Способ получения пористых керамических гранул из волластонита и хардистонита

Изобретение относится к способу получения пористых керамических гранул, содержащих в своем составе различные пропорции биосовместимых синтетических солей - силикатов кальция. Технический результат - получение сферических керамических гранул с варьируемым в широком диапазоне содержанием волластонита и хардистонита, равномерно распределенных по объему материала. Способ получения пористых керамических гранул из волластонита и хардистонита характеризуется тем, что получают суспензию из двухкомпонентного порошка, содержащего от 1,5 до 25 мас.% оксида цинка в смеси с волластонитом, и 15% водного раствора желатина, взятых в пропорции 1:1,7-2, прикапывают суспензию в емкость с растительным маслом с температурой около 0°С, перемешиваемым со скоростью 1000 об/мин, фильтруют сформировавшиеся гранулы, промывают изопропиловым спиртом, высушивают и прокаливают на воздухе при 1250°С. 2 ил., 1 табл., 3 пр.

Способ допирования MgO-nAlOкерамик ионами железа

Изобретение относится к области квантовой электроники и может использоваться для синтеза активной среды при создании мощных лазеров, генерирующих в среднем ИК-диапазоне длин волн. Техническим результатом изобретения является повышение однородности распределения, концентрации и толщины активного слоя ионов Feв керамической матрице из MgO-nAlO, где n - мольное содержание AlO. Способ включает приготовление мишени из грубых порошков FeO, MgO и AlOв соотношении, необходимом для получения алюмомагниевой шпинели требуемой стехиометрии и уровня допирования ионами железа, испарение мишени лазерным излучением с получением однородного нанопорошка со средним размером частиц порядка 10-20 нм и последующее прокаливание компакта, спрессованного из таких порошков. В этом случае допирование алюмомагниевой шпинели ионами железа происходит в два этапа. На первом этапе при испарении мишени лазерным излучением производят смешивание паров окислов FeO, MgO и AlOв лазерном факеле. Процесс смешивания реализуется ...

СВЕРХТОНКОЗЕРНИСТОЕ АЛМАЗНОЕ СПЕЧЕННОЕ ИЗДЕЛИЕ ВЫСОКОЙ ЧИСТОТЫ И ВЫСОКОЙ ТВЕРДОСТИ

... 1. Сверхтонкозернистое алмазное спеченное изделие высокой чистоты и высокой твердости, имеющее размер зерна, составляющий 100 нм или менее, которое получено путем подвергания сверхтонкозернистого природного алмазного порошка, имеющего гранулометрический разброс от нуля до 0,1 мкм, десиликации, сублимационной сушке порошка, подвергнутого десиликации, в растворе и спеканию осушенного сублимацией порошка без спекающей добавки. 2. Сверхтонкозернистое алмазное спеченное изделие высокой чистоты и высокой твердости по п.1, которое способно пропускать свет. 3. Способ получения сверхтонкозернистого алмазного спеченного изделия высокой чистоты и высокой твердости, предусматривающий десиликацию сверхтонкозернистого природного алмазного порошка, имеющего гранулометрический разброс от нуля до 0,1 мкм; сублимационную сушку подвергнутого десиликации порошка в растворе; заключение осушенного сублимацией порошка в танталовую или молибденовую капсулу; и нагрев и приложение избыточного давления к капсуле, ...

Druckverfahren zur Herstellung eines Grünkörpers, Grünkörper und keramischer Formkörper

Verfahren zur Herstellung eines Grünkörpers, bei dem man a) eine Schicht, die ein keramisches, glaskeramisches oder Glaspulver enthält, auf einer Unterlage bildet, b) mindestens eine Verfestigungszusammensetzung auf die zuvor genannte Schicht auf zumindest einen Teil davon appliziert, die wenigstens eine organometallische Verbindung, wobei diese wenigstens ein Atom aufweist, das nicht C, Si, H, O oder N ist, und dieses Atom an wenigstens einen organischen Rest gebunden ist, enthält, c) Schritte a) und b) mindestens einmal wiederholt, und d) das nicht gebundene keramische Pulver entfernt, wobei der Grünkörper freigelegt wird, wobei die Viskosität der Verfestigungszusammensetzung höchstens 50 mPa × s bei 20°C und 1 bar beträgt.

Verfahren zur Herstellung von Halbleiter auf Basis von Zinkoxid

KONTINUIERLICHE VERFAHREN ZUR HERSTELLUNG VON FEINEN KERAMISCHEN TEILCHEN.

VERFAHREN ZUR HERSTELLUNG HÖCHSTREAKTIVER SUBMIKRON AMORPHER TITANDIBORIDPULVER UND ERZEUGNISSE DARAUS.

VERFAHREN ZUR HERSTELLUNG EINES NATRIUM ENTHALTENDEN GLASES ODER EINER KERAMIK.

VORRICHTUNG ZUR HERSTELLUNG VON ULTRAFEINEN PULVERN.

New ceramic dispersant

The invention relates to an improved process for producing a fired ceramic oxide material, in which a ceramic powder is dispersed in an aqueous solution contains a dispersant containing as active constituent a terpolymer comprising from about 10 to about 90 mol% of (meth)acrylic acid, from about 5 to about 85 mol% of (meth)acrylamide and from about 5 to about 85 mol% of sulphoalkyl(meth)acrylamide and having a molecular weight of from about 4,000 to about 80,000, and in which the sulphoalkyl(meth)acrylamide contains a radical having the general structural formula: where R1 is a hydrogen atom or an alkyl group preferably having from 1 to 4 carbon atoms, R is a hydrocarbon group having from 1 to 3 carbon atoms and X<(+)> is a cation, preferably Na<+>, NH4<+>, H<+>, K<+> and Ca <++>. The slurry containing the dispersed ceramic oxide powder is spray-dried, compacted (pressed) while it is essentially dry, and heated to form a fired ceramic material.

PROCESS FOR THE PRODUCTION OF BASIC ZIRCONIUM CARBONATE

VERFAHREN ZUR HERSTELLUNG VON BASISCHEM ZIRKONIUMKARBONAT

Producing lead zirconate-titanate ceramic powder - by spray drying salt solution and calcining

Lead zirconate-titanate (PZT) ceramic powder is produced by making a salt solution containing the element which make up the PZT powder in stoichiometric ratio, spray drying the solution at an entry temperature of 400-500 deg. C, calcining the powder at 450-700 deg.C for 3-6 hr. and grinding the powder using a low grinding force. USE/ADVANTAGE - Producing PZT powder for making piezoelectric components which convert mechanical impulses to electric impulses and vice-versa. The powder produced is chemically homogeneous, finely dispersed, highly compactable and highly sinter reactive which enables the powder to be sintered at low temps.

Improved Manufacture of Articles of Ceramic Refractory Material.

... 14,235. Schwerin, Graf B. June 18. [Addition to 2626/11.] Pottery-materials; pottery.-Articles of ceramic refractory material are made from material not naturally plasic, other than corundum or carborundum, by working it in the colloidal condition, in the following manner. The material must be in very fine powder, made by grinding if necessary. It is suspended in water or other liquid, and if necessary an acid or base is added, according as the suspended material is electropositive or electronegative. Coarse particles or impurities are precipitated. The suspended material is next separated from the liquid either by deposition, which may be aided mechanically, or by electroosmotic methods, as described in Specifications 10,024/07 and 3364/11, [both in Class 41, Electrolysis]. The suspended material, mixed with water, is cast or moulded, and then dried and fired. The articles produced are porous or dense in accordance with the temperature at which they are fired.

MORTAR COMPOSITIONS

... 1459118 Heat-setting refractory mortar KAISER ALUMINUM & CHEMICAL CORP 9 Oct 1974 [15 Nov 1973] 43756/74 Heading C1J A heat-setting refractory mortar comprises, by weight of the total weight of the composition (1) 85-99À4% of pre-reacted magnesiachrome grain containing 40-80% MgO, the grain being substantially all finer than 35 mesh (Tyler) and containing 25-75% - 325 mesh material; (2) up to 13% Cr 2 O 3 substantially all of which passes a 325 mesh screen; (3) 0À5- 1-5% dextrin and (4) 0À1-0À5% methyl cellulose, the amount of Cr 2 O 3 and the percentage of pre-reacted grain finer than 325 mesh being such that the linear shrinkage of the mortar upon heating to 1650‹ C. is not over 5%. The chromic oxide is a synthetic material containing at least 95% Cr 2 O 3 . The pre-reacted grain is made by sintering, e.g. at 1950‹ C. a mixture of chrome ore and a source of magnesia. In use the mortar is mixed with water and thereafter set by firing, e.g. at 1650-1700‹ C.

METHOD OF PREPARING METAL CARBIDES AND THE LIKE AND PRECURSORS USED IN SUCH METHOD

Use of a jet of liquid to produce powder and/or polyhedral grains from solid material

A powder and/or polyhedral grains are produced by directing one or more jets 16 of liquid at a body of the solid material 1, thereby causing the ablation of powder particles from the solid material 1. The jet or jets 16 of liquid may be controlled to cut polyhedral grains from the solid material 1. The liquid and entrained powder particles and/or grains 17 is then collected and the powder particles and/or grains are separated from the liquid. The liquid jets 16 are preferably water, collection made in a water bath 20 and separation performed by a centrifuge 22 or gravity. Titanium powder and/or polyhedral grains can be made, with the titanium being embrittled by a heat and quench cycle or by doping with an interstitial element before blasting. Also titanium aluminide and ceramic particles and/or polyhedral grains can be made.

METHOD FOR MANUFACTURING POWDERS

Production of pellets of ceramic material

Ceramic pellets, which may have, or not, nuclear fuel materials embedded therein, are formed by first preparing a gel by precipitation of metallic salts from solutions of their compounds at a concentration of at least 10 grams per liter, said solutions being added dropwise to a coagulation bath which contains, for example, ammonium or sodium hydroxide, whereafter the precipitated gel are fired, in one or two stages, to precondition them prior to the compaction to form the final pellets which are subsequently sintered at an appropriate temperature.

PROCESS FOR PRODUCING CERAMIC ALUMINIUM OXIDE ARTICLES

According to the process of the present invention, an aluminium compound, preferably aluminium hydroxide, boehmite, gamma-aluminium oxide or alpha-aluminium oxide or a mixture thereof is activated by means of additives and sintered in order to obtain shaped, ceramic articles. The process of the present invention comprises adding in each case either yttrium oxide or lanthanum oxide or neodymium oxide or an equivalent amount of a salt thereof which can be converted into the corresponding oxide by heating to separate batches of aluminium compound or aluminium compounds in an amount of at least 0.05% by weight, based on the aluminium oxide content; separately homogenizing the separately obtained mixtures by milling and subjecting them to a thermal treatment at a temperature of at least 1450 degree C so that at least 80% by weight of the additives react with aluminium oxide; subsequently mixing two or three of the activated aluminium oxides obtained in this way, milling the resulting mixture ...

PROCEDURE AND DEVICE FOR THE PRODUCTION OF CERAMIC POWDERS ON THE BASIS OF EINUND/ODER MEHRKOMPONENTIGEN METALLIC OXIDES, AS WELL AS OF THEIR MIXTURES

PRODUCTION OF AN ELECTRICALLY LEADING ARTICLE FROM CARBORUNDUM

PROCEDURE AND DEVICE FOR THE PRODUCTION OF CERAMIC POWDERS ON THE BASIS OF EINUND/ODER MEHRKOMPONENTIGEN METALLIC OXIDES, AS WELL AS OF THEIR MIXTURES

PROCEDURE FOR THE PRODUCTION OF POWDERED MASSES FOR THE INJECTION MOULDING OF CERAMIC MATERIALS AND THEIR USE

PROCEDURE FOR THE PRODUCTION OF A POWDER MOLDED ARTICLE

PROCEDURE FOR THE COMPOUNDIEREN OF CERAMIC INJECTION MOULDING MASSES AND FIBER MASSES.

PROCEDURE FOR THE PRODUCTION OF HOMOGENEOUS, PURIFY-HASTY CERAMIC(S) POWDER.

PROCEDURE FOR THE PRODUCTION OF SEMICONDUCTOR ON BASIS OF ZINC OXIDE

FORMED SHARPENING PARTICLES AND PROCEDURES FOR YOUR PRODUCTION

PROCEDURE FOR THE PRODUCTION OF BASIC ZIRCONIUM CARBONATE.

PROCEDURE FOR THE PRODUCTION OF WHISKER-STRENGTHENED CERAMIC(S)

PRODUCTION OF GEFÖRMTEN ZIRCONIUM OXIDE PARTICLES

ZIRCONIUM OXIDE PARTICLE

Process for the production of ultrafine particles

PREPARATION OF MONO-SIZED ZIRCONIA POWDERS

ZIRCONIUM OXIDE CERAMICS

PREPARATION OF HOMOGENEOUS OXIDES OF MIXED METALLIC ELEMENTS

PREDETERMINED AND ENHANCED DENSIFICATION IN SINTERED METAL OXIDES

... 24 Disclosed is a method of producing ceramic-form-ing oxide powders with variable and predetermined sintering characteristics such as MgO, BaO, Ta2O5, ZnO, CeO, SnO, CaO, Cr2O3, CoO, As2O3, Sb2O3, ZrO2, TiO2, ThO2 Y2O3, SiO2, UO2, A12O3, and Tio2. There is a relationship between sintering rate of oxide powders produced from metal alkoxides and degree and nature of hydrolysis. This relationship between the degree of hydrolysis of the corresponding alkoxide and the density of the resulting oxide is determined by hydrolyzing several samples of the alkoxide using different amounts of water in diluted systems. The samples are sintered to produce the metal oxide and its density is measured. A desired density can then be achieved by using the amount of water of hydrolysis which corresponds to that density. Oxide powders with very high rate of sintering characteristics can be achieved by using at least 5 moles of water of hydrolysis per mole of alkoxide.

FINLEY-DIVIDED METAL OXIDES AND SINTERED OBJECTS THEREFROM

INORGANIC COMPOSITE STRUCTURES

INORGANIC COMPOSITE STRUCTURES This invention relates to a process of supercooling an inorganic particulate or a ceramic slurry containing a freeze sensitive ceramic colloidal sol and then freezing the slurry to cause spontaneous nucleation resulting in the formation of a very large number of ice crystals that are consequently very small thus producing a ceramic structure that is very uniform throughout. The invention includes the addition of lithium ions to the freezing media with or without supercooling. The invention further includes composite inorganic structures which are in the nature of laminates where at least one inorganic structure, such as a zirconia plate, is adhered to a different inorganic structure, such as an alumina plate.

PRODUCTION OF MATERIAL CONSISTING OF SOLID HOLLOW SPHEROIDS

PRODUCTION OF MATERIAL CONSISTING OF SOLID HOLLOW SPHEROIDS. Production of solid, hollow and spheroidic material for use as a carrier supporting motor exhaust gas decontamination catalysts. To this end, spheroidal particles of material being oxidizable and/or low melting and/or soluble in organic solvents are placed on to a pelletizing table. Ceramic pulverulent material is distributed thereover and a aqueous cellulose ether solution is simultaneously sprayed thereonto to cause precipitation of the ceramic material on the particles. The resulting pellets are dried at 20 - 95.degree.C and freed from material being oxidizable and/or low melting and/or solute organic solvents, and finally calcined at 1000 1500.degree.C.

GRANULAR PRODUCT

... ▓▓▓▓ Granular products with individual granules with virtually▓spherical particles of a homogeneous density distribution▓are produced by converting solids into suspensions,▓atomising the suspensions and drying them by sublimation▓drying.▓ ...

CERAMIC ELECTROLYTE COATING METHODS

Processes for preparing aqueous suspensions of a nanoscale ceramic electrolyte material such as yttrium-stabilized zirconia. The invention also includes a process for preparing an aqueous coating slurry of a nanoscale ceramic electrolyte material. The invention further includes a process for depositing an aqueous spray coating slurry including a ceramic electrolyte material on pre-sintered, partially sintered, and unsintered ceramic substrates and products made by this process.

PRODUCING COATED GRAPHITIC ANODE POWDERS BY EXTRACTING PITCH FROM HIGH VOLATILE MATTER COKE AND COATING THE SAME IN-SITU

This invention relates to a process for making carbon coated graphitic anode powders for use in batteries including rechargeable lithium ion batteries wherein the process includes a side product isotropic pitch for use as a precursor in other products and more preferably, as a coating material for other powder or particle products. The process includes the steps of solvent extraction of volatile materials from high volatile material green coke powder. When a desirable amount of the volatile materials have been extracted, the solvent strength is altered to cause some of the volatile materials to precipitate on the powder particles to coat the same. The coated and solvent extracted particles are then separated from the solvent and oxidatively stabilized, then carbonized and preferably graphitized. The volatile materials remaining in the solvent are valuable and are recovered for use in other processes and other products.

IMPROVED MIXED METAL OXIDE CRYSTALLINE POWDERS AND METHOD FOR THE SYNTHESIS THEREOF

A method for the synthesis of mixed metal oxide crystalline powders comprises the steps of preparing a raw material mixture containing at least two different metal cations; adding a template material to the mixture and blending it therewith; initiating formation of a mixed metal oxide by calcination of the mixture and the template material, whereby particles of the mixed metal oxides are formed; and thereafter recovering the mixed metal oxide particles. Mixed metal oxide crystalline powders comprise a template material; and metal oxides which form pigment classes of material containing the template material, the pigment classes being selected from the group consisting of borate, garnet, olivine, phenacite, phosphate, priderite, pyrochlore, sphene, spinet and zircon, as well as perovskite crystal classes of material containing the template, all of which have a uniform particle morphology and particle size ranging between about 0.2 to 100 with minimal comminution.

CHEMICAL VAPOR DEPOSITION OF MULLITE COATINGS AND POWDERS

This invention is directed to the creation of mullite coatings and powders having uniform microstructure by chemical vapor deposition (CVD). The process comprises the steps of establishing a flow of reactants which will yield mullite in a CVD reactor, and depositing a coating or the powder from the reactant flow. The process will yield coatings which are dense and of uniform thickness.

Procédé de préparation d'oxydes homogènes de plusieurs éléments sous forme divisée

Procédé de préparation d'un oxyde métallique finement divisé et produit obtenu

Process for the preparation of finely divided oxygenated metal compounds

A paper pulp is impregnated with an aqueous solution of one or a number of metal compounds, the impregnated pulp is dried and is ashed. The ash is collected and ground. Powdered oxygenated metal compounds of submicron fineness are obtained which, after compression and sintering, yield sintered articles of high mechanical strength and with a high specific surface, especially refractory articles made of stabilised zirconia and catalyst supports.

METHOD OF PRODUCING REFRACTORY GRAINS, CONTAINING CHROMIUM OXIDE (III)

METHOD FOR FORMATION OF PROPPANT MIXTURE, PROPPANT MIXTURE AND METHOD FOR PROPPING OF GEOLOGICAL FORMATION

BATCH COMPOSITION FOR PRODUCING AN UNSHAPED REFRACTORY CERAMIC PRODUCT, METHOD FOR PRODUCING A FIRED REFRACTORY CERAMIC PRODUCT, FIRED REFRACTORY CERAMIC PRODUCT, AND USE OF AN UNSHAPED REFRACTORY CERAMIC PRODUCT

SYSTEM AND METHODS FOR PREPARING CERAMIC POWDERS

Method for manufacturing refractory grains containing chromium(III) oxide

The invention relates to a method for manufacturing sintered refractory grains containing Cr2CO3 from an initial refractory product including one or more chromium oxides, all the dimensions of the starting refractory material being no lower than 1 mm, said method including the following steps, in the following order: A) optionally, a step of crushing the starting refractory material; B) grinding a filler to be ground, comprising said starting refractory material that was optionally crushed, in a liquid medium in order to obtain a suspension of particles of said starting refractory material, more than 80% of said particles, by weight percentage, having a size of less than 50 [mu]m; C) preparing a starting mixture including at least 1 wt% of particles of the suspension obtained during the preceding step; D) shaping the starting mixture into the shape of a preform; E) optionally drying the preform obtained in step D); F) sintering the preform so as to obtain a sintered body; G) optionally ...

For photoelectric use mixed bismith and copper oxide and sulfide

INORGANIC MATERIAL HAS STRUCTURE HIERARCHISEE, AND PROCEEDED FOR SA PREPARATION

METHOD OF PREPARATION Of a POWDER SUITED TO SINTERING, IN PARTICULAR Of a CERAMIC POWDER

PROCEDE ET APPAREIL POUR PREPARER UNE POUDRE CERAMIQUE

LE PROCEDE CONSISTE A ATOMISER EN PRESENCE D'EAU DES SUBSTANCES QUI PRODUISENT PAR HYDROLYSE DES OXYDES, HYDROXYDES OU HYDRATES METALLIQUES OU NON METALLIQUES, PUIS A CALCINER LES PRODUITS OBTENUS DANS DES CONDITIONS D'ATOMISATION. L'APPAREIL CORRESPONDANT COMPREND UNE SECTION D'HYDROLYSE ET D'ATOMISATION AU MOYEN D'UNE BUSE ET UNE SECTION DE CALCINATION, LA CALCINATION INTERVENANT EN MEME TEMPS QUE L'ATOMISATION. LES SUBSTANCES ATOMISEES SONT COMPLETEMENT HYDROLYSEES AVANT QU'UNE DECOMPOSITION THERMIQUE PUISSE INTERVENIR.

Prep of finely divided amorphous mixture of oxides - of various elements

DEVICE AND PROCESS OF DEPOSIT Of a MIXTURE OF POWDERS FOR the FORMATION Of an OBJECT HAVE GRADIENTS OF COMPOSITION

Powder preparation used in sintered compacts mfr. - obtd. by spraying a soln. of accurate stoichiometry, cooling rapidly to gelation temp. and lyophilising

FINELY-DIVIDED METAL OXIDES AND SINTERED OBJECTS THEREFROM

Process for the synthesis of antimony polyphosphate of high purity by the reaction of antimony(III) oxide with phosphoric acid milled to a fine suspension

Procédé de fabrication du polyphosphate d'antimoine de haute pureté à partir d'oxyde d'antimoine (III) et d'acide phosphorique. Les étapes du procédé comportent le broyage jusqu'à la formation d'une fine suspension, le chauffage de cette suspension pour réaliser sa transformation en polyphosphate d'antimoine et le chauffage final du produit.

FIRE-RESISTANT FILLER POWDER, ADHESIVE MATERIAL, AND METHOD FOR PRODUCING FIRE-RESISTANT FILLER POWDER

MOLTEN POWDER OF YTTRIA-STABILISED ZIRCONIA

Sinterable silicon carbite powder and silicon carbite ceramic sintered product

Provided are a readily sinterable silicon carbide powder which has a substantially stoichiometric composition and from which a fine sintered body is obtained, a silicon carbide ceramic sintered body having low resistivity, and a method for manufacturing the same. In this readily sinterable silicon carbide powder, the carbon/silicon elemental ratio is 0.96 to 1.04, the average particle diameter is 1.0 to 100 [mu]m, and the ratio of the integrated absorption intensity in the chemical shift range of 0 to 30 ppm to the integrated absorption intensity in the range of 0 to 170 ppm is 20% or less in the 13C-NMR spectrum. By sintering the silicon carbide powder under pressure, a fine sintered body can be produced which has low resistivity and high purity.

Injection molding apparatus and injection molding method

An injection molding apparatus including a mold, an injection device and a gas supply device is provided. The injection device is adapted to inject a ceramic powder material into the mold. The gas supply device is adapted to provide a gas into the mold to form a cavity in the ceramic powder material by the gas. In addition, an injection molding method is also provided.

METHOD OF FABRICATING SILICON CARBIDE

A method of fabricating silicon carbide according to the embodiment comprises the steps of preparing a mixture by mixing a silicon source comprising silicon with a solid carbon source or a carbon source comprising an organic carbon compound; supplying binder into the mixture to granulate the mixture; and reacting the granulated mixture.

METHODS OF FORMING LEAD ZIRCONATE TITANATE NANOPARTICLES

Methods for forming lead zirconate titanate (PZT) nanoparticles are provided. The PZT nanoparticles are formed from a precursor solution, comprising a source of lead, a source of titanium, a source of zirconium, and a mineraliser, that undergoes a hydro thermal process. The size and morphology of the PZT nanoparticles are controlled, in part, by the heating schedule used during the hydro thermal process.

ZIRCONIA PARTICLES

Porous zirconia or zirconium-containing particles, methods of making such particles and methods of using such particles including modifications to the surface of the particles are described. The method comprises heating zirconia particles to provide a substantially homogeneously liquid melt, quenching the particles of melt to effect spinodal decomposition to provide quench particles of a silica rich phase and a zirconia rich phase, annealing the quenched particles to provide non porous solid particles of zirconia and silica and, leaching the silica from these particles to produce porous solid zirconia particles comprising a three dimensionally substantially continuous inter penetrating network of interconnected pores.

HIGHLY FILLED SiO¿2 DISPERSION, METHODS FOR THE PRODUCTION THEREOF AND ITS USE

L'invention concerne des dispersions de SiO¿2 à haut coefficient de charge, des procédés permettant de les préparer et des procédés permettant de produire des corps moulés en SiO¿2 poreux amorphes à coefficients de charge extrêmement élevés. Dans le cas de la dispersion selon l'invention, il s'agit d'une dispersion homogène très coulante de particules de SiO¿2 amorphes dans un agent dispersant, qui se caractérise en ce qu'elle présente un coefficient de charge d'au moins 80 % en poids de particules de SiO¿2 et en ce que les particules de SiO¿2 amorphes ont une répartition granulométrique bimodale.

Process for producing finely divided powdery metal oxide compositions

A finely divided metal oxide powdery composition, preferably with a narrow particle size distribution, is produced from a particulate, sol-gel derived composition containing agglomerates by heating the particulate composition in the presence of an effective amount of a composition which decomposes upon heating and forms a gas to break at least a portion of the agglomerates so as to yield the desired finely divided ceramic particle composition. Examples of suitable gas-forming agents for use in the present invention include the ammonium salts or amides of organic and inorganic acids, volatile acids, and gases dissolved in a suitable solvent, such as water, alcohol or ammonia.

Dried emulsion ceramic process

Dried emulsion of precursors for ceramic additives are added to paints containing fine particle ceramic materials for use in ceramic capacitors. The precursors are converted into the desired additives in the paints during the sintering of the capacitor bodies.

Method for the forming of ceramic green parts

The well known slip casting process for the production of ceramic green parts, in which hardening is achieved by water removal with porous molds, is characterized by disadvantages in terms of strength, shrinkage during drying and problems with cracking during drying. The present invention avoids these disadvantages and produces ceramic green parts by changing the surface potential of powder particles in the slip instead of by removing water. Further more the coagulation strength is increased by adding polymers or extremely fine divided colloidal particles.

Method of manufacturing a fine monodisperse oxide powder, a fine monodisperse oxide powder, a ceramic composition and their use of same

Fine, monodisperse oxide powders can be manufactured by means of a method which does not require expensive production facilities, in which method a graphite intercalation compound is manufactured by reacting one or more chemical starting compounds of one or more elements of the groups Ib, IIa, IIb, IIIa, IIIb, IVa, IVb, Va, Vb, VIa, VIb, VIIb, VIII of the periodic table as well as of the lanthanides and actinides with a graphitic carbon modification having a grain size Подробнее

Method for preparing carbon-containing composition

A method for preparing a carbon-containing composition is disclosed which comprises the steps of introducing, into a hot gas, a dispersion obtained by dispersing, in a decomposable carbon compound, a metal oxide and/or a metal compound which can be converted into the metal oxide by heating, to form a carbon-containing composition containing simple carbon and the corresponding metal oxide; and then collecting the formed carbon-containing composition. This carbon-containing composition is useful for the manufacture of a ceramic powder for sintering.

PROCESS FOR PRODUCING SIO2 MOULDINGS

The present invention relates to a process for producing SiO2 mouldings, comprising the preparation of a free-flowing aqueous SiO2 composition, solidification of the aqueous SiO2 composition and drying of the solidified SiO2 composition, wherein the aqueous SiO2 composition is a self-assembly composition. The present invention further relates to a moulding obtainable by the process according to the invention.

Method for producing cubic boron nitride abrasive grains

The present invention relates to a method for producing cubic boron nitride abrasive grains used for producing a grinding wheel, etc., and to cubic boron nitride abrasive grains. The method comprises maintaining a mixture containing hexagonal boron nitride and seed crystals of cubic boron nitride under pressure and temperature conditions where cubic boron nitride remains thermodynamically stable, characterized in that the seed crystals contain cubic boron nitride twin crystals.

Emulsion-char method for making fine ceramic powders

Water soluble precursors of ceramic compounds are emulsified in an organic fluid containing an organic surfactant. The emulsion is subsequently mildly heated at a pressure of about 0.05 atmospheres to remove the free water from the emulsion droplets. The resulting sludge consists of particles deriving from the dehydrated emulsion droplets. These particles may only be bound by the surfactant, all or most of the original organic fluid having been boiling off under low pressure. This sludge is then heated in a standard air atmosphere to char the surfactant, which char is to maintain the separation between the dried droplet-derived particles to prevent forming sintered or fused agglomerates thereof. With continued heating the transient char is subsequently burned off and the particles are calcined to controllably and simply produce a fine ceramic powder of spherical particles having a narrow size distribution and an average size in the particularly useful range of 0.1 micron to 1.0 micron.

Process for the production of homogeneous finely divided ceramic powders

Granular inorganic moldings and a process for production thereof

According to the present invention, there can be provided granular inorganic moldings characterized in that the ratio A/D of the maximum diameter D and the maximum length A perpendicular to the maximum diameter of the granular molding is 0.5 to 0.9 and in that at least 80% of the granular moldings have a shape such that the crossing point of A and D is within 0.3 D from both sides of the center of D. Such moldings can be obtained in a high yield by filling an inorganic powder capable of calcination into an organic porous body having a 3-dimensional net-like structure and subjecting it to press forming thereby to form granules of the inorganic powder in the pores of the porous body and then burning off the organic porous body and at the same time, calcining the granular moldings. The granular inorganic moldings are useful e.g. as bone fillers.

Method for controlling firing shrinkage of ceramic green body

A method of preparing a fired ceramic powder body, includes the steps of: (i) molding a ceramic powder (A) having a spherical diameter (Rs) of 1 um or less wherein the spherical diameter (Rs) is expressed by an equation: Rs (um) = 6/ ¿ s, in which ¿ is a true density (g/cm3) of a powder, and S is a BET specific surface area of a powder, and an average degree of aggregation (x) of 2 to 10 wherein the average degree of aggregation (x) is expressed by equation: x = Rm/Rs, in which Rm is a median diameter observed by a laser scattering method and Rs is a spherical diameter as being defined above; (ii) firing the green body at a predetermined firing temperature; the method further comprising controlling the amount of firing shrinkage during the firing step (ii) to a desired value A1 by heat treating the powder at a temperature T1 that provides the firing shrinkage A1 at the predetermined firing temperature, the temperature T1 being determined based on an established correlation between an amount ...

Process for the production of homogeneous finely divided ceramic powders

The invention relates to a process for the preparation of a homogeneous, finely divided ceramic powder, in which a) a solution or a suspension of substances from which the constituents of the ceramic powder are formed is prepared, b) the solution or suspension is sprayed through a nozzle into a heatable reactor, c) the solvent or suspending agent is evaporated in the reactor and solid residue particles to form, which are dried and converted into the constituents of the ceramic powder by a decomposition reaction or another chemical reaction. It is an object of the invention to indicate a process for the preparation of a finely divided and homogeneous ceramic powder which is crystalline and virtually free from water. The properties of this powder do not depend on the nature of the metal ions employed. In the process, the evaporation of the solvent or suspending agent, the drying and the calcination of the resultant residue particles and their chemical conversion into the desired ceramic proceed ...

Powder of coagulated spherical zirconia particles and process for producing them

Silicon aluminium mixed oxide

ПЛОТНЫЙ СПЕЧЕННЫЙ ПРОДУКТ

Изобретение относится к спечённому продукту, имеющему ширину более 50 мм, относительную плотность более 90%, состоящему более чем на 80% объема из уложенных друг на друга в горизонтальном положении керамических пластинок, где совокупность указанных пластинок имеет среднюю толщину менее 3 мкм, и содержащему более 20 мас.% оксида алюминия в расчете на массу продукта. Продукт имеет трещиностойкость более 3,5 МПа⋅м1/2и ударную вязкость более 8 МПа⋅м1/2. Продукт получают из шликера, содержащего совокупность керамических частиц, диспергированных в жидкой фазе, при этом первая фракция частиц в виде пластинок, имеющих длину больше 1 мкм, составляет более 80 об.% керамических частиц в составе шликера. Вторая фракция составляет более 1 об.% керамических частиц, при этом вторая фракция частиц имеет медианную длину менее 1 мкм, и медианная длина частиц второй фракции по крайней мере в 10 раз меньше, чем медианная длина частиц первой фракции. Шликер замораживают, удаляют кристаллы льда, формуют промежуточный ...

Микропористый керамический распылительный сердечник и способ его изготовления

Изобретение относится к микропористому керамическому распылительному сердечнику, который представляет собой основной компонент в области распыления в составе электронных сигарет. Микропористый распылительный сердечник содержит исходные материалы в следующем соотношении: от 10 до 50 массовых частей основного материала, от 0 до 40 массовых частей керамического порошка, от 10 до 50 массовых частей спекающей добавки, от 0 до 20 массовых частей порообразующего агента, от 20 до 50 массовых частей парафина и от 0,1 до 2,0 массовых частей поверхностно-активного вещества. Основной материал содержит по меньшей мере одно из следующего: аэрогелевый порошок диоксида кремния и пористый нитрид бора, причем основной материал имеет размер частиц от 200 до 1500 меш. Спекающая добавка представляет собой оксид металла или стеклянный порошок, причем размер частиц составляет от 200 меш до 2000 меш, а начальная температура плавления составляет от 300°С до 600°С. Для изготовления керамического сердечника компоненты ...

ОГНЕУПОРНОЕ КЕРАМИЧЕСКОЕ ИЗДЕЛИЕ, ШИХТА ДЛЯ ИЗГОТОВЛЕНИЯ ТАКОГО ИЗДЕЛИЯ, А ТАКЖЕ СПОСОБ ИЗГОТОВЛЕНИЯ ТАКОГО ИЗДЕЛИЯ

Способ получения пористой спеченной магнезии, шихты для получения грубокерамического огнеупорного изделия с зернистым материалом из спеченной магнезии, изделия такого рода, а также способы их получения, футеровки промышленной печи и промышленная печь

СПОСОБ ПОЛУЧЕНИЯ ЛЮМИНЕСЦЕНТНОЙ КЕРАМИКИ НА ОСНОВЕ СЛОЖНЫХ ОКСИДОВ СО СТРУКТУРОЙ ГРАНАТА

Сложный германат натрия и лантана состава NaLa9(GeO4)6O2 в качестве шихты для получения оптически прозрачной керамики и способ получения оптически прозрачной керамики

Изобретение относится к области получения оптически прозрачной керамики со структурой апатита, которая может быть использована как материал для оптических линз, а также функциональный материал-носитель для устройств оптоэлектроники и фотоники, таких как лазеры и белые светоизлучающие диоды (WLEDs). Нанопорошок сложного германата натрия лантана состава NaLa9(GeO4)6O2 используют в качестве шихты для получения оптически прозрачной керамики. Способ получения оптически прозрачной керамики на основе сложного германата натрия лантана состава NaLa9(GeO4)6O2, включает горячее прессование нанопорошка состава NaLa9(GeO4)6O2 при давлении 2-8 ГПа, при температуре 600-610°С в течение 10-20 мин со скоростью подъема температуры 100-110°С/мин, а затем закалку путем резкого понижения температуры до комнатной. Полное светопропускание полученной прозрачной керамики NaLa9(GeO4)6O2 при длине волны 500 нм (видимый спектральный диапазон) составляет 55%, при длине волны 1200 нм (ИК-диапазон) - 74%. Технический ...

Verfahren zur Herstellung eines keramischen Sinterkörpers aus granuliertem Formpulver

Verfahren zum Kontrollieren der Sinterschrumpfung eines keramischen Grünkörpers

Kompositwerkstoff auf Siliciumcarbidbasis und Herstellungsverfahren dafür

Verfahren für die Herstellung poröser Granulatteilchen aus anorganischem Werkstoff sowie deren Verwendung

Zur Herstellung von Granulatteilchen aus porösem anorganischem Werkstoff sind Aufbau- und Pressgranulationsverfahren allgemein bekannt. Um eine kostengünstige und gleichzeitig reproduzierbarere Herstellung von porösem Granulat zu ermöglichen, das eine stärkere Ausprägung einer hierarchischen Porenstruktur aufweist, wird ein Verfahren vorgeschlagen, dass die folgenden Verfahrensschritte umfasst: (a) Zuführen eines Einsatzmaterial-Stroms zu einer Reaktionszone, in der das Einsatzmaterial durch Pyrolyse oder durch Hydrolyse zu Werkstoff-Partikeln umgesetzt wird, (b) Abscheiden der Werkstoff-Partikel auf einer Ablagerungsfläche unter Bildung einer Sootschicht, (c) Thermisches Verfestigen der Sootschicht zu einer porösen Sootplatte, und (d) Zerkleinern der Sootplatte zu den porösen Granulatteilchen.

Vorrichtung und Verfahren zum tiegelfreien Schmelzen eines Materials und zum Zerstäuben des geschmolzenen Materials zum Herstellen von Pulver

Vorrichtung (1) zum tiegelfreien Schmelzen eines Materials und zum Zerstäuben des geschmolzenen Materials zum Herstellen von Pulver, umfassend:eine Zerstäubungsdüse (5);eine Induktionsspule (4) mit Windungen (4a-d), die in Richtung auf die Zerstäubungsdüse (5) wenigstens abschnittweise enger werden; undeinen wenigstens teilweise in die Induktionsspule (4) eingeführten Materialstab (3);wobei die Induktionsspule (4) eingerichtet ist, das Material des Materialstabes (3) zum Erzeugen eines Schmelzestromes (16) zu schmelzen; undwobei die Induktionsspule (4) und die Zerstäubungsdüse (5) derart angeordnet sind, dass der Schmelzestrom (16) zum Zerstäuben des Schmelzestromes (16) mittels eines Zerstäubungsgases (19), das in die Zerstäubungsdüse (5) einleitbar ist, durch eine erste Öffnung (20) der Zerstäubungsdüse (5) in die Zerstäubungsdüse (5) einführbar ist oder eingeführt wird;wobei die Zerstäubungsdüse (5) und die Induktionsspule (4) als separate Bauteile ausgeführt sind und die Induktionsspule ...

Method and apparatus associated with anisotropic shrink in sintered ceramic items

A manufacturing method for producing ceramic item from a photocurable ceramic filled material by stereolithography. The method compensates for the anisotropic shrinkage of the item during firing to produce a dimensionally accurate item.

Phosphor, production method thereof and light emitting instrument

A light emitting element includes a light-emitting source for emitting light at a wavelength of 330 to 500 nm and a constituent phosphor. The constituent phosphor includes a compound including M, A, Al, O, and N, where M is at least one kind of element selected from Mn, Ce, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb, and A is at least one kind of element selected from C, Si, Ge, Sn, B, Ga, In, Mg, Ca, Sr, Ba, Sc, Y, La, Gd, Lu, Ti, Zr, Hf, Ta, and W.

Cubic boron nitride compact

A CBN compact which contains CBN and a matrix phase, wherein the CBN grain size volume frequency distribution has a distribution spread expressed as d90-d10 of 1 micron or greater, and the d90 maximum value is 5 micron or less.

Process And Apparatus For Manufacturing Ceramic Honeycombs

Methods and apparatus for making ceramic honeycombs by steps including compounding a plasticized ceramic batch mixture and forming the mixture into ceramic honeycombs by continuous extrusion, drying and firing, wherein one or more ceramic powders for the batch mixture are supplied by in-line homogenization as a powder feed having a median particle size D 50 that varies from a maximum value to a minimum value by an amount not exceeding 15% of the maximum value during a 24-hour period of continuous extrusion.

Method for producing alkali metal niobate particles, and alkali metal niobate particles

Disclosed are a method of producing fine particulate alkali metal niobate in a liquid phase system, wherein the size and shape of particles of the fine particulate alkali metal niobate can be controlled; and fine particulate alkali metal niobate having a controlled shape and size. Specifically disclosed are a method of producing particulate sodium-potassium niobate represented by the formula (1): Na x K (1-x) NbO 3 (1), the method including four specific steps, wherein a high-concentration alkaline solution containing Na + ion and K + ion is used as an alkaline solution; and particulate sodium-potassium niobate having a controlled shape and size.

Refractory material with stainless steel and organic fibers

A refractory includes a cement, a binder and a matrix. The matrix comprises both stainless steel fibers and organic fibers. The refractory can be easily cast, without additional steel reinforcement, into large fire wall 16 panels 10 capable of meeting the requirements of testing conducted in accordance with ASTM E-119, Standard Test Methods for Fire Tests of Building Construction and Materials in support of IEEE Std. 979-1994, Guide for Substation Fire Protection . The fire wall 16 assembly withstood the fire endurance test without passage of flame and gases hot enough to ignite cotton waste during a four-hour fire exposure. The assembly also withstood a 45 psi water stream for five minutes immediately following the four-hour fire exposure period. This is a stringent mechanical requirement, as all fire walls 16 must maintain their integrity before, during and after a fire, per the Universal Building Code's definition of a true fire wall 16.

Apparatus for pitch densification

A pitch densification apparatus may be used to form a carbon-carbon composite material. In some examples, the apparatus is configured to pitch densify a material using one or more of a plurality of different pitch densification techniques. For example, the apparatus may densify a material with a selectable one of the resin transfer molding cycle, the vacuum-assisted resin transfer molding cycle, and/or the vacuum pressure infiltration cycle. The apparatus may respond to initial or changing properties of a material to be densified. In some additional examples, the apparatus includes a mold configured to receive a preform and a portion of solid pitch separate from the preform. The apparatus may include a heating source thermally coupled to the mold that is configured to heat the solid pitch above a melting temperature of the solid pitch. The apparatus may melt the pitch without external pitch melting equipment.

Green emitting material

The invention relates to an improved green emitting material of the form M I 3-x-y M II x Si 6-x Al x O 12 N 2 :Eu y , whereby M I is an earth alkali metal and M II is a rare earth metal or Lanthanum. This material can be made as a ceramic using a low temperature sintering step, resulting in a better and more uniform ceramic body.

Dielectric composition having high dielectric constant, multi layered ceramic condensers comprising the same, and method of preparing for multi layered ceramic condensers

A dielectric composition having a high dielectric constant, multi layered ceramic condensers comprising the same, and a method of preparing for multi layered ceramic condensers. The dielectric composition includes: a compound represented by general formula (Ba 1-X Ca x ) m (Ti 1-y Zr y )O 3 (0.995≦m≦1.010, 0.001≦x≦0.10, 0.001, 0.001≦y≦0.20) as a main component; an Al oxide as a first sub-component; at least one metal selected from a group consisting of Mg, Sr, Ba, Ca, and Zr and the salt thereof, as a second sub-component; at least one metal selected from a group consisting of Sc, Y, La, Ac, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu and the salt thereof, as a third sub-component; at least one metal selected from a group consisting of Cr, Mo, W, Mn, Fe, Co, and Ni and the salt thereof, as a fourth sub-component; and a fifth sub-component selected from Si containing glass forming compounds.

Optical material and optical element

An optical element is formed by vacuum-sintering a molded body of ceramic particles having an average particle diameter of 1 μm or more and 10 μm or less and including Ln x Al y O [x+y]×1.5 (Ln represents a rare-earth element, 1≦x≦10, and 1≦y≦5). Ln preferably includes at least one kind selected from La, Gd, Yb, and Lu. The optical element preferably has a refractive index of 1.85 or more and 2.06 μm or less, and an Abbe number of 48 or more and 65 or less. The obtained optical element has optical properties of high refractive index and low dispersibility.

Shaded zirconium oxide articles and methods

A dental article includes yttria stabilized tetragonal zirconia polycrystalline ceramic, and no more than about 0.15 wt. % of one or more coloring agents of one or more of: Pr, Tb, Cr, Nd, Co, oxides thereof, and combinations thereof, whereby the dental article is provided with a color corresponding to a natural tooth shade; and wherein the dental article has a flexural strength of at least about 800 MPa. Corresponding methods are also described.

Carbon Nanotube Ink

Carbon nanotube inkjet solutions and methods for jetting are described.

Self-Toughened High-Strength Proppant and Methods Of Making Same

Methods are described to make strong, tough, and lightweight whisker-reinforced glass-ceramic composites through a self-toughening structure generated by viscous reaction sintering of a complex mixture of oxides. The present invention further relates to strong, tough, and lightweight glass-ceramic composites that can be used as proppants and for other uses.

Low expansion corrosion resistant ceramic foam filters for molten aluminum filtration

A ceramic foam filter for molten aluminum alloys comprising an alumina silicate rich core and a boron glass shell and a chemical composition comprising: 20-70 wt % Al 2 O 3 , 20-60 wt % SiO 2 , 0-10 wt % CaO, 0-10 wt %; MgO and 2-20 wt % B 2 O 3 .

High-purity fused and crushed zirconia alloy powder and method of producing same

The present invention provides a high-purity fused and crushed stabilized zirconia powder. The powder—with or without further processing, such as plasma spheroidization—is used in thermal spray applications of thermal barrier coatings (TBCs) and high-temperature abradables. The resulting coatings have a significantly improved high temperature sintering resistance, which will enhance the durability and thermal insulation effect of the coating.

Extrusion Process For Proppant Production

An extrusion method and apparatus are described for producing ceramics, glass, glass-ceramics, or composites suitable for use as proppants. The method includes forming one or more green body materials, extruding the green body materials to form a green body extrudate, separating and shaping the green body extrudate into individual green bodies, and sintering the green bodies to form proppants. The apparatus includes a means for forming an intimate mixture of green body materials, means to produce a green body extrudate, means for separating and shaping the green body extrudate into individual green bodies, and means to sinter the green green bodies to form proppants.

Silicon carbide powder composition and method of producing silicon carbide molded product using same

A silicon carbide powder composition comprising a silicon carbide powder obtained by thermally decomposing a silicone cured product within a non-oxidizing atmosphere and an organic binder. The composition can be sintered to form a silicon carbide molded product having a complex shape even without the inclusion of a sintering assistant.

Method for producing perovskite type composite oxide

A method is provided which includes a reaction step of reacting at least titanium oxide, a calcium compound, and barium hydroxide in a slurry solution so as to produce a perovskite-type composite oxide. The perovskite-type composite oxide is represented by (Ba 1-x Ca x ) m TiO 3 , and x is within a range of 0<x≦0.125. In addition, the method provides a perovskite-type composite oxide in which a water-soluble calcium compound is used as the calcium compound, and when the perovskite-type composite oxide is represented by (Ba 1-x Ca x ) m TiO 3 , x is within a range of 0<x≦0.20.

Transparent alumina ceramics with oriented grains and preparation method thereof

A kind or transparent alumina ceramics is disclosed herein, the optical axes of all or part or the crystal grains of the transparent alumina ceramics are arranged in a direction, which makes the transparent alumina ceramics have orientation.

Ceramic material, laminate, member for use in semiconductor manufacturing equipment, and sputtering target member

A ceramic material mainly contains magnesium, aluminum, oxygen, and nitrogen, in which the ceramic material has a magnesium-aluminum oxynitride phase serving as a main phase, wherein XRD peaks of the magnesium-aluminum oxynitride phase measured with CuKα radiation appear at at least 2θ=47 to 50°.

Process for production of scandia-stabilized zirconia sheet, scandia-stabilized zirconia sheet obtained by the process, and scandia-stabilized zirconia sintered powder

The process for production of a scandia-stabilized zirconia sheet according to the present invention is characterized in comprising the steps of pulverizing a scandia-stabilized zirconia sintered body to obtain a scandia-stabilized zirconia sintered powder having an average particle diameter (De) determined using a transmission electron microscope of more than 0.3 μm and not more than 1.5 μm, and an average particle diameter (Dr) determined by a laser scattering method of more than 0.3 μm and not more than 3.0 μm, and a ratio (Dr/De) of the average particle diameter determined by the laser scattering method to the average particle diameter determined using the transmission electron microscope of not less than 1.0 and not more than 2.5; preparing a slurry containing the scandia-stabilized zirconia sintered powder and a zirconia unsintered powder, wherein a percentage of the scandia-stabilized zirconia sintered powder to a sum of the scandia-stabilized zirconia sintered powder and the zirconia unsintered powder in the slurry is not less than 2 mass % and not more than 40 mass %; forming the slurry into a greensheet; and sintering the greensheet.

Method for producing electrostatic chuck and electrostatic chuck

A method for producing an electrostatic chuck 10 includes the steps of (a) pouring a ceramic slurry containing a ceramic powder, a solvent, a dispersant, and a gelling agent into a first molding die 31 in which an electrostatic electrode precursor 24 is removably attached to an inner surface of the first molding die 31 , gelatinizing the ceramic slurry by causing a chemical reaction of the gelling agent, and then removing the first molding die 31 to prepare an embedded-electrode-containing ceramic molded body 41 X in which the electrostatic electrode precursor 24 is embedded in a first ceramic molded body 41 ; (b) preparing a second ceramic molded body 42 ; and (c) preparing a stacked calcined body 50 using the embedded-electrode-containing ceramic molded body 41 X and the second ceramic molded body 42 , and conducting hot-press firing of the stacked calcined body 50.

Coating compositions

Silicon nitride coated crucibles for holding melted semiconductor material and for use in preparing multicrystalline silicon ingots by a directional solidification process; methods for coating crucibles; methods for preparing silicon ingots and wafers; compositions for coating crucibles and silicon ingots and wafers with a low oxygen content.

Metalorganic chemical vapor deposition (mocvd) process and apparatus to produce multi-layer high-temperature superconducting (hts) coated tape

An MOCVD apparatus and process for producing multi-layer HTS-coated tapes with increased current capacity which includes multiple liquid precursor sources, each having an associated pump and vaporizer, the outlets of which feed a multiple compartment showerhead apparatus within an MOCVD reactor. The multiple compartment showerhead apparatus is located in close proximity to an associated substrate heater which together define multiple deposition sectors in a deposition zone.

Methods for making aluminum nitride armor bodies

A method of making aluminum nitride armor bodies is provided. The method starts with low cost bulk raw material, in the form of aluminum or aluminum alloy, cryogenically mills the raw material into a precursor powder, which is essentially free of oxides and other undesirable impurities. The precursor powder is formed into a pre-form using low cost, short residence time molding processes. Finally, the pre-form is exposed to a nitriding process to convert the pre-form into the aluminum nitride armor body. In this manner, the method avoids the use of high cost aluminum nitride as a starting material and avoids the need for the high cost, single axis densification processes of the prior art.

Ceramic Honeycomb Structure Skin Coating

A porous ceramic (honeycomb) structure skin coating and a method of producing a porous ceramic structure skin coating which provides a hardshell, strong, acid- and alkali-resistant, chip-resistant ceramic honeycomb structure coating which resists pollution control catalyst from being absorbed into the skin coating.

Composite Material of Electroconductor Having Controlled Coefficient of Thermical Expansion

The present invention relates to a composite material comprising a ceramic component, characterized in that it has a negative coefficient of thermal expansion, and carbon nanofilaments, to its obtainment process and to its uses as electrical conductor in microelectronics, precision optics, aeronautics and aerospace.

Carrier core particles for electrophotographic developer, method for manufacturing the same, carrier for electrophotographic developer and electrophotographic developer

The carrier core particles 11 for electrophotographic developer contain lithium as a core composition. When the carrier core particles 11 are immersed in pure water at a weight ratio of 1 part core particles 11 to 10 parts pure water and shaken, the amount of lithium that leaches out to the pure water is 0.10 ppm or lower.

MANUFACTURING METHOD FOR LiCoO2, SINTERED BODY AND SPUTTERING TARGET

Provided is a method for stably manufacturing high-density sintered LiCoO 2 . Said method uses a CIP-and-sintering method, which has a forming step using cold hydrostatic pressing and a sintering step. The pressing force is at least 1000 kg/cm 2 , the sintering temperature is between 1050° C. and 1120° C., and the sintering time is at least two hours. This makes it possible to stably manufacture sintered LiCoO 2 with a relative density of at least 90%, a resistivity of at most 3 kΩ·cm, and a mean grain diameter between 20 and 50 μm.

SOLUTION-BASED SYNTHESIS OF CsSnI3

This invention discloses a solution-based synthesis of cesium tin tri-iodide (CsSnI 3 ) film. More specifically, the invention is directed to a solution-based drop-coating synthesis of cesium tin tri-iodide (CsSnI 3 ) films. CsSnI 3 films are ideally suited for a wide range of applications such as light emitting and photovoltaic devices.

Method for manufacturing ceramic product

A method for manufacturing a ceramic product without a sintering process, which requires no removal of binder to ensure favorable brittle fracture resistance of the ceramic product. The method includes mixing a ceramic powder with an additive and a binder to prepare a ceramic powder mixture, and treating the ceramic powder mixture through vacuum vibration pressing, to thereby form a ceramic product. The ceramic powder may include a fused ceramic powder prepared by heating the ceramic material to a melting point of the ceramic material or higher to fuse the same, cooling the fused material, and milling the cooled material.

Luminescent particles, methods and light emitting devices including the same

A luminescent particle includes an interior portion of the luminescent particle comprising a luminescent compound that reacts with atmospherically present components and a passivating layer on an outer surface of the luminescent particle that is operable to inhibit the reaction between the luminescent compound and the atmospherically present components.

Filtering structure, including plugging material

Filter structure of the honeycomb type for filtering particulate-laden gases, said structure being characterized in that: a) the filtering walls of said honeycomb structure are made of a material having, after firing, an average thermal expansion coefficient, measured between 25 and 1100° C., of less than 2.5×10 −6 K −1 ; and b)the material constituting the plugs comprises: a filler formed from refractory grains, the melting temperature of which is above 1500° C., and the median diameter of which is between 5 and 50 microns; and a glassy binder phase.

Multiple inorganic compound structure and use thereof, and method of producing multiple inorganic compound structure

In a multiple inorganic compound structure according to the present invention, elements included in a main crystalline phase and elements included in a sub inorganic compound are present in at least a first region and a second region, the first region and the second region each have an area of nano square meter order, the first region is adjacent to the second region, and the first region and the second region each include an element of an identical kind, which element of the identical kind present in the first region has a concentration different from that of the element of the identical kind present in the second region.

Process for producing zinc oxide varistor

A process for producing zinc oxide varistors possessed a property of breakdown voltage (V1mA) ranging from 230 to 1,730 V/mm is to perform the doping of zinc oxide and the sintering of zinc oxide grains with a high-impedance sintered powder through two independent procedures, so that the doped zinc oxide and the high-impedance sintered powder are well mixed in a predetermined ratio and then used to make the zinc oxide varistors through conventional technology by low-temperature sintering (lower than 900° C.); the resultant zinc oxide varistors may use pure silver as inner electrode and particularly possess breakdown voltage ranging from 230 to 1,730 V/mm.

Corrosion-resistant member for semiconductor manufacturing apparatus and method for manufacturing the same

A mixed powder was prepared by weighing Yb 2 O 3 and SrCO 3 in such a way that the molar ratio became 1:1. The resulting mixed powder was subjected to uniaxial pressure forming, so as to produce a disc-shaped compact. The compact was heat-treated in an air atmosphere, so that a complex oxide was synthesized. The resulting complex oxide was pulverized. After the pulverization, a slurry was taken out and was dried in a nitrogen gas stream, so as to produce a synthesized powder material. The resulting synthesized powder material was subjected to uniaxial pressure forming, so as to produce a disc-shaped compact. The resulting compact was fired by a hot-press method, so as to obtain a corrosion-resistant member for semiconductor manufacturing apparatus. The resulting corrosion-resistant member was made from a SrYb 2 O 4 .

Process for preparing high-purity magnesium hydroxide and magnesium oxide

A process for preparing magnesium compounds by precipitation, in which an aqueous solution or suspension of a magnesium compound is mixed with a precipitant and the corresponding magnesium compound is precipitated wherein the aqueous solution or suspension of a magnesium compound is obtained by reaction of an organomagnesium compound with an aldehyde or a ketone or another electrophile and subsequent aqueous workup of the reaction mixture at a pH of at most 10 or from a magnesium salt with a maximum calcium content and/or potassium content of 200 ppm, based on the magnesium salt used.

Nanostructured dielectric materials for high energy density multilayer ceramic capacitors

A multilayer ceramic capacitor, having a plurality of electrode layers and a plurality of substantially titanium dioxide dielectric layers, wherein each respective titanium dioxide dielectric layer is substantially free of porosity, wherein each respective substantially titanium dioxide dielectric layer is positioned between two respective electrode layers, wherein each respective substantially titanium dioxide dielectric layer has an average grain size of between about 200 and about 400 nanometers, wherein each respective substantially titanium dioxide dielectric layer has maximum particle size of less than about 500 nanometers. Typically, each respective substantially titanium dioxide dielectric layer further includes at least one dopant selected from the group including P, V, Nb, Ta, Mo, W, and combinations thereof, and the included dopant is typically present in amounts of less than about 0.01 atomic percent.

Solid electrolyte material and lithium battery

A main object of the present invention is to provide a Li—La—Zr—O-based solid electrolyte material having favorable denseness. The present invention solves the problem by providing a solid electrolyte material including Li, La, Zr, Al, Si and O, having a garnet structure, and being a sintered body.

INORGANIC FIBROUS MOLDED REFRACTORY ARTICLE, METHOD FOR PRODUCING INORGANIC FIBROUS MOLDED REFRACTORY ARTICLE, AND INORGANIC FIBROUS UNSHAPED REFRACTORY COMPOSITION

An inorganic fibrous shaped refractory article having a high bio-solubility which is capable of exhibiting a desired heat resistance without containing expensive ceramic fibers, alumina powder and silica powder can be provided at a low production cost and with a low product price. 1. An inorganic fibrous shaped refractory article comprising materials comprising 2 to 95 mass % of rock wool , 2 to 95 mass % of inorganic powder having a needle-like crystal structure and 3 to 32 mass % of a binder.2. The inorganic fibrous shaped refractory article according to claim 1 , wherein the inorganic powder having a needle-like crystal structure has an average length of 1 to 3000 μm and an aspect ratio of 1 to 1000.3. The inorganic fibrous shaped refractory article according to or claim 1 , wherein the inorganic powder having a needle-like crystal structure is wollostonite powder or sepiolite powder.4. A method for producing an inorganic fibrous shaped refractory article claim 1 , wherein a slurry comprising materials comprising claim 1 , in terms of solid matters claim 1 , 2 to 95 mass % of rock wool claim 1 , 2 to 95 mass % of inorganic powder having a needle-like crystal structure and 3 to 32 mass % of a binder is subjected to dehydration shaping.5. An inorganic fibrous unshaped refractory composition comprising materials comprising claim 1 , in terms of solid matters claim 1 , 2 to 95 mass % of rock wool claim 1 , 2 to 95 mass % of inorganic powder having a needle-like crystal structure and 3 to 32 mass % of a binder. The invention relates to an inorganic fibrous shaped refractory article, a method for producing an inorganic fibrous molded refractory article, and an inorganic fibrous unshaped refractory composition.Conventionally, in an industrial furnace, a firing furnace, a heat-treatment apparatus or the like, as a lining material or a heat-insulating material for a ceiling, a wall or the like inside of a heating chamber, a relatively heavy refractory material such as ...

Refractory powder comprising coated mullite grains

A powder is disclosed having a coarse fraction representing more than 60% and less than 85% of the powder, as a weight percentage on the basis of the oxides, and that is constituted of particles having a size greater than or equal to 50 μm, referred to as “coarse particles”, the powder comprising at least 5% of coated grains having a size greater than or equal to 50 μm, as a weight percentage on the basis of the oxides of the powder, and a fine fraction, forming the balance to 100% as a weight percentage on the basis of the oxides, constituted of particles having a size of less than 50 μm, referred to as “matrix particles”. The powder can be applied in combustion chambers in which the temperature may reach 1400° C.

Oxide ceramics sintered compact and method of manufacturing the same

An oxide ceramics sintered compact comprises three kinds of phases of cordierite, mullite, and sapphirine as crystal phases is characterized in that, with a sum of contents of MgO, Al 2 O 3 , and SiO 2 being 100 mass %, it contains MgO of not less than 12 mass % and 14 mass % or less, Al 2 O 3 of not less than 34 mass % and 39 mass % or less, and SiO 2 of not less than 47 mass % and 51 mass % or less, and a content of a substance except MgO, Al 2 O 3 , and SiO 2 is less than 1.5 mass % of the whole sintered compact.

Method for fabricating a ceramic material

A method for fabricating a ceramic material includes impregnating a porous structure with a mixture that includes a preceramic polymer and a filler. The filler includes at least one free metal. The preceramic polymer material is then rigidized to form a green body. The green body is then thermally treated to convert the rigidized preceramic polymer material into a ceramic matrix located within pores of the porous structure. The same thermal treatment or a second, further thermal treatment is used to cause the at least one free metal to move to internal porosity defined by the ceramic matrix or pores of the porous structure.

REFRACTORY FILLER POWDER, SEALING MATERIAL, AND METHOD FOR PRODUCING REFRACTORY FILLER POWDER

Provided is a refractory filler powder, comprising particles, each of which has precipitates of willemite and gahnite. 1. A refractory filler powder comprisingparticles, each of which has precipitates of willemite and gahnite2. The refractory filler powder according to claim 1 , which has a ratio between the willemite and the gahnite of claim 1 , in terms of a molar ratio claim 1 , 99:1 to 70:30.3. The refractory filler powder according to claim 1 , which has a composition comprising claim 1 , in terms of mol % claim 1 , 60 to 79.9% of ZnO claim 1 , 20 to 39.9% of SiO claim 1 , and 0.1 to 10% of AlO.4. The refractory filler powder according to claim 1 , which is produced by a solid phase reaction method.5. A sealing material comprising:a glass powder; anda refractory filler powder,{'claim-ref': {'@idref': 'CLM-00001', 'claim 1'}, 'wherein the refractory filler powder comprises the refractory filler powder according to .'}6. The sealing material according to claim 5 , wherein a content of the refractory filler powder is 0.1 to 70 vol %.7. The sealing material according to claim 5 , wherein the glass powder comprises BiO—BO-based glass.8. The sealing material according to claim 5 , further comprising claim 5 , as another refractory filler powder claim 5 , one kind or two or more kinds selected from cordierite claim 5 , zircon claim 5 , β-eucryptite claim 5 , quartz glass claim 5 , alumina claim 5 , mullite claim 5 , and alumina-silica-based ceramics.9. The sealing material according to claim 5 , further comprising an inorganic pigment.10. The sealing material according to claim 5 , which is substantially free of PbO.11. A manufacturing method for a refractory filler powder claim 5 , the method comprising:{'sub': 2', '2', '3, 'blending raw materials so as to have a composition comprising, in terms of mol %, 60 to 79.9% of ZnO, 20 to 39.9% of SiO, and 0.1 to 10% of AlO; and'}making the refractory filler powder from the raw materials by a solid phase reaction method, the ...

Biodegradable material containing silicon, for pro-angiogenetic therapy

The present invention relates to a silicon-containing, biodegradable material for preventing and/or treating diseases that are associated with reduced and/or disturbed angiogenesis and/or diseases for which an increased rate of angiogenesis is beneficial to the healing process.

Method of forming ceramic coatings and ceramic coatings and structures formed thereby

A method of forming a ceramic coating, the resulting ceramic coating, and structures produced by forming the ceramic coating on a ceramic fiber shape. The method includes forming an aqueous mixture containing water, an alumino-silicate precursor, and a dispersion of a ceramic fiber material. The alumino-silicate precursor contains a colloidal suspension of silica particles, silica fume particles, and micron-sized and submicron-sized alumina particles. The ceramic fiber material includes micron-sized and submicron-sized ceramic fibers. The aqueous mixture is applied to a surface of a ceramic fiber shape, after which the aqueous mixture is cured to form a ceramic coating that contains the ceramic fiber material dispersed in an alumino-silicate matrix.

Fluorescent member and light emitting module

In a plate-shaped fluorescent member configured to convert the wavelength of the light emitted by a semiconductor light emitting element, the fluorescent member is formed of an inorganic material having a refractive index of 1.5 or more and a light transmittance at the emission peak wavelength of the semiconductor light emitting element of less than 20%. A concave portion is formed, of the surfaces of the fluorescent member, on the surface on the side where the light in the semiconductor light emitting element is mainly emitted. In the fluorescent member, the light transmittance of the light having a wavelength of 380 nm to 500 nm may be less than 20%. The concave portion may be a groove. The concave portion may be a plurality of holes that are scattered.

Method for producing composition for injection molding and composition for injection molding

A method for producing a composition for injection molding which contains an inorganic powder composed of at least one of a metal material and a ceramic material and a binder containing a polyacetal-based resin and a glycidyl group-containing polymer. The method includes: cryogenically grinding a first resin containing the polyacetal-based resin as a main component; cryogenically grinding a second resin containing the glycidyl group-containing polymer as a main component; mixing a powder obtained by grinding the first resin, a powder obtained by grinding the second resin, and the inorganic powder, thereby obtaining a mixed powder; and kneading the mixed powder.

Slurry composition, prepreg tape, and process for producing composites

Slurry and tape compositions and processes for producing CMC articles. The slurry composition contains particles of a precursor that converts to a ceramic material when heated to a firing temperature, at least one binder that is capable of adhering the particles of the ceramic precursor together to form a pliable prepreg tape, at least one liquid plasticizer, and a solvent in which the binder is dissolved. The solvent is sufficiently volatile to evaporate from the slurry composition during forming of the tape so that the tape contains less than ten weight percent of the solvent, yet the tape is also pliable as a result of the slurry composition containing a sufficient amount of the liquid plasticizer

Structured Layers Composed of Crosslinked or Crosslinkable Metal-Organic Compounds, Shaped Bodies Containing Them as well as Processes for Producing Them

The invention relates to a process for producing a structured shaped body or a layer of this type from a precursor of a metal oxide or mixed oxide selected from among magnesium, strontium, barium, aluminum, gallium, indium, silicon, tin, lead and the transition metals.

Process for compacting powders

Fluffy powders, such as calcined kaolin clays or air floated clays, can be compacted using a process which comprises applying increasing amounts of pressure to a powder moving through a confinement area. The compacted product has an improved bulk density and improved wet out and slurry incorporation times as compared to the non-compacted starting material feed.

Process for obtaining nanocrystalline corundum from natural or synthetic alums

The present invention relates to a process for obtaining nanocrystalline corundum, characterised in that it comprises a first step of thermal treatment of the raw material used in the process at standard pressure, to a temperature greater than that of the last endothermic accident of the differential thermal analysis record of the raw material, performed to 925° C.; and a second step of fast cooling from the maximum temperature reached in the preceding step to room temperature. Moreover, the present invention relates to the nanocrystalline corundum obtainable from the process described, as well as to multiple uses of said corundum. Furthermore, this material may be disaggregated, for example by means of high-energy grinding, to produce a fine aggregate that may be used as an abrasive or as a functional load in plastic polymers or other types of materials.

Refractory metal ceramics and methods of making thereof

A composition having nanoparticles of a refractory-metal carbide or refractory-metal nitride and a carbonaceous matrix. The composition is not in the form of a powder. A composition comprising a metal component and an organic component. The metal component is nanoparticles or particles of a refractory metal or a refractory-metal compound capable of decomposing into refractory metal nanoparticles. The organic component is an organic compound having a char yield of at least 60% by weight or a thermoset made from the organic compound. A method of combining particles of a refractory metal or a refractory-metal compound capable of reacting or decomposing into refractory-metal nanoparticles with an organic compound having a char yield of at least 60% by weight to form a precursor mixture.

Vacuum insulation material and method for producing same

A vacuum insulation material has excellent thermal insulation even in a high-temperature environment over a long period of time. A core starting material composition is molded into a predetermined shape, the core starting material composition containing a talc-based clay mineral, a potassium compound selected from potassium carbonate and potassium bicarbonate, and water, and the resultant core starting material composition is fired at a temperature lower than a melting point of the talc-based clay mineral, to produce a core material formed of a porous fired body in which a layered structure of the talc-based clay mineral is cleaved and at least a portion of the cleaved structure is partially bonded. This core material is then vacuum packaged in a gas-barrier packaging, to produce the vacuum insulation material.

Silicon carbide ceramic and honeycomb structure

Provided is a silicon carbide ceramic having a small amount of resistivity change due to temperature change and being capable of generating heat by current application; and containing silicon carbide crystals having 0.1 to 25 mass % of 4H—SiC silicon carbide crystals and 50 to 99.9 mass % of 6H—SiC silicon carbide crystals, preferably having a nitrogen content of 0.01 mass % or less, more preferably containing two or more kinds of silicon carbide particles containing silicon carbide crystals and silicon for binding these silicon carbide particles to each other and having a silicon content of from 10 to 40 mass %.

Method for producing slurry composition

The present invention provides a method for producing a slurry composition which realizes excellent dispersibility through simple steps and can maintain high dispersibility over a long term. In addition, the present invention provides a slurry composition produced using this method. The present invention provides s method for producing a slurry composition containing an inorganic powder, a polyvinyl acetal resin, and an organic solvent, the method comprising the steps of: mixing an inorganic powder, a mixed polyvinyl acetal resin (A) and an organic solvent for inorganic dispersion to prepare an inorganic dispersion; mixing a polyvinyl acetal resin (B) and an organic solvent for resin solution to prepare a resin solution; and adding the resin solution to the inorganic dispersion, the mixed polyvinyl acetal resin (A) including a polyvinyl acetal resin (a1) having a hydroxy group content of 20 to 40 mol % and a polyvinyl acetal resin (a1) having a hydroxy group content of 28 to 60 mol %, the polyvinyl acetal resin (a1) and the polyvinyl acetal resin (a2) being in a relation represented by the following formula (1): Y−X ≧5   (1) wherein X represents the hydroxy group content (mol %) in the polyvinyl acetal resin (a1), and Y represents the hydroxy group content (mol %) in the polyvinyl acetal resin (a2), the polyvinyl acetal resin (B) having a polymerization degree of 800 to 4200, and an amount of the mixed polyvinyl acetal resin (A) used in the step of preparation of the inorganic dispersion being 0.1 to 20 parts by weight relative to 100 parts by weight of the inorganic powder.

Methods of Synthesizing Thermoelectric Materials

Methods for synthesis of thermoelectric materials are disclosed. In some embodiments, a method of fabricating a thermoelectric material includes generating a plurality of nanoparticles from a starting material comprising one or more chalcogens and one or more transition metals; and consolidating the nanoparticles under elevated pressure and temperature, wherein the nanoparticles are heated and cooled at a controlled rate.

Sintered body and cutting tool

A sintered body containing alumina crystal particles and zirconia crystal particles as main components includes the tetragonal crystal particles as the zirconia crystal particles. The zirconia crystal particles satisfy relations 0%≦A≦3%, 3%≦B≦22% and 77%≦C≦96%, where A, B and C are as defined herein.

Method For The Production Of Stable Binder-Free High-Purity Moldings Composed Of Metal Oxides and Their Use

Stable high strength porous metal oxide articles suitable, for example, for use as catalyst supports, are prepared by predisposing fine metal oxide particles in water followed by fine dispersion under high shear, and subjecting the dispersion to a change in pH to coagulate the metal oxide particles and form a moldable viscoelastic composition. The moldings are substantially free of impurity atoms.

Solid lithium ion conducting electrolytes and methods of preparation

A composition comprised of nanoparticles of lithium ion conducting solid oxide material, wherein the solid oxide material is comprised of lithium ions, and at least one type of metal ion selected from pentavalent metal ions and trivalent lanthanide metal ions. Solution methods useful for synthesizing these solid oxide materials, as well as precursor solutions and components thereof, are also described. The solid oxide materials are incorporated as electrolytes into lithium ion batteries.

Non-reducible low temperature sinterable dielectric ceramic composition for multi layer ceramic capacitor and manufacturing method thereof

The present invention relates to a dielectric ceramic composition for multilayer ceramic capacitor (MLCC), including a first component of 91 to 98 wt % and a second component of 2 to 9 wt %, wherein the first component includes a main component BaTiO 3 of 94 to 98 wt %, a first subcomponent of 0.5 to 2 wt % including a glass powder having a mesh structure, and a second subcomponent of 1 to 4 wt % including at least one of MgO, Cr 2 O 3 and Mn 3 O 4 , and the second component includes (Ba 1-y-x Ca y Sr x )(Zr y Ti 1-y )O 3 , and x satisfies 0.2≦x≦0.8 and y satisfies 0.03≦y≦0.15.

Process for preparing ceramic powders in the presence of a source of carbon, powders thus obtained and their use

A method for preparing ceramic powders in the presence of a carbon powder including a step which consists in homogenizing a mixture of particles capable of resulting in a ceramic by heat treatment. Said method can be carried out in the presence of an accelerated solvent and provides, at reduced energy consumption, carbon-coated ceramic powders and then ceramics.

Ceramic powder and multi-layer ceramic capacitor

A ceramic powder that contains, as a main composition, barium titanate powder having a perovskite structure with an average particle size (median size) of 200 nm or smaller as measured by SEM observation, wherein the barium titanate powder is such that the percentage of barium titanate particles having twin defects in the barium titanate powder is 13% or more as measured by TEM observation and that its crystal lattice c/a is 1.0080 or more. The ceramic powder has a wide range of optimum sintering temperatures and thus offers excellent productivity and is particularly useful in the formation of thin dielectric layers of 1 μm or less.

Organic-inorganic hybrid nanofibres having a mesoporous inorganic phase, preparation thereof by electrospinning, membrane, electrode, and fuel cell

Organic-inorganic hybrid nanofibres comprising two phases: a first mineral phase comprising a structured mesoporous network with open porosity; and a second organic phase comprising an organic polymer, wherein said organic phase is basically not present inside the pores of the structured mesoporous network. A membrane and an electrode comprising said nanofibres. A fuel cell comprising said membrane and/or said electrode. A method of preparing said nanofibres by electrically assisted extrusion (electrospinning).

High durability joints between ceramic articles, and methods of making and using same

Embodiments of the present invention provide high durability joints between ceramic articles, particularly between beta-silicon carbide (β-SiC) articles, and methods of making and using the same. In one embodiment, a joint between first and second articles each comprising a ceramic polymorph comprises a matrix comprising the ceramic polymorph and extending between the first and second articles; a plurality of inclusions comprising the ceramic polymorph and being distributed throughout the matrix; and a sealing layer comprising the ceramic polymorph and being respectively disposed on the first and second articles and the matrix.

Process for preparing cellular inorganic monolithic materials and uses of these materials

A process is provided for preparing an inorganic material in the form of an alveolar monolith of a silica matrix where the monolith includes interconnected macropores. The process includes at least one step of mineralizing an oil-in-water emulsion formed from droplets of an oily phase dispersed in a continuous aqueous phase and in which colloidal solid particles are present at the interface formed between the continuous aqueous phase and the dispersed droplets of oily phase. Such materials obtained according to this process may be used, especially for separative chemistry and filtration, for performing chemical reactions catalysed in heterogeneous phase, as thermal or phonic insulators, or as templates for manufacturing controlled-porosity carbon skeletons.

Graphite foil-bonded device and method for preparing same

A device has a layered structure, and the layered structure has a graphite foil bonded to a surface of a substrate, wherein the graphite foil contains a laminate of a plurality of natural graphite flakes parallel to the surface of the substrate, wherein the graphite foil and the surface of the substrate are bonded through diffusion bonding directly, or bonded with a cured resin, a cured pitch, a carbonized resin, a carbonized pitch, a graphitized resin or a graphitized pitch in between, wherein the graphite foil contains not less than 95%, preferably 99%, of carbon.

Method and apparatus for sintering flat ceramics

A method and apparatus for sintering flat ceramics using a mesh or lattice is described herein.

Alumina sintered body, abrasive grains, and grindstone

Provided are an alumina sintered compact containing a titanium compound and an iron compound, wherein FeTiAlO 5 grains exist in the grain boundary of the alumina grains and the mean grain size of the FeTiAlO 5 grains is from 3.4 to 7.0 μm; and an abrasive grain and a grain stone using the alumina sintered compact.

Solid oxide fuel cell

Provided is a solid oxide fuel cell having a service life of approximately 90,000 hours, a level required to encourage the widespread use of SOFC. The solid oxide fuel cell according to the present invention comprises a solid electrolyte layer, an oxygen electrode layer provide to one side of the solid electrolyte layer, and a fuel electrode layer provide to the other side of the solid electrolyte layer. The oxygen electrode layer is made from a material including iron or manganese, the solid electrolyte layer is made from a scandia-stabilized zirconia electrolyte material containing alumina, and the solid electrolyte layer has a lanthanoid oxide and/or yttria dissolved therein.

Alumina sintered body, abrasive grains, and grindstone

Provided are an alumina sintered compact containing a titanium compound and an iron compound, wherein the total amount of the TiO 2 -equivalent content of the titanium compound, the Fe 2 O 3 -equivalent content of the iron compound and the alumina content is at least 98% by mass, the total amount of the TiO 2 -equivalent content of the titanium compound and the Fe 2 O 3 -equivalent content of the iron compound is from 5 to 13% by mass, and the ratio by mass of the TiO 2 -equivalent content of the titanium compound to the Fe 2 O 3 -equivalent content of the iron compound (TiO 2 /Fe 2 O 3 ) is from 0.85/1.15 to 1.15/0.85; and an abrasive grain and a grain stone using the alumina sintered compact.

Piezoelectric porcelain composition

Provided is a Sr 2-x Ca x NaNb 5 O 15 type piezoelectric ceramic composition wherein the inhibition of cracking and an improvement in the piezoelectric characteristics are attained by improving the composition uniformity and the microstructure uniformity. In the basic Sr 2-x Ca x NaNb 5 O 15 composition, the (Sr, Ca)/Na ratio is changed, whereby the occupancies of Sr, Ca and Na in lattices which constitute the tungsten-bronze type structure and into which Sr, Ca, and Na can enter are reduced to facilitate the entrance of Sr into the lattices and thus inhibit the formation of a secondary phase. Further, a predetermined amount of Al and/or Si is added to lower the sintering temperature and to make the microstructure uniform. Additionally, a predetermined amount of Mn is added to make the polarization easy.

Method and Apparatus for Preparing a Ceramic Dental Restoration in One Appointment

Methods and apparatus that permit a dentist to provide a patient with a monolithic ceramic dental restoration (e.g., crown, bridge, or the like) in one office visit. In some embodiments, a dentist is provided with a kit containing one or more near net shape (NNS) millable blanks of various shapes and shades, chair-side software, and a chair-side milling machine to convert a selected millable blank into a finished, fully contoured restoration in about one hour or less. Each such millable blank may be, for example, a dental ceramic (e.g., fully sintered zirconia, fully crystallized lithium silicate, fully crystallized lithium disilicate, or the like) NNS component. In some embodiments, the NNS component includes an integral mandrel at a precise location and orientation to minimize the amount of milling time.

Piezoelectric material, piezoelectric element, liquid discharge head, ultrasonic motor, and dust removing device

Provided is a piezoelectric material which has satisfactory insulation property and piezoelectric property and which does not contain lead and potassium. The piezoelectric material includes a perovskite-type metal oxide that is represented by the following general formula (1): (Na x Ba 1-y )(Nb y Ti 1-y )O 3   General formula (1) where relationships of 0.80≦x≦0.95 and 0.85≦y≦0.95 are satisfied, and y×0.05 mol % or more to y×2 mol % or less of copper with respect to 1 mol of the perovskite-type metal oxide.

Highly efficient method for producing ceramic microparticles

Provided is a more suitable method for producing ceramic microparticles. The present invention uses at least two types of fluids to be processed; at least one of the fluids to be processed is a fluid containing a ceramic starting material liquid that mixes and/or dissolves a ceramic starting material in a basic solvent; of the fluids aside from the ceramic starting material liquid, at least one of the fluids to be processed is a fluid containing a solvent for precipitating ceramic microparticles; and ceramic microparticles are precipitated by mixing the fluid containing the ceramic starting material liquid and the fluid containing the solvent for precipitating ceramic microparticles within a thin film fluid formed between at least two surfaces ( 1,2 ) for processing that are provided facing each other, are able to approach and separate each other, and of which one is able to rotate with respect to the other. Ceramic microparticles having as increased crystallinity are obtained by mixing the fluid containing the precipitated ceramic microparticles precipitate and a fluid containing an acidic substance.

Sintering Aid Coated YAG Powders and Agglomerates and Methods for Making

Method of Making particles including a YAG core and a coating of sintering aid deposited thereon. The particles and agglomerates thereof maybe formed as a powder. The coated YAG-containing particles are well-suited to production of polycrystalline YAG-containing ceramics. The coated YAG-containing particles may be fabricated using a novel fabrication method which avoids the need for formation of a homogeneous powder mixture of YAG and sintering aid. The mixture may be sprayed into a drying column and dried to produce coated particles. Alternatively, the YAG particles and sintering aid or sintering aid precursor solution may be separately introduced to the drying column and dried to form coated YAG-containing particles.

Method for manufacturing refractory grains containing chromium(iii) oxide

A method for manufacturing sintered refractory grains containing Cr 2 CO 3 from an initial refractory product including one or more chromium that includes: A) optionally, \crushing the starting refractory material; B) grinding a filler, comprising said starting refractory material in a liquid medium to obtain a suspension of particles of said starting refractory material; C) preparing a starting mixture including at least 1 wt % of particles of the suspension obtained during the preceding step; D) shaping the starting mixture into the shape of a preform; E) optionally drying the preform obtained in step D); F) sintering the preform so as to obtain a sintered body; G) optionally grinding the sintered body; and H) the optional selection by particle size.

PROCESS FOR PRODUCING SIO2 MOULDINGS

The present invention relates to a process for producing SiOmouldings, comprising the preparation of a free-flowing aqueous SiOcomposition, solidification of the aqueous SiOcomposition and drying of the solidified SiOcomposition, wherein the aqueous SiOcomposition is a self-assembly composition. 1. A process for producing SiOmouldings , the process comprising: preparing a free-flowing aqueous SiOcomposition; solidifying the free-flowing aqueous SiOcomposition to form a solidified aqueous SiOcomposition , and drying the solidified aqueous SiOcomposition to form a dried SiOmoulding , wherein the aqueous SiOcomposition is a self-assembly composition.2. The process according to claim 1 , wherein the aqueous SiOcomposition is poured into a mould.3. The process according to claim 2 , wherein the mould has a sieve structure.4. The process according to claim 1 , wherein a gaseous medium is contacted with or flows through the free-flowing aqueous SiOcomposition.5. The process according to claim 4 , wherein the gaseous medium is steam or high-pressure steam.6. The process according to claim 1 , wherein the solidified aqueous SiOcomposition has a water content in the range from 2 to 98% by weight.7. The process according to claim 1 , wherein the free-flowing aqueous SiOcomposition has a pH less than 3.5.8. The process according to claim 1 , wherein the solidified aqueous SiOcomposition is rendered free-flowing for shaping by the action of shear forces.9. The process according to claim 1 , wherein solidifying comprises leaving the aqueous SiOcomposition to stand for at least 0.1 minute.10. The process according to claim 1 , wherein an additive is added to the aqueous SiOcomposition to effect or accelerate solidification.11. The process according to claim 11 , wherein the additive is a silane.12. The process according to claim 1 , wherein the free-flowing aqueous SiOcomposition comprises an alkaline compound.13. The process according to claim 1 , wherein the free-flowing aqueous ...

Zirconia-based material doped with yttrium and lanthanum

Sintered bodies containing zirconia-based ceramic materials and partially sintered bodies that are intermediates in the preparation of the sintered bodies are described. The zirconia-based ceramic material is doped with lanthanum and yttrium. The grain size of the zirconia-based ceramic material can be controlled by the addition of lanthanum. The crystalline phase of the zirconia-based ceramic material can be influenced by the addition of yttrium.

Calcium titanate containing mold compositions and methods for casting titanium and titanium aluminide alloys

The disclosure relates generally to mold compositions comprising calcium aluminate and calcium titanate. The disclosure also relates to methods of molding and the articles so molded using the mold compositions. More specifically, the disclosure relates to calcium aluminate/calcium titanate mold compositions and methods for casting titanium-containing articles, and the titanium-containing articles so molded.

Compositions and methods for converting hazardous waste glass into non-hazardous products

The present invention provides compositions and methods for converting hazardous waste glass into safe and usable material. In particular, the present invention provides compositions and methods for producing ceramic products from toxic-metal-containing waste glass, thereby safely encapsulating the metals and other hazardous components within the ceramic products.

Method of forming ceramic articles from recycled aluminosilicates

The present invention relates to a process of forming ceramic articles that contain a high percentage of recycled alumina silicate in their composition. The fabrication process includes a fusing of the base material forming a reticulated network that is in-filled with a melted additive composition. The base material gives the article dimensional stability and strength while the additive composition gives the article water resistance and toughness In this invention, an additive powder with an engineered melting temperature is added to the recycled base material. The mixture is heated until the recycled aluminosilicate reaches the optimal fusing temperature. Heating is continued until the additive begins to melt filling the voids between the fused aluminosilicates particles. The article is then rapidly cooled to quench the fusing without cracking. The resulting article has high strength due to the fused alumina silicate particles and low water absorbance and high density due to the melted additive component filling all the pores between the fused alumina silicate particles.

Additive manufacturing material for powder rapid prototyping manufacturing

A molding material is provided which, despite containing a ceramic, enables efficient molding for producing high-density molded articles. The present invention provides a molding material to be used in powder laminate molding. This molding material contains a first powder which contains a ceramic, and a second powder which contains a metal. Further, the first powder and the second powder configure granulated particles. Ideally, the ratio of the content of the second powder to the total content of the first powder and the second powder is greater than 10 mass % and less than 90 mass %.

CERAMIC MATERIAL AND METHOD OF PREPARING THE SAME

A ceramic material, including: BaWO-xMCO-yBaO-zBO-wSiO, where x=0-0.2 mole, y=0-0.05 mole, z=0-0.2 mole, w=0-0.1 mole, M represents an alkali metal ion selected from Li, K, Na, and x, y, z, and w are not zero at the same time. 1. A ceramic material , comprising: BaWO-xMCO-yBaO-zBO-wSiO , wherein x=0-0.2 mole , y=0-0.05 mole , z=0-0.2 mole , w=0-0.1 mole , M represents an alkali metal ion selected from Li , K , Na , and x , y , z , and w are not zero at the same time.2. A method , comprising:{'sub': 3', '3', '2', '3', '2', '3', '2', '4', '2', '3', '2', '3', '2, 'sup': +', '+', '+, '1) weighing and mixing BaCO, WO, MCO, BOand SiObased on a chemical formula BaWO-xMCO-yBaO-zBO-wSiO, wherein x=0-0.2 mole, y=0-0.05 mole, z=0-0.2 mole, w=0-0.1 mole, M represents an alkali metal ion selected from Li, K, Na, and x, y, z, and w are not zero at the same time, to yield a first powder;'}2) mixing the first powder obtained in 1), zirconia balls, and deionized water according to a mass ratio of 1:5:1-2, ball-milling for 4-7 h, drying at 80-120° C., sieving with a 40-60 mesh sieve, calcining in air atmosphere at 700-900° C. for 2-4 h, to yield a second powder;3) mixing the second powder obtained in 2), zirconia balls, and deionized water according to a mass ratio of 1:5:1-2, ball-milling for 3-6 h, drying, to yield a third powder, and adding a binder to the third powder; and4) compression molding a resulting product obtained in 3) under a pressure of 20 megapascal, drying at 400-500° C. and sintering at 850° C.-900° C. for 0.5-2 h.3. The method of claim 2 , wherein the binder is an acrylic solution. Pursuant to 35 U.S.C. § 119 and the Paris Convention Treaty, this application claims foreign priority to Chinese Patent Application No. 201910603226.3 filed Jul. 5, 2019, the contents of which, including any intervening amendments thereto, are incorporated herein by reference. Inquiries from the public to applicants or assignees concerning this document or the related applications ...

FLUORIDE SINTERED BODY FOR NEUTRON MODERATOR AND METHOD FOR PRODUCING THE SAME

A fluoride sintered body suitable for a moderator which moderates high-energy neutrons so as to generate neutrons for medical care with which an affected part of the deep part of the body is irradiated to make a tumor extinct comprises MgFof a compact polycrystalline structure having a bulk density of 2.90 g/cmor more and as regards mechanical strengths, a bending strength of 10 MPa or more and a Vickers hardness of 71 or more. 1. A fluoride sintered body for a neutron moderator , comprising MgFof a compact polycrystalline structure having a bulk density of 2.90 g/cmor more.2. The fluoride sintered body for a neutron moderator according to claim 1 , having a bending strength of 10 MPa or more and a Vickers hardness of 71 or more as regards mechanical strengths.3. A method for producing a fluoride sintered body for a neutron moderator claim 1 , the fluoride sintered body comprising a MgFsintered body according to claim 1 , comprising the steps of:{'sub': '2', 'pulverizing a high-purity MgFraw material and mixing the same with 0.1-1% by weight of a sintering aid added;'}molding the same at a molding pressure of 5 MPa or more using a uniaxial press device;molding the same at a molding pressure of 5 MPa or more using a cold isostatic pressing (CIP) device;conducting preliminary sintering in the temperature range of 550° C.-600° C. for 4-10 hours in an air atmosphere:heating in the temperature range of 750° C.-840° C. for 5-12 hours in an inert gas atmosphere; and{'sub': '2', 'conducting main sintering by heating in the temperature range of 900° C.-1100° C. for 0.5-3 hours in the same atmosphere as the preceding step so as to form a MgFsintered body having a compact structure.'}4. The method for producing a fluoride sintered body for a neutron moderator according to claim 3 ,wherein the inert gas atmosphere in the main sintering step comprises one kind of gas or a mixture of plural kinds of gases, selected from among nitrogen, helium, argon and neon. The present ...

Composite Ceramics and Ceramic Particles and Method for Producing Ceramic Particles and Bulk Ceramic Particles

Methods for producing Polymer Derived Ceramic (PDCs) particles and bulk ceramic components and compositions from partially cured gelatinous polymer ceramic precursors and unique bulk composite PDC ceramics and unique PDC ceramic particles in size and composition. Methods of making fully dense PDCs over approximately 2 μm to approximately 300 mm in diameter for applications such as but not limited to proppants, hybrid ball bearings, catalysts, and the like. Methods can include emulsion processes or spray processes to produce PDCs. The ceramic particles and compositions can be shaped and chemically and materially augmented with enhancement particles in the liquid resin or gelatinous polymeric state before being pyrolyzed into ceramic components. The resulting ceramic components have a very smooth surface and are fully dense, not porous as ceramic components from the sol-gel process.

AQUEOUS SLURRY FOR MAKING A POWDER OF HARD MATERIAL

An aqueous slurry that is useful upon being spray dried for the formation of a powder of hard material. The aqueous slurry includes starting powder components of the hard material. The slurry further includes an oxidation inhibitor, a surfactant in an amount between about 0.05 weight percent and about 0.30 weight percent of the weight of the starting powder components of the hard material, a binder, a defoamer and water in an between about 15 weight percent and about 30 weight percent of the weight of the weight of the starting powder components of the hard material. The aqueous slurry has a percent solids value that is between about 70 percent and about 85 percent. 1. A powder of hard material produced by the process comprising the steps of:spray drying an aqueous slurry comprising:starting powder components of the hard material;an oxidation inhibitor in an amount of about 0.2 weight percent to about 0.5 weight percent based on weight of the starting powder components of the hard material;a surfactant in an amount of about 0.05 weight percent to about 0.30 weight percent of the weight of the starting powder components of the hard material;a binder in an amount of about 1.2 weight percent to about 4.0 weight percent of the weight of the starting powder components of the hard material;a defoamer in an amount of about 0.05 weight percent to about 0.35 weight percent of the weight of the starting powder components of the hard material; andwater in an amount of about 15 weight percent and about 30 weight percent of the weight of the starting powder components of the hard material; andthe aqueous slurry having a percent solids of about 70 percent to about 85 percent wherein the percent solids comprises a quotient in percent of the weight of the starting powder components of the hard material divided by the sum of the weight of the starting powder components of the hard material and the weight of the water.2. The powder of hard material of claim 1 , wherein granule size ...

POROUS PLATE-SHAPED FILLER

Provided is a porous plate-shaped filler that can be used as a material for a heat-insulation film having excellent heat insulation performance. In a porous plate-shaped filler having a plate shape, an aspect ratio is 3 or higher, a minimum length is 0.5 to 50 μm, and an overall porosity is 20 to 90%, and the porosity is lower in the circumferential part than in the center part. When this porous plate-shaped filler of the present invention is contained in a heat-insulation film, the infiltration of a matrix into the filler is reduced, and thus the thermal conductivity can be lowered. Therefore, even a thin heat-insulation film can have a greater heat-insulation effect than before. 1. A porous plate-shaped filler having a plate shape with an aspect ratio of 3 or higher , a minimum length of 0.5 to 50 μm , and an overall porosity of 20 to 90% , wherein the porosity is lower in the circumferential part than in the center part.2. The porous plate-shaped filler according to claim 1 , wherein the center part and the circumferential part have the same type of material for a base material.3. The porous plate-shaped filler according to claim 1 , wherein the center part and the circumferential part have a different type of material for a base material.4. The porous plate-shaped filler according to claim 1 , wherein the type of material of the circumferential part contains at least one of a fluororesin claim 1 , a silicone resin claim 1 , a polyimide resin claim 1 , a polyamide resin claim 1 , an acrylic resin claim 1 , and an epoxy resin.5. The porous plate-shaped filler according to claim 1 , wherein the circumferential part has a porosity which is lower by 10% or more than the center part.6. The porous plate-shaped filler according to claim 1 , wherein the average pore diameter is smaller in the circumferential part than in the center part.7. The porous plate-shaped filler according to claim 1 , wherein the average pore diameter of the circumferential part is 0.1 μm or less ...

Method of preparing silicon carbide and filters made therefrom

A method of making SiC nanowires comprising: (a) mixing silicon powder with a carbon-containing biopolymer and a catalyst at room temperature to form a mixture; and (b) heating said mixture to a pyrolyzing temperature sufficient to react said biopolymer and said silicon power to form SiC nanowires.

CERAMIC MATRIX COMPOSITE ARTICLES HAVING DIFFERENT LOCALIZED PROPERTIES AND METHODS FOR FORMING SAME

Ceramic matrix composite articles include, for example a first plurality of plies of ceramic fibers in a ceramic matrix defining a first extent, and a local at least one second ply in said ceramic matrix defining a second extent on and/or in said first plurality of plies with the second extent being less than said first extent. The first plurality of plies has a first property, the at least one second ply has at least one second property, and said first property being different from said at least one second property. The different properties may include one or more different mechanical (stress/strain) properties, one or more different thermal conductivity properties, one or more different electrical conductivity properties, one or more different other properties, and combinations thereof. 1. A method for use in forming a ceramic matrix composite article , the method comprising:laying up a first plurality of plies comprising ceramic fibers defining a first extent;laying up at least one second ply defining a second extent on and/or in the layup of the first plurality of plies, the second extent being less than the first extent; andwherein the first plurality of plies comprises a first property, the at least one second ply comprises at least one second property, and the first property being different from the at least one second property.2. The method of wherein the laying up the at least one second ply comprises laying up the at least one second ply comprising ceramic fibers.3. The method of wherein the laying up the at least one second ply comprises laying up a plurality second plies claim 1 , and wherein the plurality of second plies comprises a plurality of second properties different from the first property.4. The method of wherein the first property comprises a first fiber volume fraction claim 1 , the at least one second property comprises at least one second fiber volume fraction claim 1 , and the first fiber volume fraction being different from the at least ...

Water Soluble Sackets of Water Insoluble SiOC Ceramic Pigments

Cement, concrete, stucco, and plaster that are have black ceramic polymer derived pigment included as an encapsulated water soluble sacket added to the powered or wet materials. A ceramic black SiOC additive encapsulated in a water soluble sacket and having a particle size of about 0.1 μm to 3 μm. 1. A black cement mixture comprising a dry powdered cement and a black water insoluble SiOC ceramic pigment , wherein the pigment is encapsulated in a water soluble sacket.2. The cement of claim 1 , comprising about 6% to about 15% ceramic pigment.3. The cement of claim 2 , comprising at least about 8% ceramic pigment.4. The cement of claim 2 , comprising at least about 10% ceramic pigment.5. A black concrete comprising a dry powdered cement claim 2 , aggregate and a black water insoluble SiOC pigment claim 2 , wherein the pigment is encapsulated in a water soluble sacket.6. The concrete of claim 5 , comprising about 6% to about 15% ceramic pigment to cement.7. The concrete of claim 6 , comprising at least about 8% ceramic pigment to cement.8. The concrete of claim 6 , comprising at least about 10% ceramic pigment to cement.9. A method for making a black cement claim 6 , concrete claim 6 , stucco or plaster structure claim 6 , adding a water soluble sacket comprising a pyrolized polymer derived ceramic black pigment polymer claim 6 , wherein the pigment is water insoluble claim 6 , to a cement claim 6 , concrete claim 6 , stucco or plaster material claim 6 , mixing the combined pigment and material to provide a uniform distribution of the pigment within the material claim 6 , forming the material into a shape claim 6 , hardening the material into a black cement claim 6 , concrete claim 6 , stucco or plaster structure claim 6 , whereby the hardened structure has a uniform black color throughout the entirety of a structure.10. The method of claim 9 , wherein the pigment comprises at least about 2% of the structure.11. The method of claim 9 , wherein the pigment comprises at ...

GRAPHENE MACRO-ASSEMBLY-FULLERENE COMPOSITE FOR ELECTRICAL ENERGY STORAGE

Disclosed here is a method for producing a graphene macro-assembly (GMA)-fullerene composite, comprising providing a mixture of graphene oxide and water, adding a hydroxylated fullerene to the mixture, and forming a gel of the hydroxylated fullerene and the mixture. Also described are a GMA-fullerene composite produced, an electrode comprising the GMA-fullerene composite, and a supercapacitor comprising the electrode. 1. A method for producing a graphene macro-assembly (GMA)-fullerene composite , comprising:providing graphene oxide;adding a hydroxylated fullerene compound to the graphene oxide; andperforming a gelation process using the graphene oxide and the hydroxylated fullerene.2. The method of claim 1 , wherein providing the graphene oxide comprises providing a water suspension of graphene oxide.3. The method of claim 2 , wherein the water suspension of graphene oxide comprises a mixture of at least about 7 mg of graphene oxide in 1 mL of water.4. The method of claim 1 , wherein the hydroxylated fullerene compound comprises a Chydroxylated fullerene claim 1 , a Chydroxylated fullerene claim 1 , or a Chydroxylated fullerene.5. The method of claim 1 , wherein adding the hydroxylated fullerene compound comprises adding about 5 mg of water soluble C(OH)to the graphene oxide claim 1 , the graphene oxide comprising a mixture of about 20 mg of graphene oxide in 1 mL of water.6. The method of claim 1 , further comprising sonicating the hydroxylated fullerene and the graphene oxide.7. The method of claim 1 , further comprising adding claim 1 , to about 1 g of a suspension formed from the hydroxylated fullerene compound and the graphene oxide claim 1 , about 211 μL of ammonium hydroxide solution to form a mixture claim 1 , wherein performing the gelation process comprises performing the gelation process using the mixture.8. The method of claim 1 , wherein performing the gelation process comprises performing the gelation process at about 80° C. for about 72 hours.9. The ...

METHOD FOR PRODUCING A SILICON CARBIDE SHAPED BODY

The invention relates to a method for producing a shaped body that contains at least 85 vol. % crystalline silicon carbide and at most 15 vol. % silicon, comprising the following steps: a) providing a powdered mixture that contains at least 60 vol. % amorphous silicon carbide and at most 40 vol. % silicon having a crystallite size of 3-50 nm; b) shaping the mixture by b1) hot pressing, or b2) compacting at room temperature and subsequent sintering or hot pressing, wherein the sintering or hot pressing is carried out in an inert gas or vacuum at a temperature of at least 1400° C. The volume ratio SiC:Si in the powdered mixture is 95:5-99:1. 1. A process for producing a shaped body , the method comprising the steps of:a) providing a pulverulent mixture comprising at least 60% by volume of amorphous silicon carbide and not more than 40% by volume of silicon having a crystallite size of from 3 to 50 nm, andb) shaping the pulverulent mixture by either b1) hot pressing or b2) compacting at room temperature and subsequent sintering or hot pressing,wherein the shaped body comprise at least 85% by volume of crystalline silicon carbide and not more than 15% by volume of silicon, andthe sintering or hot pressing is carried out under inert gas or reduced pressure at a temperature of at least 1400° C.2. The process of claim 1 ,wherein the pulverulent mixture comprises at least 90% by volume of amorphous silicon carbide and not more than 10% by volume of silicon.3. The process of claim 1 ,wherein the temperature is from 1900 to 2100° C.4. The process of claim 1 , wherein a volume ratio of SiC:Si in the pulverulent mixture is from 95:5 to 99:1 and the temperature is from 2000 to 2100° C.5. The process claim 1 ,wherein the pulverulent mixture consists to an extent of at least total 98% by weight of amorphous silicon carbide and silicon.6. The process of claim 1 ,wherein no sintering aids are used.7. The process of claim 1 , wherein a BET surface area of the pulverulent mixture is ...

IMPROVED PROCESS FOR PRODUCING SILICA AEROGEL THERMAL INSULATION PRODUCT WITH INCREASED EFFICIENCY

The invention relates to an improved method for producing silica aerogel in pure and flexible sheet form having effective suppression of radiative heat transport at high temperatures and increased thermal insulation property. The suppression of radiative heat transport was achieved by in-situ production of titanium dioxide nanoparticles in very minor concentrations during gelation of silica precursor, with nanoporous surface area more than 300 m2/g and acts as an infra red reflecting agent. When aerogel is subjected to heat during hot object insulation, it automatically turn into infra red reflecting material. Said silica aerogel can be incorporated into the inorganic fibre mat matrix individually or into two or more layers with organic sponge sheet placed in between and stitched together to form a sandwich sheet to form highly insulating flexible sheet. 118.-. (canceled)19. A method for preparation of a silica aerogel thermal insulation product , the method comprising:(a) preparing a hydro-alcoholic solution containing at least one alkali;(b) adding a solution of a metal oxide precursor to the hydro-alcoholic solution to form a dispersion effecting in-situ formation and precipitation of nanoparticles of at least one metal oxide, wherein the metal oxide precursor comprises one or more metals selected from the group consisting of iron, manganese, magnesium, zirconium, zinc, chromium, cobalt, titanium, tin, and indium;(c) mixing at least one silica precursor with the dispersion to form a first mixture;(d) stirring the first mixture to obtain a viscous mixture with the nanoparticles entrapped therewithin;(e) aging the viscous mixture to form an aged viscous mixture; and(f) effecting supercritical drying of the aged viscous mixture, to obtain the silica aerogel thermal insulation product.20. The method of claim 19 , wherein the at least one silica precursor is selected from the group consisting of tetraethylorthosilicate claim 19 , tetramethylorthosilicate claim 19 , ...

METHOD FOR PRODUCING BETA-SIALON FLUORESCENT MATERIAL

Provided is a method for producing a β-sialon fluorescent material, comprising preparing a composition containing a silicon nitride that contains aluminium, oxygen, and europium; heat-treating the composition at a temperature in a range of 1300° C. or more and 1600° C. or less to obtain a heat-treated product; subjecting the heat-treated product to a temperature-decrease of from the heat treatment temperature to 1000° C. as a first temperature-decrease step; and subjecting the heat-treated product to a temperature-decrease of from 1000° C. to 400° C. as a second temperature-decrease step. The first temperature-decrease step has a temperature-decrease rate in a range of 1.5° C./min or more and 200° C./min or less, and the second temperature-decrease step has a temperature-decrease rate in a range of 1° C./min or more and 200° C./min or less 1. A method for producing a β-sialon fluorescent material , comprising:preparing a composition containing a silicon nitride that contains aluminium, oxygen, and europium;heat-treating the composition at a temperature in a range of 1300° C. or more and 1600° C. or less to obtain a heat-treated product;subjecting the heat-treated product to a temperature decrease from the temperature of the heat-treating to 1000° C. as a first temperature-decrease step; andsubjecting the heat-treated product to a temperature decrease from 1000° C. to 400° C. as a second temperature-decrease step,wherein the first temperature-decrease step has a temperature-decrease rate in a range of 1.5° C./min or more and 200° C./min or less, and the second temperature-decrease step has a temperature-decrease rate in a range of 1° C./min or more and 200° C./min or less.2. The method for producing a β-sialon fluorescent material according to claim 1 , wherein the first temperature-decrease step has a temperature-decrease rate in a range of 2° C./min or more and 200° C./min or less.3. The method for producing a β-sialon fluorescent material according to claim 1 , ...

SIC-BOUND HARD MATERIAL PARTICLES, POROUS COMPONENT FORMED WITH SIC-BOUND DIAMOND PARTICLES, METHOD OF PRODUCING SAME AND USE THEREOF

The invention relates to SiC-bound diamond hard material particles, a porous component formed with SiC-bound diamond particles, methods for producing same and the use thereof. Diamond hard material particles and components have a composition of 30 vol. % to 65 vol. % diamond, 70 vol % to 35 vol. % SiC and 0 to 30 vol. % Si, and a component has a porosity in the range of 10% to 40% 1. SiC-bound hard diamond material particles having a composition of 30%-65% by volume of diamond , 70%-35% by volume of SiC and 0% to 30% by volume of Si , and diamond particles in individual hard material particles are cohesively bonded to one another by the SiC and Si formed in a thermal treatment and have a particle size in the range of 50 μm-5000 μm.2. The SiC-bound hard diamond material particles as claimed in claim 1 , wherein a median particle size dof diamond particles in the hard material particles in the range of 5 μm to 500 μm is maintained.3. The SiC-bound hard diamond material particles as claimed in claim 1 , wherein not more than 90% of the surface area of the diamond particles is cohesively bonded to SiC.4. A process for producing SiC-bound hard diamond material particles as claimed in claim 1 , comprising the steps of admixing diamond particles with an organic binder and shaped into granules by drying and granulation process;subjecting the granules to a thermal treatment in an oxygen-free atmosphere, in which organic constituents are pyrolyzed and carbon is formed in situ from the organic binder in the course of pyrolysis and deposited in vitreous form on surfaces of the diamond particles;performing a silicization during the thermal treatment or in a subsequent second thermal treatment with admixed pulverulent silicon and particulate spacers;forming silicon carbide at the same time by chemical reaction with the carbon deposited on surfaces of diamond particles and/or with the diamond particles, to form hard material particles, wherein thediamond particles in the ...

OXIDE SINTERED BODY AND TRANSPARENT CONDUCTIVE OXIDE FILM

An oxide sintered body containing indium, hafnium, tantalum, and oxygen as constituent elements, in which when indium, hafnium, and tantalum are designated as In, Hf, and Ta, respectively, the atomic ratio of Hf/(In+Hf+Ta) is equal to 0.002 to 0.030, and the atomic ratio of Ta/(In+Hf+Ta) is equal to 0.0002 to 0.013. 1. A transparent conductive oxide film , comprising:an oxide including indium, hafnium, tantalum, and oxygen as constituent elements,wherein the oxide satisfies that an atomic ratio of Hf/(In+Hf+Ta) is equal to 0.002 to 0.030, and that an atomic ratio of Ta/(In+Hf+Ta) is equal to 0.0002 to 0.013, where In, Hf and Ta are indium, hafnium, and tantalum, respectively.2. The transparent conductive oxide film according to claim 1 , wherein the atomic ratio of Hf/(In+Hf+Ta) is equal to 0.005 to 0.025.3. The transparent conductive oxide film according to claim 1 , wherein the atomic ratio of Hf/(In+Hf+Ta) is equal to 0.007 to 0.021.4. The transparent conductive oxide film according to claim 1 , wherein the atomic ratio of Ta/(In+Hf+Ta) is equal to 0.001 to 0.010.5. The transparent conductive oxide film according to claim 1 , wherein the atomic ratio of Ta/(In+Hf+Ta) is equal to 0.003 to 0.010.6. The transparent conductive oxide film according to claim 1 , wherein the atomic ratio of Hf/(In+Hf+Ta) is equal to 0.005 to 0.025 claim 1 , and the atomic ratio of Ta/(In+Hf+Ta) is equal to 0.001 to 0.010. The present application is a divisional of and claims the benefit of priority to U.S. application Ser. No. 16/078,488, filed Aug. 21, 2018, which is the National Stage of the International Patent Application No. PCT/JP2017/006045, filed Feb. 20, 2017, which is based upon and claims the benefit of priority to Japanese Patent Application Nos. 2016-031403, filed Feb. 22, 2016, and 2016-223540, filed Nov. 16, 2016. The entire contents of all of the above applications are incorporated herein by reference.The present invention relates to an oxide sintered body, a sputtering ...

MATERIAL INCLUDING BORON SUBOXIDE AND METHOD OF FORMING SAME

A material including a body including BOcan include lattice constant c of at most 12.318. X can be at least 0.85 and at most 1. In a particular embodiment, 0.90≤X≤1. In another particular embodiment, lattice constant a can be at least 5.383 and lattice constant c can be at most 12.318. In another particular embodiment, the body can consist essentially of BO. 1. (canceled)2. A material , having a body comprising BO , wherein:X=(Xa+Xc)/2, wherein Xa=(A−5.26)/0.1347, Xc=(C−12.410)/(−0.10435), A represents a value of lattice constant a, and C represents a value of lattice constant c; and0.85≤X≤1.2.3. The material of claim 2 , wherein the body comprises a length claim 2 , a width claim 2 , and a thickness.4. The material of claim 3 , wherein the length is greater than the width and the thickness.5. The material of claim 2 , wherein the body comprises a volume of at least 108 cm3.6. The material of claim 2 , wherein Xc is at least 0.89.7. The material of claim 2 , wherein A is at least 5.396.8. The material of claim 2 , wherein C is at most 12.318.9. An armor component claim 2 , comprising a body including the material of .10. The material of claim 2 , wherein the body has:a minimum thickness of 2 mm;a width of at least 10.0 cm; ora combination thereof.11. A material claim 2 , having a body comprising:a length, a width, and a thickness; and{'sub': 6', 'X', '6', 'X, 'BO, wherein the BOcomprises lattice constant a and lattice constant c, wherein A represents a value of constant a, and C represents a value of constant c, wherein C is at most 12.318.'}12. The material of claim 11 , wherein X=(Xa+Xc)/2 claim 11 , wherein Xa=(A−5.26)/0.1347 claim 11 , Xc=(C−12.410)/(−0.10435) claim 11 , A represents a value of lattice constant a claim 11 , and C represents a value of lattice constant c claim 11 , and wherein 0.85≤X≤1.2.13. The material of claim 11 , wherein the body is essentially free of an intentionally added sintering aid.14. The material of claim 11 , wherein the body ...

Process of manufacturing of soft magnetic ceramic and its use

A process for the manufacture of magnetic ceramic is provided including the steps of: die compacting a powder composition into a compacted body, the composition including a mixture of soft magnetic, iron or iron-based powder, core particles of which are surrounded by an electrically insulating, inorganic coating an amount of 1 to 35% by weight of the composition; and heating and pressing the compacted body in an atmosphere to a temperature and a pressure below the decomposition temperature and pressure of the magnetic, iron or iron-based powder.

Ceramic material, method for producing the ceramic material, and electroceramic component comprising the ceramic material

The invention relates to a ceramic material, comprising lead zirconate titanate, which additionally contains K and optionally Cu. The ceramic material can be used in an electroceramic component, for example a piezoelectric actuator. The invention also relates to methods for producing the ceramic material and the electronic component.