Silicon carbide is a nonmetallic carbide composed of silicon and carbon by valence bond, and its hardness is second only to that of diamond and boron carbide. The chemical formula is SiC Colorless crystal, blue-black or containing impurities when oxidized. Silicon carbide variants with diamond structure are usually called emery.

Use:

1. In the electrical industry, silicon carbide can be used as arrester valve body, silicon carbon electric heating element, far infrared generator, etc.

2. In the aerospace industry, gas filters and combustion chamber nozzles made of silicon carbide have been used in rocket technology.

3. Low-grade silicon carbide can be used as deoxidizer for steelmaking and additive for cast iron.

4. In the carbon industry, silicon carbide can be used to produce bricks for ironmaking blast furnaces, such as graphite silicon carbide and silicon nitride bonded silicon carbide bricks.

5. In the production of graphite electrodes, silicon carbide is also used to match the coating refractory sintering materials of oxidation-resistant coated electrodes, so as to increase the coating's ability to withstand sudden temperature changes.

6. Propane and trichloromethylsilane are often used as gas materials in the manufacture of special carbon materials-biochar, and a pyrolytic carbon coating containing silicon is deposited on the graphite substrate after pyrolysis reaction at high temperature to increase the hardness, strength and wear resistance of the product.