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Ceramic powder preparation method based on freeze casting molding

A technology of freezing casting and ceramic powder, which is applied in ceramic molding machines, manufacturing tools, etc., can solve the problem of difficult preparation of ceramic powder in large quantities, achieve airflow control and anti-pollution functions, facilitate handling, and increase furnace capacity. Effect

Active Publication Date: 2021-02-23
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing ceramic powder based on freeze-casting molding, which solves the problem of macro-preparation of ceramic powders such as nitrides and nitrogen oxides that require high-temperature gas-solid synthesis reactions in the prior art

Method used

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  • Ceramic powder preparation method based on freeze casting molding
  • Ceramic powder preparation method based on freeze casting molding
  • Ceramic powder preparation method based on freeze casting molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]The Alon powder was prepared using a ceramic powder preparation method based on frozen casting, and specifically includes the following steps:

[0038](1) Weigh a certain amount of micron γ-A12O3Powder, high-purity carbon black powder, polyvinylpyrrolidone, ammonium citrate, tert-butanol, and alumina grinding balls, borne mill mill grinding in a polyurethane ball grinding tank, and obtains a solid phase content of 45 % Slurry;

[0039](2) Injecting the slurry into the molded mold (the heat transfer bottom plate of the mold is a steel sheet, the insulation is nylon, and the occupying rod is polytetrafluoroethylene), and the molded mold is placed in an alcohol cooling medium of -80 ° C. Placed in 4 h, then releases the feed blank of the condensed condensate into a cryogenic dryer to dry the temperature of -30 ° C for 24 h, resulting in a raw material blank having an internal via structure (seefigure 1 );

[0040](3) The above-mentioned raw material blank is placed in a ceramic powder rea...

Embodiment 2

[0043]ALN powder was prepared using a ceramic powder preparation method based on frozen casting, and specifically includes the following steps:

[0044](1) Weigh a certain amount of nanoscale α-A12O3Powder, high purity carbon black powder, polyvinyl alcohol, tetramethylammonium hydroxide, deionized water and alumina grinding ball, loaded into a polyurethane spherical grinding tank, a rod mill mill mill mill mill mill, obtained Phase content is 50% slurry;

[0045](2) Injecting the slurry injecting the molded mold (the mold is identical to the first embodiment), the molding die is placed in an alcohol cooling medium having a temperature of -60 ° C, then removes the raw material blank of the condensed solid. The inlet dryer was dried in a freeze dryer at -20 ° C for 24 h to obtain a raw material blank having an internal via structure;

[0046](3) The above-mentioned raw material blank is placed in a ceramic powder reaction apparatus in the high temperature graphite sintered furnace to perform ...

Embodiment 3

[0049]Mgalon powder was prepared using a ceramic powder preparation method based on frozen casting, including the following steps:

[0050](1) Weighing nanoscale γ-Al2O3 powder, nanoscale MgO powder, high purifu carbon black powder, carboxymethylcellulose, ammonium polyacrylate, water, tert-butanol, and alumina grinding ball, is loaded into a polyurethane sphere, The ball milling of the solid phase content of 40% was obtained at a rough mill of 500r / min.

[0051](2) Injecting the slurry into the molding mold (the mold is identical to the first embodiment), the molding die is placed in an alcohol cooling medium having a temperature of -40 ° C, and then removes the raw material blank of the condensed solid. The inlet dryer was dried in a freeze dryer at -20 ° C for 24 h to obtain a raw material blank having an internal via structure;

[0052](3) The above-mentioned raw material blank is placed in a ceramic powder reaction apparatus in the high temperature ink sintered furnace to perform high...

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Abstract

The invention discloses a ceramic powder preparation method based on freezing casting molding. The method comprises the following steps: (1) mixing a powder raw material, a solvent and an additive toobtain slurry with the solid phase content of 30-70wt%; (2) converting the slurry into a raw material blank with an internal through hole structure by adopting freezing casting molding and vacuum freeze drying processes and utilizing a temperature gradient formed by a mold; (3) putting the raw material blank into a reaction device with airflow control and anti-pollution functions in a high-temperature graphite sintering furnace, and carrying out high-temperature synthesis in a controlled reaction environment; and (4) carrying out ball milling and carbon removal process treatment on the raw material blank synthesized at high temperature to obtain the high-purity ceramic powder. The method can be used for macroscopic preparation of ceramic powder such as nitride and nitric oxide based on high-temperature gas-solid synthesis reaction, and has good application prospect and popularization value.

Description

Technical field[0001]The present invention relates to the field of preparation of powder, and more particularly to a method for preparing a ceramic powder based on freezing casting.Background technique[0002]Ceramic materials such as nitride, nitrogen oxides (eg, Aln, Si3N4, Alon, Mgalon, Sialon, etc., generally has excellent strength, high hardness, high temperature, corrosion resistance, wear resistance, etc., some materials have good insulation, low dielectric constant, high translational performance unique properties, There is a very broad application prospect in the military and civilian fields. However, the macro amount of the macro amount of the high-purity powder of such ceramics in China has not been broken, so that the application of these ceramic materials has been greatly restricted.[0003]In the synthesis method of ceramic powder such as nitride, nitrogen oxynitride, carbon-thermal reduction nitriding method is a method of researching maximum and most industrial developme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/626C04B35/58C04B35/581B28B1/14B28B11/24
CPCC04B35/62605C04B35/62615C04B35/62675C04B35/58C04B35/581B28B1/14B28B11/243C04B2235/6567C04B2235/46C04B2235/465C04B2235/3869C04B2235/606
Inventor 岳映雷徐婷婷
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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