Black silicon carbide materials include what are

Including black silicon carbide and green silicon carbide, wherein: Black silicon carbide is quartz sand , petroleum coke and quality silica as the main raw material in electric arc furnace smelting .
Its hardness between corundum and diamond , the mechanical strength is higher than corundum, brittle and sharp .
Green silicon carbide are petroleum coke and quality silica as the main raw material, add salt as an additive in electric arc furnace smelting .
Its hardness between corundum and diamond , the mechanical strength is higher than corundum .
There are commonly two different silicon carbide abrasive crystals , one is green silicon carbide, with SiC 97% above, the main tool used for grinding hard gold .
Another black silicon carbide , metallic luster, containing SiC 95% more strength than the large green silicon carbide , but the hardness is low, primarily used for grinding cast iron and non-metallic materials .