Surface modification method of silicon carbide powder for recrystallization

Abstract

The invention discloses a surface modification method of a silicon carbide powder for recrystallization, and belongs to the technical field of silicon carbide production. The invention solves the problems of high cost, long production cycle, high labor intensity, low solid content of the obtained product in the preparation of a silicon carbide slurry for recrystallization, and unsuitability for slip-casting in the prior art. The method includes the following steps: a mixed modifier and deionized water with conductivity of 30-50 mus / cm into a mixing tank, mixing by stirring for 20-50 min; adding a silicon carbide powder into the mixing tank, mixing by stirring for 20-50 min; adding a silicon carbide grinding medium into a mixing tank, mixing by stirring for 55-60 h; sieving the mixed material through a screen, and screening out the silicon carbide grinding medium; drying and crushing the material without the silicon carbide grinding medium, sieving through a screen of 300-500 mesh to obtain the modified silicon carbide powder for recrystallization. The invention can be used for surface modification of silicon carbide powder for recrystallization.

Description

technical field [0001] The invention relates to a method for surface modification of silicon carbide micropowder for recrystallization, belonging to the technical field of silicon carbide production. Background technique [0002] Silicon carbide ceramics have excellent characteristics such as high temperature strength, strong oxidation resistance, good wear resistance, good thermal stability, small thermal expansion coefficient, high thermal conductivity, high hardness and chemical corrosion resistance. Therefore, it has shown its talents in many fields and has been paid more and more attention by people. For silicon carbide ceramics, the preparation of uniform and stable dispersed powder is the key to successful sintering. However, due to the small particle size and high surface energy of silicon carbide powder, it is easy to cause agglomeration and form secondary particles, which makes it difficult to exert the advantages of ultrafine powder, and ultimately affects the ex...

AI Technical Summary

Problems solved by technology

However, due to the small particle size and high surface energy of silicon carbide powder, it is easy to cause agglomeration and form secondary particles, which makes it difficult to exert the advantages of ultrafine powder, and ultimately affects the excellent performance of the finished product

[0003] Existing modification methods of silicon carbide micropowder for recrystallization include wet method and dry method, wherein wet method modification has disadvantages such as high energy consumption, poor particle dispersibility, long production cycle, high labor intensity, and poor product stability. Moreover, the solid content of the obtained product is low when preparing silicon carbide slurry for recrystallization, and cannot be used for molding such as grouting.