Surface modification method of silicon carbide micropowder

Abstract

The invention relates to a surface modification method of silicon carbide micropowder. Two modifying agents are adopted to perform two-step dry modification of the silicon carbide micropowder. The surface modification method comprises steps of: preparing an ethanol solution of a silane coupling agent and an aqueous solution of water-soluble polymer, preheating the silicon carbide micropowder at 30-70 DEG C for 20-60 min, spraying the ethanol solution of the silane coupling agent in a form of mist into the silicon carbide micropowder stirred at a high speed, stirring and drying at 110-150 DEG C for 0.5-3 h, spraying the aqueous solution of the water-soluble polymer preheated to 30-80 DEG C in a form of mist into the silicon carbide micropowder stirred at a high speed, and stirring and drying at 110-150 DEG C for 0.5-3 h to obtain surface modified silicon carbide micropowder. The surface modification method aims at dry-method modification of the silicon carbide micropowder, and is capable of effectively solving the dispersibility problem of the dispersibility, and improving the uniformity and increasing the powder yield of granulation of the silicon carbide micropowder.

Description

technical field [0001] The invention relates to a method for treating silicon carbide micropowder, in particular to a method for surface modification of silicon carbide micropowder. 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 excellent performanc...

AI Technical Summary

Problems solved by technology

Wet modification has disadvantages such as high energy consumption, poor particle dispersion, long production cycle, high labor intensity, and poor product stability.

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