The Material Structure Of Silicon Carbide

Pure silicon carbide is a colorless and transparent crystal. Industrial silicon carbide appears as light yellow, green, blue, or even black depending on the type and content of impurities it contains, 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 (known as cubic silicon carbide). Due to the different stacking sequences of carbon and silicon atoms in its crystal structure, α - SiC forms many different variants, and more than 70 have been discovered. β - SiC transforms into α - SiC above 2100 ℃. The industrial production method of silicon carbide is to refine high-quality quartz sand and petroleum coke in a resistance furnace. The refined silicon carbide blocks are processed into products of various particle sizes through crushing, acid-base washing, magnetic separation, screening, or water selection.