Pressureless sintered silicon carbide ceramics is a new type of bulletproof ceramic material, which has the advantages of low density, high strength, high temperature resistance, oxidation resistance, corrosion resistance and other excellent performances. It is currently the preferred general material for manufacturing ceramic bulletproof piece, mechanical seal, sandblast nozzle and other components. The pressureless sintered silicon carbide ceramics of our company have compact internal structure, small grain size and excellent bulletproof performance.