producing a homogeneous mixture containing carbon fibers having a fiber length distribution of D=<15 μm and at least one powdery and carbonizable binder. The homogeneous mixture is compacted under the action of pressure. The compacted homogeneous mixture is thermally treating for carbonizing, or for carbonizing and graphitizing, to obtain a carbon substance. The carbon substance is siliconized to obtain a ceramic substance. 1. A method for producing a ceramic substance , which comprises the following steps of:{'sub': '50', 'producing a homogeneous mixture containing carbon fibers having a fiber length distribution D<15 μm and at least one powdery and carbonizable binder;'}compacting the homogeneous mixture under an action of pressure resulting in a compacted homogeneous mixture;thermally treating to at least one of carbonize or carbonize and graphitize, the compacted homogeneous mixture to obtain a carbon substance; andsiliconizing the carbon substance to obtain the ceramic substance.2. The method according to claim 1 , wherein the carbon fibers have the fiber length distribution of D<30 μm.3. The method according to claim 1 , wherein the powdery and carbonizable binder contains a powdery resin.4. The method according to claim 1 , wherein the powdery and carbonizable binder has a particle size distribution D<100 μm.5. The method according to claim 1 , which further comprises selecting at least one of a mixing ratio in the homogeneous mixture claim 1 , the pressure during the compacting step claim 1 , or a temperature during the thermal treatment claim 1 , such that the carbon substance has a density in a range of approximately 0.5 g/cmto approximately 0.85 g/cm.6. The method according to claim 1 , which further comprises forming a density of the ceramic substance in a range from approximately 2.8 g/cmto approximately 3.1 g/cmduring siliconization.7. The method according to claim 1 , wherein the homogeneous mixture ...

METHOD FOR PRODUCING A COMPONENT AND COMPONENT PRODUCED BY THE METHOD

A method for producing a component and to a component as such made of a ceramic material having a predefined shape. The method includes providing a plurality of sheets made of carbon material), providing an adhesive containing a carbonizable component and joining the plurality of sheets to each other by the adhesive to form a sheet arrangement. The spatial dimensions of which are such that the predefined shape of the component can be generated from the arrangement by material removal. The sheet arrangement is worked by removing carbon material from the sheet arrangement to obtain a preform which is made of carbon material and has the predefined shape of the component to be produced. The perform is siliconized to obtain the component made of ceramic material. 1. A method for producing a component made of a ceramic material having a predefined shape , which method comprises the steps of:providing a plurality of sheets made of a carbon material;providing an adhesive containing a carbonizable element and joining the plurality of sheets to each other by means of the adhesive to form a sheet configuration, spatial dimensions of the sheet configuration being such that the predefined shape of the component can be generated from the sheet configuration by material removal;working the sheet configuration by removing the carbon material from the sheet configuration for obtaining a preform made of the carbon material and having the predefined shape of the component to be produced; andsiliconizing the preform to obtain the component made of the ceramic material.2. The method according to claim 1 , which further comprises forming the sheet configuration by stacking on top of one another or joining to each other at least some of the sheets claim 1 , or all of the sheets claim 1 , by joining an underside of a sheet or subsequent sheet as a first joining face to an upper side of another sheet as a second joining face.3. The method according to claim 1 , wherein the sheets have side ...

METHOD FOR PROTECTING HEAT EXCHANGER PIPES IN STEAM BOILER SYSTEMS, MOULDED BODY, HEAT EXCHANGER PIPE AND STEAM BOILER SYSTEM

In order to protect heat exchanger pipes () in steam boiler systems, special casing elements () made of fiber-reinforced ceramic are proposed. The casing elements prevent or reduce the formation of films and corrosion on the heat exchanger pipes and thus enable higher steam parameters of the boiler system and a correspondingly increased thermal efficiency. 1. A method for protecting heat exchanger pipes in steam boiler systems , wherein heat exchanger pipes of the steam boiler system are surrounded at least partially with ceramic.2. The method according to claim 1 , wherein the ceramic is fiber-reinforced.3. The method according to claim 1 , wherein the ceramic is formed at least partially from silicon carbide.4. The method according to claim 3 , wherein the ceramic is formed at least partially by silicization of a graphite film or carbon film claim 3 , especially a film made of expanded graphite.51. The method according to claim 1 , wherein the ceramic is disposed so as to be displaceable relative to the heat exchanger pipe ().6. The method according to claim 1 , wherein the ceramic is disposed in the form of a plurality of casing elements lying adjacent to one another.7. The method according to claim 1 , wherein the casing elements are formed by circular-segment shells.8. The method according to claim 4 , wherein the circular-segment shells are connected to one another axially and/or radially in a form-fit manner.9. The method according to claim 1 , wherein the ceramic comprises carbon fibers.10. The method according to claim 1 , wherein the ceramic is exposed to temperatures of over 400° C.11. The method according to claim 1 , wherein the heat exchanger pipes are exposed at their inner side to a pressure of over 40 bar.12. The method according to claim 1 , wherein the ceramic has a thickness between the internal diameter and external diameter of less than 10 millimeters and preferably less than 5 millimeters.13. The method according to claim 1 , wherein the ...

DEFENSIVE, CERAMIC BASED, APPLIQUE ARMOR, DEVICE FOR PROVIDING ANTI-PROJECTILE ARMORING PROTECTION AND PROCESS FOR PRODUCING CERAMIC BASED PROJECTILE ARMOR WITH HOLLOW GEOMETRY

A device and process of forming a defensive, ceramic based, applique armor for covering and protecting a substrate which may be exposed to attack by projectiles, the applique armor having a flat or curved armor plate formed of ceramic material and having a first surface and a second surface; wherein the ceramic material being formed of silicon carbide with carbon fibers (C/SiC) and the ceramic material has a plurality of holes on at least one of the surfaces; the holes having a diameter smaller than an anticipated bullet or ammunition projectile and the holes being set obliquely relative to at least one surface, whereby the device and process provide holes formed by press molding, boring, drilling, or combinations thereof. 1. A defensive , ceramic based , applique armor for covering and protecting a substrate which may be exposed to attack by projectiles , the applique armor comprising:a flat or curved armor plate formed of ceramic material and having a first surface and a second surface;said ceramic material being formed of silicon carbide with carbon fibers (C/SiC);said ceramic material having a plurality of holes on at least one of said surfaces;said holes having a diameter smaller than an anticipated bullet or ammunition projectile;said holes being set obliquely relative to said at least one surface; andsaid holes formed by press molding, boring, drilling, or combinations thereof.2. The defensive ceramic based armor of claim 1 , which further comprises a thin skin layer or multiple layers increasing a maintainability or protecting ability of the applique armor.3. The defensive ceramic based armor of claim 1 , wherein the ceramic based armor is constructed and configured for covering a substrate and for inhibiting an intrusion of ammunition and ammunition based projectiles.4. The defensive ceramic based armor of claim 2 , wherein said thin skin layer is positioned externally claim 2 , internally claim 2 , or internally and externally to the armor.5. A device for ...

Friction discs having a structured ceramic friction layer and method of manufacturing the friction discs

A cylindrical ring-shaped friction disc contains a support body, at least one friction layer, and in each case an intermediate layer arranged between the support body and the friction layer. The intermediate layer has mutually adjoining flat regions with different coefficients of thermal expansion. A method teaches how to produce such a friction disc, and to the use the friction disc as parts of brake and clutch systems, in particular for motor vehicles.

METHOD FOR PRODUCING A CERAMIC COMPONENT COMPOSED OF A PLURALITY OF JOINED PREFORMS AND COMPONENT OBTAINED BY THE METHOD

A method for producing a component includes a) providing at least two preforms each made of a carbon composite material, b) joining the at least two preforms at least at one respective connecting surface to form a composite, in which a joining compound is introduced between the joining surfaces of the preforms and then cured and the joining compound contains silicon carbide and at least one polymer adhesive, and c) siliconizing the composite to form the component. A component, such as an optical component produced thereby, is also provided. 1. A method for manufacturing a component , the method comprising the following steps:a) providing each of at least two preforms from a carbon composite material;b) providing a joining compound containing silicon carbide and at least one polymer adhesive and connecting the at least two preforms at least at one joining surface of each of the at least two preforms to form a composite by introducing the joining compound between the joining surfaces of the at least two preforms and then curing the joining compound; andc) siliconizing the composite to produce the component.2. The method according to claim 1 , wherein the component is a ceramic component.3. The method according to claim 1 , which further comprises carrying out step b) by applying the joining compound to a joining surface of a preform to coat the joining surface claim 1 , pressing the coated joining surface against the joining surface of another preform claim 1 , and then curing the joining compound claim 1 ,4. The method according to claim 1 , which further comprises carrying out step b) by aligning the at least two preforms to be connected relative to each other to form a bonding gap between the joining surfaces claim 1 , then filling the bonding gap with the joining compound claim 1 , and then curing the joining compound.5. The method according to claim 4 , which further comprises carrying out the step of aligning the at least two preforms with a joining device.6. ...

PROCESS FOR PRODUCING SHAPED BODIES OF CARBON FIBER REINFORCED CARBON

A process is provided for producing shaped bodies including carbon fiber reinforced carbon in which the fibers are present in the form of bundles having a defined length, width and thickness. The defined configuration of the fibers in the bundles allows a targeted configuration of the reinforcing fibers in the carbon matrix and thus a structure of the reinforcement which matches the stress of shaped bodies including carbon fiber reinforced carbon, for example brake disks. 1. A process for producing shaped bodies having a carbon matrix reinforced with carbon fiber bundles , the process comprising the following steps:producing or providing bundles of parallel carbon fibers held together by a dimensionally stable cured, carbonizable binder, with the bundles having a specifically set, defined uniform length, width and thickness;producing a molding composition by mixing the fiber bundles, a carbonizable matrix former and optional auxiliaries;producing a green body being close to a final shape by pressing the molding composition in a mold being close to the final shape at elevated temperature with curing of the carbonizable matrix former, and subsequent demolding;carbonizing the green body to form a carbonized shaped body;mechanically re-working the carbonized shaped body, if necessary; anddensifying the carbonized shaped body by deposition of a carbon matrix in a chemical vapor infiltration (CVI) process.2. The process according to claim 1 , which further comprises:carbonizing the binder in the fiber bundles produced or provided in the step of producing or providing bundles of parallel carbon fibers; andre-impregnating the fiber bundles with a carbonizable matrix former in a mechanically generated fluidized bed before the step of producing the molding composition.3. The process according to claim 1 , wherein the production of the fiber bundles includes the following steps:impregnating at least one roving, including a plurality of parallel carbon fiber filaments, with a ...

METHOD FOR PRODUCING A POLYSILANE, POLYSILANE, AND SILICON CARBIDE PRODUCED THEREFROM

A method for producing a polysilane includes a step of reacting (i) at least two silane monomers and (ii) at least one alkali metal. The silane monomers contain the following structural units: at least one aryl group, at least one alkyl group, at least one alkenyl group, and at least three halogen atoms. At least three of the halogen atoms are bonded to a silicon atom of one of the silane monomers. 1. A method for producing a polysilane , the method comprising:reacting (i) at least two silane monomers and (ii) at least one alkali metal, the silane monomers containing the following structural units:at least one aryl group;at least one alkyl group;at least one alkenyl group; andat least three halogen atoms, wherein at least three of the halogen atoms attach to a silicon atom of one of the silane monomers.2. The method according to claim 1 , wherein the at least one aryl group is a Caryl group.3. The method according to claim 2 , wherein the at least one aryl group is selected from the group consisting of a Caryl group claim 2 , a Caryl group claim 2 , a Caryl group claim 2 , a Caryl group claim 2 , and a phenyl group.4. The method according to claim 1 , wherein the at least one alkyl group is a Calkyl group.5. The method according to claim 4 , wherein the at least one alkyl group is selected from the group consisting of a Calkyl group claim 4 , a Calkyl group claim 4 , a Calkyl group claim 4 , a Calkyl group claim 4 , a Calkyl group claim 4 , a Calkyl group claim 4 , and a methyl group.6. The method according to claim 1 , wherein the at least one alkenyl group is a Calkenyl group.7. The method according to claim 6 , wherein the at least one alkenyl group is selected from the group consisting of a Calkenyl group claim 6 , a Calkenyl group claim 6 , a Calkenyl group claim 6 , a Calkenyl group claim 6 , and a vinyl group.8. The method according to claim 1 , wherein the at least three halogen atoms are each chlorine.9. The method according to claim 1 , wherein at least ...

FIBER-REINFORCED SILICON CARBIDE COMPOSITE MATERIALS, METHOD FOR PRODUCING THE FIBER-REINFORCED SILICON CARBIDE COMPOSITE MATERIALS, AND USES OF THE FIBER-REINFORCED SILICON CARBIDE COMPOSITE MATERIALS

Silicon carbide composite materials contain CSiC with a density of 2.95 to 3.05 g/cmand a fiber bundle content of 2 to 10 wt. %. The fiber bundles have a length of 6 to 20 mm, a width of 0.2 to 3 mm, and a thickness of 0.1 to 0.8 mm. The fiber bundles are filled with a cured phenolic resin content of up to 45 wt. %, and the protected fiber bundles are integrated into an SiC matrix. A method produces the silicon carbide composite materials. 1. A silicon carbide composite material having a density from 2.95 to 3.05 g/cm , comprising:a SiC matrix; andstarting materials including fiber bundles impregnated with phenolic resin with a proportion of 0.5 to 10% by weight relative to a total weight of said starting materials used for a manufacture of green bodies, said fiber bundles having a length of 6 to 20 mm, a width of 0.2 to 3 mm and a thickness of 0.1 to 0.8 mm, and said fiber bundles used for manufacture of said green bodies contain a proportion of cured phenolic resin of up to 45% by weight.2. The silicon carbide composite materials according to claim 1 , wherein said fiber bundles have said length of 8 to 12 mm claim 1 , said width of 0.5 to 2 mm and said thickness of 0.2 to 0.7 mm.3. The silicon carbide composite materials according to claim 1 , wherein said fiber bundles have said length of 8 to 12 mm claim 1 , said width of 0.5 to 1 mm and said thickness of 0.2 to 0.5 mm.4. The silicon carbide composite materials according to claim 1 , wherein said SiC matrix contains:a SiC powder with a granularity of F150 and/or F360;a carbonized cellulose fiber; andat least one further raw material selected from the group consisting of acetylene coke, charcoal, a phenolic resin in liquid form and a phenolic resin in powder form.5. A method for producing silicon carbide composite materials claim 1 , which comprises the steps of:a) mixing/blending resin and fiber bundles impregnated with a phenolic resin and cured and containing a proportion of the phenolic resin of up to 45% by ...

Ceramic component

A ceramic component containing silicon carbide and to the use of the component. The method for producing the ceramic component includes the following steps: a) providing a green body based on SiC, which has been produced by means of a 3D-printing method, b) impregnating the green body with a solution selected from the group consisting of a sugar solution, a starch solution or a cellulose solution, or a resin system comprising a mixture containing at least one resin, at least one solvent and at least one curing agent, the at least one resin and the at least one solvent being different, c) drying or curing the impregnated green body, d) carbonising the dried or cured green body, wherein a fine-pored, foam-like carbon skeleton is produced from the dried solution or a fine-pored, sponge-like carbon skeleton is produced from the cured resin system.

Brake system having a composite-material brake disc

A brake system includes a friction coupling having organically or inorganically bound metal-containing, sintered-metal-containing and/or CFC-containing brake linings and a brake disc of fiber-reinforced C/SiC ceramic composite material. A friction layer and/or a surface of the brake disc subject to friction has a proportion of SiC greater than 65% and material compositions in a core region and a surface region of the brake disc are different. The brake system may be used in motor vehicles, rail vehicles or aircraft.

Process of manufacture of fiber-reinforced shaped bodies

Carbon fibre reinforced carbon bodies and a method for their production

Process for producing hollow bodies comprising fiber-reinforced ceramic materials

Process for producing hollow bodies comprising fiber-reinforced ceramic materials, where mold cores whose shape corresponds to that of the hollow spaces are produced in a first step, at least one mold core together with a press moulding composition or formable fiber composition are introduced into a mold, where the press moulding composition comprises carbon fibers and/or carbon filaments and thermally curable carbonizable binders, in such a way that the position of the cores corresponds to the desired position of the hollow spaces to be formed in a second step, the composition is cured in a third step by heating to a temperature of from 120° C. to 280° C., to give a green body, the strengthened green body is carbonized and or graphitized in a fourth step by heating in a nonoxidizing atmosphere to a temperature of from about 750° C. to about 2400° C. to form a C/C body, wherein heating in the third and/or fourth step is at least partly effected by an electric current being passed through the pressable composition or the green body and through at least one mold core, hollow bodies produced in this way and their use for producing clutch disks or brake disks, in particular for automobiles

Process for producing shaped bodies comprising fiber-reinforced ceramic materials

Process for producing shaped bodies comprising fiber-reinforced ceramic materials, where a green body is produced in a first step by introducing a press moulding composition into a mold, where the press moulding composition comprises carbon fibers and/or carbon filaments and pitch and/or resins which, when treated thermally and with the exclusion of oxidizing agents, form carbon-containing residues, the green body is cured in a second step by heating to a temperature of from 120° C. to 280° C. under pressure, the cured green body, also referred to as intermediate body, is carbonized in a third step by heating in a nonoxidizing atmosphere to a temperature of from about 750° C. to about 1100° C. to form a C/C body, wherein heating in the first, second and/or third step is at least partly effected by an electric current being passed through the pressable composition, the green body and/or the cured green body, shaped bodies produced according to this process and their use as brake disks, clutch disks and friction disks

Process for producing hollow bodies comprising fiber-reinforced ceramic materials

Process for producing hollow bodies comprising fiber-reinforced ceramic materials, where mold cores whose shape corresponds to that of the hollow spaces are produced in a first step, at least one mold core together with a press moulding composition or formable fiber composition are introduced into a mold, where the press moulding composition comprises carbon fibers and/or carbon filaments and thermally curable carbonizable binders, in such a way that the position of the cores corresponds to the desired position of the hollow spaces to be formed in a second step, the composition is cured in a third step by heating to a temperature of from 120° C. to 280° C., to give a green body, the strengthened green body is carbonized and or graphitized in a fourth step by heating in a nonoxidizing atmosphere to a temperature of from about 750° C. to about 2400° C. to form a C/C body, wherein heating in the third and/or fourth step is at least partly effected by an electric current being passed through the pressable composition or the green body and through at least one mold core, hollow bodies produced in this way and their use for producing clutch disks or brake disks, in particular for automobiles

Fiber-bundle-reinforced composite material having a ceramic matrix, method for manufacturing a composite material and method for manufacturing elements formed of a composite material

A composite material includes a ceramic matrix and two different fractions of fiber bundles, namely a reinforcing fiber bundle fraction and a matrix fiber bundle fraction having different average fiber bundle lengths. The fractions of fiber bundles are separated in a total fiber bundle distribution relative to a fiber bundle length by a minimum. A method for manufacturing a composite material and a method for manufacturing elements formed of a composite material are also provided.

Ceramic component

A ceramic component, wherein the component contains 20 to 60 wt. % SiC, 5 to 40 wt. % free silicon and 10 to 65 wt. % free carbon. The disclosure also relates to the use of the component. The method for producing the ceramic component includes the following steps: a) providing a green body based on carbon, which has been produced by means of a 3D-printing method, b) impregnating the green body with a solution selected from the group consisting of a sugar solution, a starch solution or a cellulose solution, or a resin system including a mixture containing at least one resin, at least one solvent and at least one curing agent, wherein the at least one resin and the at least one solvent are different, c) drying or curing the impregnated green body.

Process for producing hollow bodies comprising fibre-reinforced ceramic materials

Process for producing hollow bodies comprising fibre-reinforced ceramic materials, where cores whose shape corresponds to that of the hollow spaces are produced in a first step, a green body is produced in a second step by introducing the abovementioned cores and a press moulding compound into a mould, where the press moulding compound comprises carbon fibres and/or carbon threads and pitch and/or resins, the green body is cured in a third step by heating under pressure, the cured green body is carbonised in a fourth step by heating in the absence of oxidants to form a C/C body, and, if desired, the C/C body is infiltrated with liquid metal with retention of its shape in a fifth step, with at least partial formation of carbides occurring, where the cores comprise a material which in the fourth step melts without decomposition at a temperature above the curing temperature of the shaping by pressing of the press moulding compound; hollow bodies produced by this process and also their use as brake disks, clutch disks and friction disks

Fiber-reinforced sandwich with ceramic matrix, process of its manufacture and use

Composite material reinforced with fiber bundles has a ceramic matrix. The material has a reinforcing fiber bundle part and a matrix bundle part having different fiber lengths divided by a minimum in the total fiber bundle distribution with respect to the fiber bundle length. An Independent claim is also included for a process for the production of the composite material.

Method for silicating carbonaceous materials

Treatment of a porous carbon workpiece (WP) with liquid silicon (lSi) to form silicon carbide (SiC) involves (a) preheating under inert gas to a temperature TB1, (b) optionally reducing pressure to 100 hPa or less, (c) impregnating with lSi at pressure pB2 and temperature TB2, (d) reacting at temperature TB3 (not less than TB2), in the absence of lSi outside the WP, to form SiC, (e) gassing with inert gas and cooling to conditioning temperature Tk and (f) cooling to room temperature. An independent claim is included for apparatus for carrying out the process, comprising at least four, separately heatable, coolable, evacuable and gas purgable chambers (O1 - O4), connected by air locks (10, 20, 30, 40). In the case of four chambers, one chamber is used for steps (a) and (b); one for step (c); one for steps (d) and (e); and one for step (f). In the case of six chambers, separate chambers are used for steps (a) and (b) or for step (d) and (e). In the case of six chamber each of steps (a) - (f) is carried out in separate chamber.

Process for producing ceramic materials using silicon carbide

Process for producing bodies from ceramic materials using silicon carbide, comprising the steps: configuration of fiber-reinforced porous bodies ( 1, 5 ) that consist of carbon on a base ( 2 ) that is inert relative to liquid silicon, the bodies having cavities ( 3 ) that are accessible from the exterior or surface recesses ( 3′ ), and the cavities ( 3 ) being closed at the bottom in the porous bodies or the surface recesses ( 3′ ) together with the base ( 2 ) forming a reservoir that is sealed at the bottom; heating the configuration by introduction of energy to melt the silicon ( 6 ) that is present in the reservoir; and infiltrating the melted silicon in the bodies ( 1, 5 ) and reaction of the silicon with the carbon to form silicon carbide; and use of the thus produced bodies as brake disks and as clutch driving disks.

Process for producing ceramic materials using silicon carbide

Process for producing bodies from ceramic materials using silicon carbide, comprising the steps: configuration of fiber-reinforced porous bodies ( 1, 5 ) that consist of carbon on a base ( 2 ) that is inert relative to liquid silicon, the bodies having cavities ( 3 ) that are accessible from the exterior or surface recesses ( 3 ′), and the cavities ( 3 ) being closed at the bottom in the porous bodies or the surface recesses ( 3 ′) together with the base ( 2 ) forming a reservoir that is sealed at the bottom; heating the configuration by introduction of energy to melt the silicon ( 6 ) that is present in the reservoir; and infiltrating the melted silicon in the bodies ( 1, 5 ) and reaction of the silicon with the carbon to form silicon carbide; and use of the thus produced bodies as brake disks and as clutch driving disks.

friction

Reibscheibe, insbesondere eine Brems- oder Kupplungsscheibe, aus mit Kohlenstoffasern verstärktem Keramik-Verbundwerkstoff, mit mindestens einer als Reibfläche ausgebildeten Deckfläche, wobei mindestens ein Teil der Reibfläche aus einem anderen Werkstoff, insbesondere aus einem kohlenstoffhaltigen Werkstoff, besteht, und dieser andere Werkstoff eine geringere Verschleiß- und Oxidationsbeständigkeit aufweist als der der restlichen Reibfläche und der Tragzone der Reibscheibe und durch den im Vergleich höheren Verschleiß ein optisches, akustisches oder mechanisches Signal unter Betriebsbedingungen ergibt, das vor dem Überschreiten der Lebensdauer der Reibscheibe warnt. Friction disk, in particular a brake or clutch disk, made of ceramic composite reinforced with carbon fibers, with at least one cover surface designed as a friction surface, at least part of the friction surface consisting of another material, in particular a carbon-containing material, and this other material being a lesser one Wear and oxidation resistance than that of the rest of the friction surface and the bearing zone of the friction disc and due to the higher wear in comparison results in an optical, acoustic or mechanical signal under operating conditions that warns that the life of the friction disc is exceeded.

Process for the production of a fiber-reinforced composite ceramic

The invention concerns fibre-reinforced composite ceramics with high-temperature fibres, in particular based on Si/C/B/N, which are bound in terms of reaction to an Si-based matrix. These composite ceramics are produced by impregnating bundles of fibrous material comprising Si/C/B/N fibres with a binder which is suitable for pyrolysis and solidifying the binder, the fibrous material bundles then optionally being conditioned with a silicating protective layer suitable for pyrolysis, such as for example phenolic resin or polycarbosilane. Subsequently a mixture of fibrous material bundles, fillers, such as for example SiC and carbon in the form of graphite or carbon black, and binders is produced. The mixture is then compacted to form a green compact which is then pyrolysed under vacuum or protective gas in order to produce a porous shaped body which is then infiltrated, preferably under vacuum, with molten silicon. In this way, fibre-reinforced composite ceramics which have greatly improved properties with respect to conventional composite ceramics and are in particular suitable for use in heavy-duty braking systems can be produced in an efficient manner suitable for production on an industrial scale.

Multilayer ceramic composite

Multilayered ceramic composite comprises composite material(s) forming supporting zone (SZ) and having oxidation-sensitive reinforcing fibers, ceramic surface layer(s) (CL) having reinforcing fibers and protective layer(s) (PL). PL is disposed between SZ and CL, and has additives whose oxides are glasses having m.pt of at most 1250 degrees C. Composite material and CL each have matrix and phases of specific material. Multilayered ceramic composite comprises composite material(s) forming supporting zone and containing oxidation-sensitive reinforcing fibers, ceramic surface layer(s) having reinforcing fibers, and protective layer(s) (PL). The composite material and ceramic surface layer each includes a matrix containing mass proportion(s) of at least 25% silicon carbide, further phases selected from phases having silicon and phases having silicon alloys, and carbon chosen from carbon in elemental form and a carbon compound. PL has a matrix composed of component(s) of the matrix of supporting zone or ceramic surface layer. PL is disposed between supporting zone and ceramic surface layer. PL contains additives whose oxides are low melting point glasses having melting point of at most 1250 degrees C. Independent claims are included for the following: (1) production of multilayered ceramic composite which involves bonding carbon-containing fiber-reinforced precursor forming supporting zone to carbon-containing precursor forming surface layer surface wide using an adhesive composition to form bonded article, pyrolyzing bonded article for forming a carbon-containing multilayered composite infiltrated with silicon or silicon alloys, and reacting portion(s) of carbon with silicon to form silicon carbide. Adhesive composition during pyrolysis produces a porous, carbon-containing layer. Adhesive composition contains glass-forming additives chosen from admixtures of high melting point elements, binary compounds and multinary compounds having melting point of at least 1450 ...

Process for the production of molded articles from fiber-reinforced ceramic materials

Method for producing a ceramic substance for a ceramic material

The invention relates to a method for producing a ceramic substance (100), which comprises the steps of (S1) producing a homogeneous mixture containing (a) carbon fibers having a fiber length distribution of D 50 < 15 μm and (b) at least one powdery and carbonizable binder (20), (S2) compacting the homogeneous mixture under the action of pressure (30), (S3) thermally treating for carbonizing, or for carbonizing and graphitizing, the compacted homogeneous mixture to obtain a carbon substance, and (S4) siliconizing the carbon substance to obtain the ceramic substance.

Friction or slip body comprising composite materials, reinforced with fibre bundles and containing a ceramic matrix

The invention relates to a friction or slip body which consists of at least two composite materials, reinforced with fibre bundles and containing a ceramic matrix. A first composite material acts as a friction layer, forming the exterior of the slip body and a second composite material forms a suppor t body which is in surface contact with the friction layer. The length of the fibre bundles of the friction layer is significantly shorter than the length of the fibre bundles of the support body. The bundles of fibres of the friction layer have a defined orientation that is perpendicular to the surface. The surface of the friction layer essentially has only small areas of a maximum 1.2 mm diameter of exposed carbon and the total proportion of exposed carbon on the surface is at maximum 35 %. The surface has a structur e of extremely fine fissures and the friction layer has practically no tension close to the surface.

Method for producing brake disks consisting of ceramic parts with metal hubs and a brake disk obtainable by the method

The invention relates to a method for producing brake disks with friction surfaces consisting of ceramic materials, especially composite materials. At least one ceramic part is placed in a diecasting mould and is joined to molten metals by casting under pressure, in order to obtain a rotationally symmetrical body. Said body contains at least one ceramic (composite) segment that is symmetrical to the axis of rotation of the metal body and projects beyond at least one surface of the metal body that is perpendicular to said axis.

Production of ceramic materials by pyrolysis of highly crosslinked polymer carbodiimides

The invention concerns a process for producing ceramic materials by pyrolysis of a polymer ceramic precursor. The ceramic precursor is produced by (a) reacting halides of elements selected from groups IIIA, IVA and VA of the periodic system, transition metals and rare-earth elements with a compound of the formula (I): R3 Si-N=C=N-SiR3, in which R, independently in each case, means a C1-C3 alkyl or alkenyl group, and (b) separating volatile components from the reaction mixture.

Method for producing brake disks consisting of ceramic parts with metal hubs

The invention relates to a method for producing brake disks with friction surfaces consisting of ceramic materials, especially composite materials. At least one ceramic part is placed in a diecasting mould and is joined to molten metals by casting under pressure, in order to obtain a rotationally symmetrical body. Said body contains at least one ceramic (composite) segment that is symmetrical to the axis of rotation of the metal body and projects beyond at least one surface of the metal body that is perpendicular to said axis.

Brake system with composite brake disc

Manufacture of ceramic materials by pyrolysis of highly cross-linked polymeric carbodiimides as ceramic precursors and ceramic precursors

Material, method for producing a material and use thereof

Material comprises: a matrix (23), which is at least one of plastic, carbon, ceramic, glass, clay or metal; and at least one reinforcing element introduced into the matrix, and having a spherical to ellipsoidal shape and an onion skin-like structure. An independent claim is also included for producing the material, comprising: (a) preparing the reinforcing element; and (b) introducing the reinforcing element into the matrix.

Carbon fibre reinforced brake discs

A process of manufacturing a brake disc assembly comprising preparing a layered structure, applying a pressure treatment to the layered structure, and carbonising and siliconising the layered structure in order to obtain the brake disc ring. Preparing the layered structure comprises preparing a carrier body having an interface portion, the interface portion having a first density and a surface region, increasing a smoothness of the surface region and/or increasing a density of the interface portion by applying a primer layer to the surface region, applying a bonding layer to the surface region, and applying a friction layer to the bonding layer. A brake disc ring, comprising a carrier body, a bonding layer distributed substantially uniformly over at least a part of a surface region of the carrier body, and a friction layer. The carrier body comprises an interface portion with a higher density that that of a core portion of the carrier body.

Method for producing friction discs from fibre-reinforced ceramic materials

Die Erfindung betrifft ein Verfahren zur Herstellung von Reibscheiben aus faserverstärkten keramischen Werkstoffen, bei dem zunächst ein Reibschicht-Vorkörper hergestellt wird in Form einer separat hergestellten zylinderringförmigen Scheibe aus einer Mischung von Siliciumcarbid-Pulver, von Silicium-Pulver, von einem carbonisierbaren Bindemittel und gegebenenfalls von einem geringen Anteil an Kohlenstoff-Kurzfasern durch Pressen zu einer zylinderringförmigen Scheibe, Härten und Carbonisieren, der Reibschicht-Vorkörper dann mit einem Tragkörper kombiniert wird, der entweder im CFK-Zustand oder im CSiC-Zustand vorliegt, und die Kombination gegebenenfalls nach weiterem Carbonisieren mit flüssigem Silicium unter vermindertem Druck infiltriert wird.

Ceramic composites reinforced with fibers and process for producing thereof

The invention concerns fibre-reinforced composite ceramics with high-temperature fibres, in particular based on Si/C/B/N, which are bound in terms of reaction to an Si-based matrix. These composite ceramics are produced by impregnating bundles of fibrous material comprising Si/C/B/N fibres with a binder which is suitable for pyrolysis and solidifying the binder, the fibrous material bundles then optionally being conditioned with a silicating protective layer suitable for pyrolysis, such as for example phenolic resin or polycarbosilane. Subsequently a mixture of fibrous material bundles, fillers, such as for example SiC and carbon in the form of graphite or carbon black, and binders is produced. The mixture is then compacted to form a green compact which is then pyrolysed under vacuum or protective gas in order to produce a porous shaped body which is then infiltrated, preferably under vacuum, with molten silicon. In this way, fibre-reinforced composite ceramics which have greatly improved properties with respect to conventional composite ceramics and are in particular suitable for use in heavy-duty braking systems can be produced in an efficient manner suitable for production on an industrial scale.

Producing product with predetermined spatial structure or carbon-fiber-reinforced material, comprises providing many homogeneous plates, concatenating to form a body enveloping predetermined spatial structure, and processing

Producing a product with a predetermined spatial structure or with a carbon-fiber-reinforced material, comprises: providing many homogeneous plates made of the carbon-fiber-reinforced material or its perform; concatenating many plates and forming a body enveloping the predetermined spatial structure; and processing the enveloping body and isolating the product or its preform with the predetermined spatial structure. An independent claim is also included for a product with a carbon-fiber-reinforced material having a predetermined spatial structure, which is produced from the above mentioned method.

Friction-resistant discs made of fibre reinforced ceramic

Ceramic materials containing carbon particles of spherical shape

Ceramic material (A) comprises at least a carbide or a carbide forming element and carbon in its matrix, and a further dispersion phase containing spherical shaped carbon particle with an average diameter of 0.2-800 mu m. An independent claim is included for the preparation of (A) comprising condensing a mixture containing the spherical shaped carbon particle and a binding agent such as artificial resins and pitches, and optionally a fiber from the carbon to an essentially pore free body; carbonizing the obtained body to a porous carbon body, by heating at 750-1300[deg]C; and reacting porous carbon body with a carbide forming element or its mixture at a melting temperature of carbide forming element to 500 K above the melting temperature, where at least 10 wt.% of carbon in the carbon body reacts with carbide.

Fibre-reinforced composite ceramics infiltrated with molten metal

The invention concerns fibre-reinforced composite ceramics infiltrated with molten metal and comprising high-temperature fibres, in particular based on Si/C/B/N, which are bound in terms of reaction to an Si-based matrix. The invention also concerns a method of producing such ceramics. The molten silicon used for infiltration purposes contains additions of iron, chromium, titanium, molybdenum, nickel or aluminium, molten silicon containing approximately 5 to 50 weight % iron and approximately 1 to 10 weight % chromium being particularly preferred. The production method is simpler than conventional molten silicon infiltration methods and imparts improved properties to the composite ceramics.

Friction Disks having a Structured Ceramic Friction Layer

The cylindrical ring-shaped friction disc comprises a support body and a friction layer, where an intermediate layer is arranged between the support body and friction layer. The intermediate layer has mutually adjoining flat regions with different coefficients of thermal expansion. The difference in the thermal expansion of flat regions lies with different thermal expansion of 10% of the higher value for the linear thermal expansion coefficient. The regions in the intermediate layer exhibit dimensions in the plane parallel to a bottom surface or a top surface of the disc of 0.5-10 mm. An independent claim is included for a method of preparing a cylindrical ring-shaped friction disc.

Method for producing a polysilane

Ceramic materials containing carbon particles of spherical shape

3-d printing of a ceramic component

The invention relates to a three-dimensional, ceramic component containing silicon carbide, to a method for producing the component, and to the use of the component. The method for producing a three-dimensional, ceramic component containing silicon carbide comprises the following steps: a) providing a powdery composition having a grain size (d50) between 3 microns and 500 microns and comprising at least 50 wt% of coke, b) providing a liquid binder, c) depositing a layer of the material provided in a) in a planar manner and locally depositing drops of the material provided in b) onto said layer and repeating step c), wherein the local depositing of the drops in the subsequent repetitions of said step is adapted in accordance with the desired shape of the component to be produced, d) at least partially curing or drying the binder and obtaining a green body having the desired shape of the component, e) carbonizing the green body, and f) siliconizing the carbonized green body by infiltration with liquid silicon, wherein the green body, while above the melting temperature of silicon and while located substantially above the surface of a silicon bath, becomes saturated with silicon by capillary forces.

Fibre-reinforced composite ceramics and method of making same

1. Sposób wytwarzania ceramiki kompleksowej wzmocnionej wlóknem w postaci wlókien zaro- odpornych, zwlaszcza C-wlókien lub SiC-wlókien, które zwiazane sa reakcyjnie z matryca na bazie Si, znamienny tym, ze kolejno: - impregnuje sie wiazki wlókien, zwlaszcza zlozone z C-wlókien lub SiC-wlókien, przy uzyciu organicznego srodka wiazacego stosowanego do pirolizy i utwardza sie srodek wiazacy, - wytwarza sie mieszanke zlozona z wiazek wlókien, wypelniaczy nieorganicznych i srodków wiazacych podlegajacych pirolizie, - tloczy sie mieszanke i uzyskuje sie pólwyrób, - pólwyrób poddaje sie pirolizie w prózni lub w gazie ochronnym. - nasyca sie korpus ksztaltowy roztopionym krzemem. PL PL PL PL PL PL PL

Composite containing reinforcing fibers comprising carbon

Composite which contains reinforcing fibers comprising carbon and whose matrix comprises silicon carbide, silicon and copper, with the mass fraction of copper in the composite being up to 55%, processes for producing it, in particular by liquid infiltration of C/C intermediate bodies with melts comprising Si and/or Cu and Si, and also its use as friction lining in a friction pairing with ceramic brake discs or clutch discs comprising C/SiC.

Friction disc and process for producing the same

A friction disc, in particular a brake or clutch disc, includes carbon fiber-reinforced ceramic composite material with at least one top surface formed as a friction surface. At least part of the friction surface is formed of a different material, in particular of a carbon-containing material. The different material exhibits lower wear and oxidation resistance than that of the rest of the friction surface and a supporting zone of the friction disc. A visual, audible or mechanical signal is produced under operating conditions due to comparatively greater wear. The signal provides a warning that the service life of the friction disc is being exceeded. A process for producing the friction disc is also provided.

fiber composite components

Method for siliconizing carbon-containing materials

A method for treating workpieces that consist of porous carbon material with liquid silicon with the formation of silicon carbide, comprising the steps: Preheating porous carbon workpieces under inert gas to the selected operating temperature T B 1 , feeding liquid silicon to the porous carbon workpieces at an operating pressure p B 2 and an operating temperature T B 2 , and impregnating the porous carbon workpieces with liquid silicon, reaction of the liquid silicon in the workpiece at a temperature T B 3 with the formation of silicon carbide that consists of carbon and silicon, gassing the workpiece with inert gas and cooling from the operating temperature T B 3 to the conditioning temperature T k , cooling the workpieces to room temperature, the temperature T B 3 being greater than or equal to the temperature T B 2 , and the workpiece in step d of the method no longer being in contact with liquid silicon outside of the workpiece.

Fiber-reinforced silicon carbide composite materials

The invention relates to silicon carbide composite materials comprising CSiC with a density of 2.95 to 3.05 g/cm -3 and a fiber bundle content of 2 to 10 wt.%. The fiber bundles have a length of 6 to 20 mm, a width of 0.2 to 3 mm, and a thickness of 0.1 to 0.8 mm. The fiber bundles are filled with a cured phenolic resin content of up to 45 wt.%, and the protected fiber bundles are integrated into an SiC matrix. The invention also relates to a method for producing the silicon carbide composite materials and to the use thereof.

Fibre-reinforced composite ceramics and method of producing the same

The invention concerns fibre-reinforced composite ceramics with high-temperature fibres, in particular based on Si/C/B/N, which are bound in terms of reaction to an Si-based matrix. These composite ceramics are produced by impregnating bundles of fibrous material comprising Si/C/B/N fibres with a binder which is suitable for pyrolysis and solidifying the binder, the fibrous material bundles then optionally being conditioned with a silicating protective layer suitable for pyrolysis, such as for example phenolic resin or polycarbosilane. Subsequently a mixture of fibrous material bundles, fillers, such as for example SiC and carbon in the form of graphite or carbon black, and binders is produced. The mixture is then compacted to form a green compact which is then pyrolysed under vacuum or protective gas in order to produce a porous shaped body which is then infiltrated, preferably under vacuum, with molten silicon. In this way, fibre-reinforced composite ceramics which have greatly improved properties with respect to conventional composite ceramics and are in particular suitable for use in heavy-duty braking systems can be produced in an efficient manner suitable for production on an industrial scale.

3-d printing of a ceramic component

Method for manufacturing friction disks with ceramic materials with improved friction layer

Method for manufacturing a friction disk including preparing a mixture including a carbide-forming element having an average particle size ≦2,000 μm, a resin, optionally a binder, and optionally fine carbon, and/or short carbon fibers; forming the mixture at ≦ to 280° C. to produce a molded body; heating the molded body to approximately 750° C. to approximately 1300° C. to form a porous carbon body including a carbon residue; heating the porous carbon body to a temperature above the melting point of the carbide-forming element thereby reacting the carbide-forming element with at least a portion of the carbon residue to yield an alveolar structure; infiltrating the alveolar structure with silicon at a temperature above the melting point of silicon thereby filling at least one pore of the alveolar structure with silicon and reacting the silicon with an amount of unreacted carbon residue to form silicon carbide; and obtaining a friction disk.

Boron-contg. poly:carbo:siloxane(s), useful for prodn. of ceramics - by reacting tris-chloro:silyl:ethyl-borane(s) with diol(s) in presence of organic base

B-contg. polycarbosiloxanes (II) are produced by reacting tris-silyl-borane(s) of formula B(-C2H4-SiCl2X)3 (I) with diols of formula HO-R'-OH in presence of organic base. In (I), gp. -C2H4 is -CH2-CH2- or -CHMe-; X is Cl or 1-4C aliphatic residue; R' is 2-4C alkphatic residue. In (II), R is 1-4C aliphatic residue; and a + b is 1. At least equimolar amts. of diol are used, and cpd. (I) is reacted as a soln. in organic solvent; the reactants are mixed at -10 to +10 deg. C and the mixt. heated at 10-200 deg. C. Pref. (I) are prepd., e.g. by reaction of corresp. vinylsilanes of formula CH2=CH-SiCl2X with BH3.THF as described in J. Organomet. Chem. 34 (1972) C9 and 135 (1977) 249, and in Zhur. Obshchei. Khim. 30 (1960) 3615. Pref. diol is ethane-1,2-diol, propane-1,3-diol or butane-1,4-diol. Suitable solvents are e.g. hexane, toluene, THF etc., and the base is, e.g. Et3N, pyridine etc. USE/ADVANTAGE - (II) are new B-contg. polycarbosiloxanes, useful for the prodn. of B- and Si-contg. ceramics with good adhesion, hardness and surface quality, which are useful for coating steel, etc. esp. for the surface coating of machine components which are subjected to mechanical and chemical stress. (II) can also be shaped before pyrolysis, e.g. to give ceramic fibres which are useful for reinforcement of Al, Al alloys and ceramic components. In an example, tris-((dichloromethylsilyl)ethyl)-borane (I) are prepd. by reacting 216g dichloomethylvinylsilane in 255 ml toluene with 255 ml 2M soln. of BH3.SMe2 in toluene, followed by evapn. of solvent to give 233g (I). Mixt. of 12.55g (I), 13.7g pyridine and 50 ml THF was treted at 01-0 deg. C with a mixt. of 10 ml THF and 5.5g ethylene glycol, then stirred for 2 hrs. at 30 deg. C and worked up by filtration and evapn. to give 7.8g (II). Soln. of (II) in THF was spun and drawn off at 200 m/min. to give fibres of dia. 20-30 microns. Fibres were dried at 50-60 deg. C in argon and then pyrolysed in argon by heating to 1100 deg. C at 1.5 ...

Composite containing reinforcing fibers comprising carbon

Composite which contains reinforcing fibers comprising carbon and whose matrix comprises silicon carbide, silicon and copper, with the mass fraction of copper in the composite being up to 55%, processes for producing it, in particular by liquid infiltration of C/C intermediate bodies with melts comprising Si and/or Cu and Si, and also its use as friction lining in a friction pairing with ceramic brake discs or clutch discs comprising C/SiC

Verfahren zum imprägnieren von kurzfaserbündeln aus carbonfasern

Mit faserbündeln verstärkter verbundwerkstoff mit keramischen matrix

Faserverstärker keramischer verbundwerkstoff

3-D printing of a ceramic component

A method for producing the component, and to the use of the component. The method for producing a three-dimensional, ceramic component containing silicon carbide, by a) providing a powdery composition having a grain size (d50) between 3 microns and 500 microns and comprising at least 50 wt % of coke, b) providing a liquid binder, c) depositing a layer of the material provided in a) in a planar manner and locally depositing drops of the material provided in b) onto said layer and repeating step c), the local depositing of the drops in the subsequent repetitions of the step is adapted in accordance with the desired shape of the component to be produced, d) at least partially curing or drying the binder and obtaining a green body having the desired shape of the component, e) carbonising the green body, and f) siliconising the carbonised green body by infiltration with liquid silicon.

Reibscheibe und verfahren zu ihrer herstellung

Ceramic component

A ceramic component containing silicon carbide and to the use of the component. The method for producing the ceramic component includes the following steps: a) providing a green body based on SiC, which has been produced by means of a 3D-printing method, b) impregnating the green body with a solution selected from the group consisting of a sugar solution, a starch solution or a cellulose solution, or a resin system comprising a mixture containing at least one resin, at least one solvent and at least one curing agent, the at least one resin and the at least one solvent being different, c) drying or curing the impregnated green body, d) carbonising the dried or cured green body, wherein a fine-pored, foam-like carbon skeleton is produced from the dried solution or a fine-pored, sponge-like carbon skeleton is produced from the cured resin system.

Innenbelüftete Bremsscheiben mit verbessertem Wärmeübergang

Verfahren zur herstellung von bremsscheiben aus keramikteilen mit metallnaben und eine bremsscheibe herstellbar nach dem verfahren

Carbon-Keramik-Bremsscheibe mit Belastungsanzeige

Verwendung von elementen aus einem mit fasern verstärkten verbundwerkstoff mit keramischer matrix

Uso de elementos hechos de un material compuesto con matriz ceramica reforzado con fibras

Esta invención se refiere al uso de elementos hechos de un material cerámico con matriz cerámica reforzado con fibras, material el cual contiene por lo menos 10% de peso en carburo de silicio, constituyendo la porción de fibras de carbono y/o de fibras de silicio por lo menos 5% del peso total de las fibras, para la absorción parcial o total de por lo menos una carga puntual tipo impacto, siendo la dimensión de dichos elementos en una dirección perpendicular a la dirección de la carga por lo menos 3 cms. El espesor de los elementos usados puede reducirse particularmente en los compuestos de la invención en los que los elementos presentan un refuerzo trasero (soporte) que en la mayoría de los casos va adherido.En particular, los elementos y los compuestos de la invención se usan como componentes estructurales. Ellos sirven aquí entre otras cosas para el blindaje en la construcción de vehículos de tipo civil y militar. Con los elementos y los compuestos de la invención también es posible el blindaje de objetos estacionarios. Además los elementos y los compuestos de la invención pueden ser usados también en chalecos antibalas.

Reibscheiben aus faserverstärkten keramischen Verbundswerkstoffen

Reibscheiben aus faserverstärkten keramischen verbundswerkstoffen

Anvendelse av elementer laget av et fiberforsterket komposittmateriale med keramisk matriks

Innenbelüftete Bremsscheiben mit verbessertem Wärmeübergang

Pouľití prvků z vlákny vyztuľeného kompozitního materiálu s keramickou matricí

Reibscheibe

Reibkörper aus faserverstärkten Keramik-Verbundstoffen

Verwendung von Elementen aus einem mit Fasern verstärkten Verbundwerkstoff mit keramischer Matrix

Protecting member made of fibre-reinforced composite with ceramic matrix and protecting apparatus incorporating at least one protecting member of that kind

Anvendelse av elementer laget av et fiberforsterket komposittmateriale med keramisk matriks

Oppfinnelsen vedrører anvendelsen av en kompositt av et element laget av et karbon-fiber og/eller grafitt-fiber- forsterket komposittmai riale med keramisk matriks inneholdende minst 10 vekt% silisiumkarbid, hvorved andelen av karbon- og/eller grafiufibrer til massen av fibrene utgjør minst 5 vekt%, til delvis eller fullstendig absorpsjon av minst en støtlignende, punktvis belastning, hvis dimensjoner i en retning loddrett på belastningsretningen er minst 3 cm. Tykkelsene på de anvendte elementene av de fiberforsterkede komposittene kan spesielt reduseres i de oppfmneriske komposittene, hvorved elementene har en forsterkning på baksiden (underlag), som oftest blir påklebet. Spesielt anvendes de oppfmneriske elementene og komposittene som strukturbyggedeler. De fungerer her som pansring blant annet i kjøretøyer av såvel sivil som også militær art. Også pansringen av faststående objekter er mulig med de oppfmneriske elementene og komposittene. Videre kan de oppfmneriske elementene og komposittene også benyttes i beskyttelsesvester.

Verfahren und Vorrichtung zum Prüfen von Carbon-Keramik-Bremsscheiben

Bremssystem mit verbundwerkstoff bremsscheibe

Formkörper aus faserverstärkten Verbundwerkstoffen mit segmentierter Deckschicht, seine Herstellung und seine Verwendung

Verfahren zum Oxidationsschutz faserverstärkter Verbundwerkstoffe

Verfahren und Vorrichtung zum Prüfen von Carbon-Keramik-Bremsscheiben

Verfahren zur herstellung eines faserverstärkten, wenigstens im randbereich aus einer metall- verbundkeramik bestehenden werkstoffs

Formkörper aus faserverstärkten Verbundwerkstoffen mit segmentierter Deckschicht, seine Herstellung und seine Verwendung

Die vorliegende Erfindung betrifft Formkörper aus faserverstärkten keramischen Verbundwerkstoffen umfassend eine Kernzone und mindestens eine Deckschicht, die einen höheren thermischen Ausdehnungskoeffizienten als die Kernzone besitzt. Die Deckschicht ist dabei eine SiC-reiche Deckschicht und in Segmente eingeteilt, die durch Leerstellen oder Stege aus einem anderen Material als das Material der Segmente von den benachbarten Segmenten getrennt sind. Die Erfindung betrifft auch ein Verfahren zum Herstellen derartiger Formkörper durch Infiltrieren eines Vorkörpers mit schmelzflüssigem Silicium und deren Verwendung für Reibscheiben, im Fahrzeugbau oder als Schutzscheibe

Verfahren zum Oxidationsschutz faserverstärkter Verbundwerkstoffe

Verfahren zum Oxidationsschutz faserverstärkter, kohlenstoffhaltiger Verbundwerkstoffe, deren Matrix zumindest in der Randschicht Siliciumcarbid (SiC), sowie Silicium (Si) und/oder Siliciumlegierungen enthält, umfassend die Schritte a) Imprägnieren des Verbundwerkstoffs mit einer wäßrigen, phosphathaltigen Lösung, b) Trocknung, c) Wärmebehandlung bei einer Temperatur, welche wenigstens ausreicht, um die getrocknete Lösung in nicht lösliche Verbindungen umzuwandeln, die zur Ausbildung eines selbstheilenden Glases geeignet sind, wobei der Verbundwerkstoff vor dem Schritt a), zwischen den Schritten a) und b), während oder nach dem Schritt b) und/oder c) zur Ausbildung von Siliciumoxid (SiO 2 ) oxidierend behandelt wird

Faserverstärkte siliziumcarbid-verbundwerkstoffe

Es werden Siliziumcarbid-Verbundwerkstoffe beschrieben, wobei diese CSiC mit einer Dichte von 2,95 bis 3,05 g/cm-3 und einem Faserbündelanteil von 2 bis 10 Gew.% umfassen, bei dem die Faserbündel eine Länge von 6 bis 20 mm, eine Breite von 0,2 bis 3 mm und eine Dicke von 0,1 bis 0,8 mm aufweisen, die Faserbündel mit einem ausgehärteten Phenolharzanteil von zu 45 Gew.% gefüllt sind und diese geschützten Faserbündel in eine SiC Matrix integriert sind, sowie ein Verfahren zur Herstellung der Siliziumcarbid-Verbundwerkstoffe und deren Verwendung.

Fiber-reinforced silicon carbide composite materials, method for producing the fiber-reinforced silicon carbide composite materials, and uses of the fiber-reinforced silicon carbide composite materials

Silicon carbide composite materials contain CSiC with a density of 2.95 to 3.05 g/cm −3 and a fiber bundle content of 2 to 10 wt. %. The fiber bundles have a length of 6 to 20 mm, a width of 0.2 to 3 mm, and a thickness of 0.1 to 0.8 mm. The fiber bundles are filled with a cured phenolic resin content of up to 45 wt. %, and the protected fiber bundles are integrated into an SiC matrix. A method produces the silicon carbide composite materials.