Silicon carbide is divided into black silicon carbide and green silicon carbide, both of which belong to α-SiC. Green silicon carbide is the same as black silicon carbide, that is, raw materials and production processes are different, green silicon carbide is green translucent, hardness, purity is better than black silicon carbide.
1. Black silicon carbide contains about 98.5% SiC, its toughness is higher than that of green silicon carbide, and most of them are used in the production of products with low tensile strength, such as glass, ceramics, stone, refractories, cast iron and non-ferrous metals.
2. Green silicon carbide contains more than 99% SiC, good self-sharpening, and is mostly used in the production of cemented carbide, titanium alloy and optical glass and other products.
3. Chemical coefficient of green silicon carbide: green silicon carbide has stable chemical properties, high thermal conductivity, low thermal expansion coefficient, good wear resistance, in addition to abrasive use, it can also be used to manufacture high-grade refractory materials, light weight and high strength, good energy-saving effect.
Green silicon carbide is suitable for grinding hard alloys, metals and hard and brittle non-metallic materials such as copper, brass, aluminum, gemstones, optical glass, ceramics, etc. Green silicon carbide can also be used in ceramic materials. Due to the high purity of black silicon carbide, it can be used in the production of refractories and various abrasives.
Black silicon carbide is made of quartz sand, petroleum coke and high-quality silica as the main raw materials, which are smelted at high temperature. Its hardness is between corundum and diamond, its mechanical strength is higher than corundum, and it is brittle and sharp.