Silicon carbide is also known as gold steel sand or refractory sand. Silicon carbide is made of quartz sand, petroleum coke (or coal coke, wood chips production of green silicon carbide, need to add salt and other raw materials in the resistance furnace by high temperature smelting. At present, industrial production of silicon carbide is divided into black silicon carbide and green silicon carbide two kinds, are hexagonal crystals, specific gravity of 3.90g/cm3.
Black silicon carbide is made of quartz sand, petroleum coke and fine silica as main raw materials by high temperature smelting resistance furnace. Its hardness is between corundum and diamond and its mechanical strength is higher than corundum. It is brittle and sharp.