Silicon carbide (SiC), also named carborundum, is a ceramic-like compound formed by bonding silicon and carbon.  Since the end of the 19th century, silicon carbide has become an important material for sandpaper, grinding wheels, and cutting tools.  Silicon carbide powder has a black color when the purity is low and products with purity higher than 90% is green.Recently, its application has been found in refractory linings and heating elements of industrial furnaces, wear parts of pumps and rocket engines, and semiconductor substrates of light-emitting diodes.