Silicon carbide has good corrosion resistance, not easy to be acid, alkali, salt corrosion, can resist high temperature in the corrosion environment; With good thermal stability, can withstand high temperature environment; With high hardness, wear resistance, can resist wear; With good conductivity and insulation, can be used as electronic components; With high surface finish, can be used as mirror material; Also has good machinability, can make a variety of complex parts.