company news about Properties of silicon carbide

Silicon carbide: It is an inorganic substance with the chemical formula SiC. It is smelted at high temperature in a resistance furnace using raw materials such as quartz sand, petroleum coke (or coal coke), and wood chips (salt is required when producing green silicon carbide).

Silicon carbide has stable chemical properties, high thermal conductivity, small thermal expansion coefficient, and good wear resistance. In addition to being used as an abrasive, silicon carbide has many other uses. For example, silicon carbide powder is coated on turbine impellers or cylinder blocks using special processes. The inner wall can improve its wear resistance and extend the service life by 1 to 2 times; the advanced refractory material made of it is thermal shock resistant, small in size, light in weight, high in strength, and has good energy saving effect.

Low-grade silicon carbide (containing about 85% SiC) is an excellent deoxidizer. It can speed up steelmaking, facilitate control of chemical composition, and improve the quality of steel. In addition, silicon carbide is also widely used in the production of silicon carbide rods for electric heating elements. Silicon carbide is very hard, with a Mohs hardness of 9.5, second only to the world's hardest diamond (level 10). It has excellent thermal conductivity, is a semiconductor, and can resist oxidation at high temperatures.

Black silicon carbide: It is made of quartz sand, petroleum coke and high-quality silica as the main raw materials, and is smelted through high-temperature resistance furnace. Its hardness is between corundum and diamond, its mechanical strength is higher than corundum, and it is brittle and sharp.

Green silicon carbide: The manufacturing method is the same as that of black silicon carbide, but the raw materials used have higher purity requirements. Salt is added as an additive. It is also formed in a resistance furnace at a high temperature of about 2200°C. It is green, translucent, and has a hexagonal crystal shape. Its Sic content is higher than black, and its physical properties are similar to black silicon carbide, but its performance is slightly more brittle than black, and it also has better thermal conductivity and semiconductor properties.