Silicon carbide (SIC) is made from quartz sand, petroleum coke (or coal coke) and sawdust through high-temperature smelting in a resistance furnace. Silicon carbide also has a rare mineral in nature, morsonite. Silicon carbide is also called carbon silica. Silicon carbide is the most widely used and economical non oxide high-tech refractory raw materials such as C, N and B. It can be called steel sand or refractory sand. Silicon carbide is made of quartz sand, petroleum coke (or coal coke), sawdust (salt needs to be added in the production of green silicon carbide) and other raw materials through high-temperature smelting in a resistance furnace. At present, China's industrial production of silicon carbide is divided into black silicon carbide and green silicon carbide, both of which are hexagonal crystals, with a specific gravity of 3.20 ~ 3.25 and a microhardness of 2840 ~ 3320kg / mm2.