Silicon carbide special ceramics have high hardness, high wear resistance, low friction coefficient, strong oxidation resistance, good thermal stability, low coefficient of thermal expansion, high thermal conductivity and chemical corrosion resistance, and can adapt to work under special working conditions such as high pressure, high speed, strong corrosion and sediment. Products are widely used in machinery, metallurgy, chemical industry, pump valve, automobile, petroleum, military industry, aerospace and other fields.