Silicon carbide (SiC) is produced by high-temperature smelting of electric furnaces such as quartz sand, petroleum coke (or coal char), and wood chips (which require the addition of salt when producing green silicon carbide). Silicon carbide is also a rare mineral in nature, Moissanite. Silicon carbide is also known as carbon silica.
Among the non-oxide high-tech refractory raw materials such as C, N and B, silicon carbide is the most widely used and economical one, and it can be called gold steel sand or refractory sand. At present, China's industrial production of silicon carbide is divided into black silicon carbide and green silicon carbide, both hexagonal crystals, specific gravity of 3.20 ~ 3.25, microhardness of 2840 ~ 3320kg / mm2.
Silicon Carbide is a kind of carbide accidentally discovered by the American Acheson in the 1891 fused diamond experiment. It was mistaken for a mixture of diamonds at that time, so it was named Emery. In 1893, Acheson came out. The method of industrial smelting of silicon carbide, which is commonly known as the Acheson furnace, has been used until now, with a carbonaceous material as the core of the resistance furnace, energized to heat the mixture of quartz SIO2 and carbon to form silicon carbide.
Due to the low natural content, silicon carbide is mostly artificial. The common method is to mix quartz sand with coke, use the silica and petroleum coke, add salt and wood chips, put it into an electric furnace, heat it to a high temperature of about 2000 °C, and obtain silicon carbide powder after various chemical processes. .