Production method of silicon carbide micropowder for pressureless sintering

Abstract

The invention discloses a production method of silicon carbide micro powder applied to pressureless sintering, belongs to the technical field of production of silicon carbide micro powder and solves the problems of purification difficulty and material collection difficulty caused by firstly grinding and then purifying in the prior art. The method comprises the following steps: (1) selecting a material; (2) stirring by adding silicon carbide micro powder into a stirring barrel and adding deionized water for stirring; (3) carrying out acid pickling by adding mixed acid into the silicon carbide micro powder and stirring for reacting; (4) carrying out pressure filtration washing by dewatering the material and washing the material till pH is 5-7; (5) drying and crushing by adding the dried material into a steam kinetic energy mill, and crushing till the D50 value of the material is not greater than 0.5 micron; and (6) granulating and drying by adding ingredients into the crushed material, mixing, then adding deionized water for regulating a solid-to-liquid ratio, and carrying out spray granulation after the material and the ingredients are uniformly mixed. The method is suitable for producing silicon carbide micro powder applied to pressureless sintering.

Description

technical field [0001] The invention relates to a production method of silicon carbide micropowder for pressureless sintering, belonging to the technical field of silicon carbide micropowder production. Background technique [0002] With the development of science and technology, especially the high development of energy and space technology, the requirements for materials are getting higher and higher. Pressureless sintered silicon carbide micropowder is mainly used in silicon carbide ceramics, such as mechanical seals, bulletproof plates, armor plates, Bearings, shaft sleeves, heat exchangers, honeycomb ceramics, etc. This requires that the material must have superior properties such as high temperature resistance, corrosion resistance, and wear resistance, so that it can be used in a relatively harsh working environment. Because silicon carbide pressureless sintered ceramic materials have excellent properties such as strong oxidation resistance, good wear resistance, hig...

AI Technical Summary

Problems solved by technology

The disadvantages of these two methods are low work efficiency, large water consumption, high production cost, difficulty in material purification and collection, and serious material loss.

[0004] On January 29, 2014, the Chinese invention patent "Acid Washing and Purification Method for Submicron Silicon Carbide Powder" with the application number 201310507885.X was published. This process is for the purification of submicron ultrafine powder. During the operation, it will be difficult to collect ultra-fine powder and the phenomenon of material running out will be serious