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, but the raw materials and production processes are different. Green silicon carbide is a green translucent body, and its hardness and purity are better than black silicon carbide.
1. Black silicon carbide contains about 98.5% silicon carbide, and its toughness is higher than that of green silicon carbide. It is mostly used to produce products with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals.
2. Black silicon carbide is made of quartz sand, petroleum coke and high-quality silica as the main raw materials, and is smelted at high temperature. Its hardness is between corundum and diamond, its mechanical strength is higher than corundum, and it is brittle and sharp.
3. Green silicon carbide contains more than 99% silicon carbide and has good self-sharpening properties. It is mostly used in the production of cemented carbide, titanium alloy and optical glass.
4. Chemical coefficient of green silicon carbide: Green silicon carbide has stable chemical properties, high thermal conductivity, low thermal expansion coefficient and good wear resistance. In addition to being used as abrasive, it can also be used to manufacture advanced refractory materials. It is light in weight and high in strength. The energy saving effect is good.
5. Green silicon carbide is suitable for grinding copper, brass, aluminum, precious stones, optical glass, ceramics and other hard alloys, metals and hard and brittle non-metallic materials. Green silicon carbide can also be used for ceramic materials. Due to the high purity of black silicon carbide, it can be used to produce refractory materials and various abrasive tools.
