The invention belongs to the technical field of preparation of non-oxide ceramic powder and particularly relates to a method for preparing non-oxide ceramic ultrafine powder based on a solvent thermal polymerization reaction The method is used for solving such problems in the prior art as complicated process, non-uniform product particle size and low purity The method comprises the following steps: dissolving an organic precursor monomer or a mixture of non-oxide ceramic in toluene or dimethylbenzene, adding divinylbenzene to serve as a crosslinking agent, and then, carrying out solvent thermal polymerization; drying and grinding the polymerization product, and carrying out high temperature pyrolysis under the protection of an inert gas to obtain ultrafine powder of such monomer ceramics as SiC, BN, ZrC, HfC and WC and such composite ceramics as SiC-ZrC, SiC-ZrB2 and SiC-BN The method provided by the invention has the advantages of simple process, no complicated equipment and the like, is convenient to operate, easily realizes industrialized production, and the non-oxide ceramic powder has the advantages of uniform particle size, small particle, high purity and the like, so that the non-oxide ceramic powder is widely applied in the preparation of corresponding non-oxide ceramic raw materials and raw materials of hard alloys or oxidation resistant coatings

Method for preparing non-oxide ceramic ultrafine powder based on solvent thermal polymerization reaction

Carbonitride field emission cathode preparation method

An electrophoresis-type cutting system and a method for manufacturing an electrophoresis-type cutting carrier are provided The electrophoresis-type cutting system is applied to the cutting process of base materials, and comprises a receiving tank, a first electrode plate, a cutting carrier, a second electrode plate and transmission units The receiving tank stores a supernatant solution containing abrasive particles and applies a first voltage, and the cutting carrier applies a second voltage, so an electric field is formed in the receiving tank by the first voltage and the second voltage, and electrophoretic separation of the abrasive particles is generated, and the supernatant solution breaks away and attaches to the surface of the cutting carrier, so as to form the cutting carrier with the abrasive particles An electrophoretic deposition method is adopted to deposite the abrasive particles on the surface of the cutting carrier, so as to reduce losses of notches caused by the cutting carrier when the base material is cut, and effectively raise the usage rate of the abrasive in the supernatant solution

Electrophoresis-type cutting system and method for manufacturing electrophoretic cutting carrier

The invention provides a field emission cathode with double-layer nano-carbon coating and a preparation method. The preparation method includes the steps: firstly, coating nano-diamond on a substrate by an electrophoretic deposition method to form a nano-diamond coating; coating a nano-carbon tube on the nano-diamond coating by the electrophoretic deposition method to form a nano-carbon tube coating; finally, performing heat treatment in a hot filament chemical vapor deposition system, and performing chemical bonding reaction of the substrate and the nano-diamond coating to obtain a chemical bonding layer. The field emission cathode is provided with a four-layer structure with the substrate, the chemical bonding layer, the nano-diamond coating and the nano-carbon tube coating, simultaneously has the advantages of the nano-carbon tube and the nano-diamond, and has fine field emission characteristics and field emission stability.

Field emission cathode with double-layer nano-carbon coating and preparation method

The invention discloses a manufacturing method for a mechanical sealing ring with cold friction characteristic and provided with a diamond coating layer. The manufacturing method comprises the following steps: A. taking a low-cobalt hard alloy sealing ring or a silicon carbide sealing ring as a matrix, grinding a sealing surface of the matrix, and carrying out uniform crystal distribution; B. carrying out acid treatment and hydrogen plasma treatment on the sealing surface of the matrix; the acid treatment is soaking the sealing surface of the matrix with dilute acid; and the hydrogen plasma treatment is heating for 20min-80min under a micro-positive pressure and at 900-1100 DEG C, in a hydrogen atmosphere containing a carbon source gas with a concentration of 0.1%-1%; C. heating the matrixthrough a spatial hot wire array, uniformly charging a reaction gas from a plurality of points, and applying a direct-current negative bias voltage between the spatial hot wire array and the matrix,and depositing, wherein a heating temperature is 800-950 DEG C; a bias current is 1A-5A; a gas pressure is 1.0-4.0kPa; and a deposition time is 2-7h; and D. polishing the deposited matrix to obtain the uniform and compact mechanical sealing ring provided with the diamond coating layer and having a thickness of 5-10[mu]m. The method is capable of greatly lowering an end surface temperature from thenature of materials, and prolonging the working life of the sealing ring.

Manufacturing method for mechanical sealing ring with cold friction characteristic and provided with diamond coating layer

The invention discloses a manufacturing method of a field emission cathode of a large-area nano diamond coating. In the method, a titanium piece is selected as a substrate, a nano diamond coating is deposited on the substrate by utilizing an electrophoresis method, and a TiC transition layer is generated between the substrate and the diamond coating through HFCVD heat treatment by bonding. The manufacturing method of the field emission cathode of the large-area nano diamond coating comprises the following steps of: firstly, carrying out polishing treatment on the substrate of the titanium piece, then depositing nano diamond particles on the substrate by utilizing the electrophoresis method, and finally, processing the surface of the cathode by adopting hydrogen plasma so as to enhance the field emission property. Because the transition layer is generated between the substrate and the diamond coating by bonding, the plane field emission cathode of the diamond coating, which is prepared by the invention, provides an interface potential barrier of electronic resonant tunneling and realizes the injection of high-density electron. Meanwhile, the adhesion property of nano diamond and the substrate is also reinforced. The method can prepare a large-area FED cathode and has simple process, low cost and easy popularization.

Preparation method of field emission cathode of large-area nano diamond coating

The invention discloses a method for synthesizing a silicon nitride nanorod crystalline semiconductor material at low temperature by a solvothermal method, which comprises the following steps of: adding silica fume, sodium azide and iodine into a high-pressure reaction kettle according to the mass ratio of 0.3:3:8, and evenly stirring with a glass rod; sealing the reaction kettle and then putting the reaction kettle in an oven, and heating to 200-250 DEG C, keeping heating for 15 hours at 200-250 DEG C, and then naturally cooling to the room temperature, and collecting a product after the reaction; washing the collected product with anhydrous ethanol, deionized water, a HNO3 and HF mixture and distilled water in sequence; and finally, dehydrating the product with anhydrous ethanol to obtain the silicon nitride nanorod crystalline semiconductor material. The silicon nitride nanorod crystal with the diameter of 100nm, high purity and good quality can be prepared by the method, and the method uses simple experimental devices and is convenient to operate; and the method provided by the invention has low requirements on the control of growth parameters and the like, and is convenient for the industrial mass production.

Method for synthesizing silicon nitride nanorod crystalline material at low temperature by solvothermal method

Aminothiourea-assisted low-temperature synthesis method of silicon nitride micron rod-like crystal material

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Preparation method of field emission cathode of large-area nano diamond coating

Method for synthesizing silicon nitride nanorod crystalline material at low temperature by solvothermal method

Aminothiourea-assisted low-temperature synthesis method of silicon nitride micron rod-like crystal material