Superfine tungsten carbide powder as well as preparation method and application thereof

The invention provides superfine tungsten carbide powder as well as a preparation method and application thereof. The method for preparing the superfine tungsten carbide powder comprises the following steps: (1) mixing ammonium metatungstate, a chromium-containing inhibitor and water to obtain a mixed material liquid; (2) carrying out spray granulation on the mixed material liquid so as to obtain a chromium-doped precursor; (3) the chromium-doped precursor is subjected to heat preservation in an inert atmosphere and then subjected to heating reduction in a hydrogen atmosphere, and tungsten dioxide is obtained; (4) mixing tungsten dioxide and carbon black to obtain a mixture; (5) carrying out a reduction reaction on the mixture in a hydrogen atmosphere, and then heating in an inert atmosphere to carry out a carbonization reaction so as to obtain superfine tungsten carbide powder; wherein in the step (3), the flow rate of the hydrogen atmosphere is 150-250 L/h, the temperature is increased ...

High-fluidity pure-phase tungsten diboride and preparation method thereof

The invention discloses high-fluidity pure-phase tungsten diboride and a preparation method thereof.The method comprises the steps that (1) tungsten powder, boron powder and grinding balls are mixed and subjected to ball milling, so that tungsten-boron mixed powder is obtained; (2) carrying out pressure sintering on the tungsten-boron mixed powder in an inert atmosphere so as to obtain pure-phase tungsten diboride powder; (3) carrying out self-mixing on the pure-phase tungsten diboride powder; and (4) screening the self-mixed tungsten diboride powder so as to obtain the high-fluidity pure-phase tungsten diboride. The tungsten diboride prepared by the method is single in phase, free of other impure phases and high in flowability.

Bounce vehicle

The invention relates to individual body building devices and in particular relates to an amusement body building instrument which is driven by pedals and can jump up and down, mainly solving the problems that current body building instruments are single in exercise form and can not arouse the interest of the user in body building. The bouncing vehicle is mainly composed of a front arm, a back arm, a front pull rod, forming a diamond plane link structure; a front wheel and a back wheel which are capable of unidirectional rotation are respectively arranged on the extension lines below the front arm and the back arm; a storage compression spring is arranged between the pivot joint of the front arm and the back arm and the pivot joint of the front pull rod and the back pull rod; the amusement body building instrument is further provided with indispensable components such as a steering rod and a brake. When the bouncing vehicle is in use, the movement of the user forms unidirectional pulse ...

Electric locomotive off-shift operation safe monitoring system

The present invention relates to the technological field of operating safety network control of electric locomotive preparation, and in particular to an operating safety monitoring system of the electric locomotive preparation. The monitoring system comprises a monitoring machine (1) which is connected with a main station PLC module (2); the main station PLC module (2) is connected with a communication module (3) through a field bus; the communication module (3) is connected with a slave station PLC module (4); an ID card reader (5), an actuator (6), and a visualized input and output system (7) are respectively connected with the slave station PLC module (4); the actuator (6) and a vehicle roof image camera (8) are correspondingly arranged on a standing column (10) which is arranged on one side of a track for the electric locomotive preparation; the vehicle roof image camera (8) is connected with the monitoring machine (1) through a video board card (9). The monitoring system greatly shortens ...

Special compound feed for pseudobagrus ussuriensis fries and advanced fries and a preparation method thereof

The present invention relates to feed for pseudobagrus ussuriensis fries and advanced fries, and belongs to the field of special compound feed and processing thereof. The special compound feed is good in palatability, balanced in nutrition, easily available in raw materials and pollution-free in aquaculture water body, and can improve the immunity of pseudobagrus ussuriensis fries and advanced fries. The feed is characterized in that the feed consists of the following ingredients in mass percentages: fish meal 30-40%, daphnia powder 20-30%, meat and bone meal 10-15%, full-fat soybean 10-15%, cottonseed meal 2-5%, beer yeast 2-5%, flour 1-7.5%, 1% calcium dihydrogen phosphate 1%, compound enzyme preparation 0.5%, immunopotentiator 0.5%, garlicin 0.01%, choline chloride 0.3%, liver and gallbladder Kang 0.5%, multi-vitamin premix 0.5% and multi-mineral premix 0.5%. The preparation process includes: raw material crushing, mixing, extruding and granulating. The feed is simple in process, balanced ...

Prussian blue sodium battery positive electrode material and preparation process thereof

The invention provides a Prussian blue sodium battery positive electrode material and a preparation process thereof. The preparation process of the Prussian blue sodium battery positive electrode material comprises the following steps: preparing activated carbon fibers from bamboo cellulose, modifying the activated carbon fibers with sodium hydroxide, adding a nickel chloride solution to carry out a coprecipitation reaction, carrying out ball milling, and mixing with modified activated carbon. The method for preparing the Prussian blue sodium battery positive electrode material is simple, cyanogen harmful substances generated by thermal decomposition of the material can be effectively absorbed by adding the activated carbon fibers, the pollution to the environment and the harm to the human body are reduced, and the material also has excellent electrochemical performance.

Multi-functional uriniferous apparatus

A multifunctional ureteral apparatus is composed of a job box consisting of a box body, a urine collecting bag, a ureter, a self-sucking pump with control valve, and a detergent storage cavity, and a sealed penis sleeve for man or a cover with a supporting head inserted in vagina for woman.

Rotary engine

The present invention relates to an engine, in particular to a rotary engine, which solves the problems of the prior engine, such as unreasonable structural design, complicated construction and low efficiency, etc. The rotary engine includes a cylinder composed of two communicated cylindrical internal cavities, an end cover fixed on the cylinder, a drive shaft and an output shaft supported by a bearing, two sets of rotary pistons arranged on the drive shaft, a seal wheel arranged on the output shaft and a synchronized gear arranged on the drive shaft and the output shaft. Two sets of chambers with variable volume and size composed of the cylinder, the drive shaft, the rotary piston and the seal wheel respectively complete the process of suction and compression and the process of explosion and drainage. The rotary engine has the advantages of novel concept, compact and reasonable structure, thus facilitating the construction. All the motion pieces are in stable one-way rotation and operation ...

Automatic sizing equipment and process for functional textile fabric

According to the automatic sizing equipment and process for the functional textile fabric, steam is continuously sprayed into a mounting pool through a steam guide assembly, an object placing sliding table is preheated and pre-wetted firstly, then the textile fabric on the object placing sliding table is wetted, and then the textile fabric on the object placing sliding table is wetted; the textile fabric slowly moving rightwards is uniformly swabbed through the slurry coating assembly, the arranged steam guide assembly can heat and wet the textile fabric and promote slurry to permeate the textile fabric more quickly, and meanwhile it is guaranteed that the slurry coating assembly can work in the warm and wet environment all the time, so that in the process that the slurry permeates the textile fabric, the slurry in the textile fabric is uniformly brushed, and the slurry is uniformly brushed. According to the sizing device for the textile fabric, good fluidity can be kept all the time, the ...

Preparation method and application of spherical pure-phase tungsten diboride

The invention discloses a preparation method and application of spherical pure-phase tungsten diboride. The preparation method comprises the following steps: (1) mixing tungsten powder and boron powder to obtain mixed powder; (2) heating and pressurizing the mixed powder in an oxygen-free atmosphere to obtain pure-phase tungsten diboride; (3) the pure-phase tungsten diboride is subjected to self-mixing treatment, and tungsten diboride self-mixing powder is obtained; and (4) the tungsten diboride self-mixing powder is subjected to spheroidizing treatment, and spherical pure-phase tungsten diboride is obtained. The method is simple in process and suitable for industrial production, and the prepared tungsten diboride is single in phase, free of other impure phases, high in sphericity rate, good in fluidity, high in apparent density and capable of meeting the use requirements of additive manufacturing.

Rotary engine

Full -automatic urine collector

The utility model discloses a full -automatic urine collector, including wall -hung stall urinal, be provided with the distance sensor and the executable module that surfaces in the wall -hung stall urinal, the execution surfaced or cuts off the water the order after the signal that comes from distance sensor was received to the executable module that surfaces, the wall -hung stall urinal lower part is provided with the urine and collects the container, also be provided with voltage sensor in the urine collection container, voltage sensor detects the urine and collects urine in the container and reach and set for when high signal transmission to the horn in. The utility model discloses an urine collector is compared with other rural urine collectors, is full automatic device, and full auto -induction need not people's operation, and does not have the stink to the mixture that the collection is good need not to add water to dilute and just can directly irrigate crops.

Electric locomotive off-shift operation safe monitoring system

The present invention relates to the technological field of operating safety network control of electric locomotive preparation, and in particular to an operating safety monitoring system of the electric locomotive preparation. The monitoring system comprises a monitoring machine (1) which is connected with a main station PLC module (2); the main station PLC module (2) is connected with a communication module (3) through a field bus; the communication module (3) is connected with a slave station PLC module (4); an ID card reader (5), an actuator (6), and a visualized input and output system (7) are respectively connected with the slave station PLC module (4); the actuator (6) and a vehicle roof image camera (8) are correspondingly arranged on a standing column (10) which is arranged on one side of a track for the electric locomotive preparation; the vehicle roof image camera (8) is connected with the monitoring machine (1) through a video board card (9). The monitoring system greatly shortens ...

Method for preparing Y-cut Z-propagation lithium niobate waveguide with 1310 nm wavelength and adjustable birefringence difference

The invention discloses a method for preparing a Y-cut Z-propagation lithium niobate waveguide with the 1310 nm wavelength and the adjustable birefringence difference. The birefringence difference ranges from 1.5 * 10<-5> to 4.8 * 10<-3>. The method for preparing the Y-cut Z-propagation lithium niobate waveguide includes the steps that a titanium film is evaporated on a completely-cleaned Y-cut lithium niobate wafer, wherein the thickness of the titanium film ranges from 65 nm to 105 nm; the titanium film is corroded, a titanium strip stretching in the Z direction of the Y-cut lithium niobate wafer is formed on the surface of the Y-cut lithium niobate wafer, and a chip comprising the Y-cut lithium niobate wafer and the titanium strip is obtained, wherein the width of the titanium strip ranges from 6 micron to 8.5 micron; the completely-cleaned chip is arranged in the environment with the set diffusion temperature, wherein wet oxygen flows into the environment, the chip is taken out after ...

Prefabricated pipe gallery translation pushing device

The invention belongs to the technical field of pipe gallery construction, and particularly relates to a prefabricated pipe gallery translation pushing device which comprises a tracked vehicle body, a fixing frame is fixedly connected to the top face of a vehicle head of the tracked vehicle body, a pushing arm is rotatably mounted in the middle of the fixing frame, and an extension arm is slidably mounted in the middle of the pushing arm. A horizontal beam is arranged at the end, away from the fixing frame, of the extension arm, and a pushing hydraulic cylinder is fixedly connected to the top of the pushing arm. A constructor controls the tracked vehicle body to be close to the prefabricated pipe gallery to be assembled, the pushing arm is kept in a horizontal state, the horizontal beam is attached to the middle of the prefabricated pipe gallery, the pushing hydraulic cylinder pushes the extension arm to slide from the middle of the pushing arm, the horizontal beam is pushed to move, the ...

Prefabricated partition board convenient to disassemble and assemble

The invention belongs to the technical field of partition wall boards, and particularly relates to a convenient-to-disassemble-and-assemble prefabricated partition wall board which comprises a first prefabricated partition wall board and a second prefabricated partition wall board. L-shaped clamping plates are fixedly mounted on the left side and the right side of the first prefabricated partition wall plate; u-shaped frames are fixedly mounted on the left side and the right side of the second prefabricated partition wall board. The length of the U-shaped frame is matched with that of the L-shaped clamping plate; a plurality of transverse shafts are fixedly mounted on the surface of the U-shaped frame; when the L-shaped clamping plate is completely clamped into the U-shaped frame, the highest points of the first arc-shaped plate and the second arc-shaped plate at the corresponding positions can abut against each other, under the mutual pressure of the first arc-shaped plate and the second ...

Automatic spray-dyeing device for real silk fabric after printing

The invention relates to the technical field of silk fabric spray-dyeing, in particular to an automatic silk fabric after-printing spray-dyeing device which comprises a main body, a fabric inlet cylinder is rotatably mounted on the rear portion of the main body through an arranged supporting inclined frame, and a fabric outlet cylinder is rotatably mounted on the front portion of the main body through an arranged supporting inclined frame. And a flour cleaning mechanism is arranged on the rear side wall of the main body. Thread residues and impurities adhered to the rolling hair removal cylinder can be quickly and intensively removed through the hair removal part, the situation that too many impurities adhere to the rolling hair removal cylinder, so that the hair removal efficiency is reduced, and the spray-dyeing effect of the real silk fabric is damaged is avoided, the lower portion of the real silk material is supported in the spray-dyeing process, and the spray-dyeing effect of the ...