Silicon carbide (SiC) ceramics not only have excellent normal temperature mechanical properties, excellent oxidation resistance, good corrosion resistance, high wear resistance and low friction coefficient, but also high temperature mechanical properties (strength, creep resistance, etc.). The high temperature strength of hot pressing sintering, pressureless sintering and hot isostatic pressing sintered materials can be maintained up to 1600 ℃, which is the material with the best high temperature strength among ceramic materials. The oxidation resistance is also the best among all non-oxide ceramics.