Black silicon carbide

Silicon carbide is mainly divided into black silicon carbide and green silicon carbide. Silicon carbide is also called moissanite. Silicon carbide is a kind of carbide accidentally discovered in the laboratory by American Acheson during the electrofusion diamond experiment in 1891. At that time, it was mistaken for a mixture of diamonds. It was researched by Acheson in 1893. The industrial method of smelting silicon carbide, which is commonly referred to as the Acheson furnace, has been used until now. The resistance furnace with carbonaceous material as the furnace core is energized to heat the mixture of quartz SiO2 and carbon to produce silicon carbide. Black silicon carbide's hardness is between corundum and diamond, its mechanical strength is higher than corundum, and it is brittle and sharp. Black silicon carbide has a metallic luster and contains more than 95% SiC. Black silicon carbide has greater strength than green silicon carbide but lower hardness. It is mainly used for grinding cast iron and non-metallic materials.

The industrial manufacturing method of black silicon carbide is to use high-quality quartz sand and petroleum coke to be refined in a resistance furnace. The refined silicon carbide blocks are crushed, washed with acid and alkali, magnetic separation, sieving or water selection to produce products of various particle sizes.