Use and characteristics of silicon carbide

Silicon carbide is a kind of carbon material in a broad sense, and its hardness is close to diamond. Silicon carbide can be used as abrasives, refractory materials, semiconductor crystals, semiconductor equipment parts, coatings and other materials.

Silicon carbide is composed of 50% carbon atoms and 50% silicon atoms, carbon atoms and silicon atoms have a lot of different combinations, silicon carbide crystal type is also as many as 200 kinds, silicon carbide can be divided into A-sic and β-SiC according to major categories.

Silicon carbide has high hardness, high temperature resistance, low density, corrosion resistance and other excellent characteristics, so it is needed in many fields, but nature only gives human "limited supply" silicon carbide.

Natural silicon carbide

Natural silicon carbide is also known as "carbonite", "moissanite", it can show a diamond-like shape, but also as difficult to mine as natural diamond - natural silicon carbide was first found in the meteorite, can be called "day foreign things", and mainly in kimberlite and other rocks were found. According to relevant information, the content of natural silicon carbide in kimberlite is 0.00004%-0.006%.

Due to the lack of natural silicon carbide, the silicon carbide currently used in industry and gemstones is mostly man-made. And compared with the movement of celestial bodies and geological changes, people based on the understanding of the material to produce silicon carbide is obviously more controllable.

Artificial silicon carbide powder

Silicon carbide powder is the basis for the manufacture of other silicon carbide materials and products, and there are many synthesis methods, including: The use of large particles of silicon carbide grinding, the use of compounds as precursor sol-gel method, the use of organic matter thermal decomposition, the use of carbon and silicon containing gas chemical vapor deposition, the use of silica powder and carbon black powder self-propagating high temperature synthesis, the use of quartz stone and coke and other solid substances for carbothermal reduction.

The purity and impurity of artificial silicon carbide powder are different, mainly black silicon carbide and green silicon carbide.