A kind of preparation method of reaction sintered silicon carbide ceramics

Abstract

The invention discloses a method for preparing reaction sintered silicon carbide ceramics. Firstly, waste silicon carbide powder, silicon carbide powder material, adhesive and solvent are added into a ball mill in proportion, and then the mixed powder is put into a drying oven to dry, and then Put the powder into the mold, pressurize it into a blank, then crush the blank, sieve, and then evenly distribute the sifted powder in the cavity of the mold, mold it again into a green body, and heat up and dry it after debinding , place the green body in a graphite crucible, add metal silicon into the crucible, put the crucible into a high-temperature vacuum sintering furnace for sintering, and then lower the temperature to obtain a reaction-sintered silicon carbide ceramic. The invention has a simple process and is suitable for large-scale industrial production, and can not only effectively solve the problems of environmental pollution and resource waste caused by a large amount of silicon carbide waste, but also reduce the raw material price of reaction sintered silicon carbide materials.

Description

technical field [0001] The invention relates to a preparation method of reaction sintered silicon carbide ceramics, in particular to a preparation method of reaction sintered silicon carbide ceramics. Background technique [0002] Among all kinds of silicon carbide ceramics, reaction sintered silicon carbide material is an important structural ceramic material, which has a series of advantages such as net size molding, high strength, high hardness, and good corrosion resistance; currently, a reaction sintered silicon carbide is prepared. Series products, such as nozzles, square beams, protective tubes, etc., occupy an important position in my country's structural ceramics industry. At present, the green body raw material is basically α-SiC, plus carbon sources (such as petroleum coke, carbon black, graphite, etc.) Bond the original silicon carbide particles to obtain high-performance silicon carbide ceramics. [0003] The continuous exploitation and use of non-renewable ene...

AI Technical Summary

Problems solved by technology

Silicon carbide block materials are generally processed into silicon carbide powder through a series of processes such as crushing, ball milling, screening, water washing, pickling, overflow, etc. Among them, the general carbon removal process for impurity carbon is to use hair in the production process of silicon carbide powder. Bubble method, through the adsorption and separation of silicon carbide and carbon on the surface of the foam, it is inevitable that some silicon carbide powder will be entrained, resulting in mixed waste of silicon carbide and carbon

pollute the environment and cause a lot of waste of resources