Material Structure Of Silicon Carbide

Pure silicon carbide is a colorless and transparent crystal. Industrial silicon carbide is pale yellow, green, blue or even black due to the type and content of impurities, and its transparency varies with its purity. The crystal structure of silicon carbide is divided into hexagonal or rhombohedral α-SiC and cubic β-SiC (called cubic silicon carbide). α-SiC constitutes many different variants due to the different stacking sequences of carbon and silicon atoms in its crystal structure, more than 70 species have been discovered. β-SiC is transformed into α-SiC when the temperature is above 2100°C. The industrial method of silicon carbide is to use high-quality quartz sand and petroleum coke to refine it in a resistance furnace. The smelted silicon carbide blocks are crushed, washed with acid and alkali, magnetic separation and sieving or water separation to produce products of various particle sizes.