Silicon carbide (SiC) is made from quartz sand, petroleum coke (or coal coke), and wood chips through high temperature smelting in a resistance furnace.
 
According to the purity of silicon carbide, it is mainly divided into black silicon carbide and green silicon carbide, and their uses are also different.
 
1. Black silicon carbide contains about 98.5% SiC, and its toughness is higher than that of green silicon carbide. It is mostly used for processing materials with low tensile strength, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals. Green silicon carbide contains more than 99% SiC and has good self-sharpening properties. 
 
2. In addition, there is a special variety in silicon carbide, which is cubic silicon carbide, which is a special kind of yellow-green crystal, which is mostly used in the finishing industry, such as the processing of bearings, with good micromachining effect. 
 
Because of its stable chemical properties, high thermal conductivity, small thermal expansion coefficient and good wear resistance, silicon carbide has many other uses besides abrasives, such as: coating silicon carbide powder on turbine impellers or cylinder blocks by a special process. The inner wall can improve its wear resistance and prolong the service life by 1 to 2 times; the high-grade refractory used to make it is resistant to shock, small in size, light in weight, high in strength, and good in energy saving effect. 
 
Silicon carbide has high hardness and excellent thermal conductivity. It is a semiconductor and can resist oxidation at high temperatures.