Structure and characteristics
Silicon carbide is also known as carbonosilicate.Silicon carbide is made of quartz sand, petroleum coke, wood chips and other raw materials in the resistance furnace smelting at high temperature.Refined silicon carbide quickly, after crushing, acid and alkali washing, magnetic separation, screening or water separation to make a variety of particle size products.
Because of its stable chemical properties, high thermal conductivity, small expansion coefficient and good wear resistance, silicon carbide can be used in abrasive materials, advanced refractory materials, deoxidizer and the production of heating elements.In addition, the hardness of silicon carbide is very high, second only to the world's hardest diamond, with excellent thermal conductivity, is a semiconductor, high temperature can resist oxidation.
Types and applications
Silicon carbide has black silicon carbide and green silicon carbide two common basic varieties, are a-SiC.
Black silicon carbide contains about 95% SiC and its toughness is higher than that of green silicon carbide.Most used for processing low tensile strength materials, such as glass, ceramics, stone, refractory materials, cast iron and non-ferrous metals.
Green silicon carbide contains more than 97% of SiC and has good self-sharpness. It is mostly used for machining hard alloy, titanium alloy and optical glass. It is also used for honing cylinder liner and precision grinding high-speed steel tools.And then there's cubic silicon carbide.
There are more than 200 silicon carbide smelting enterprises in China, with an annual production capacity of more than 2.2 million tons (including more than 1.2 million tons of green silicon carbide and about 1 million tons of black silicon carbide).Silicon carbide processing sand powder production enterprises are mainly distributed in henan, Shandong, jiangsu, jilin, heilongjiang and other provinces.
Our country silicon carbide smelting production process, technical equipment and energy consumption per ton reached the national leading level.The quality level of black and green silicon carbide is also world-class.
According to the silicon carbide expert committee of the abrasives committee of China machine tool industry association, China's silicon carbide production capacity accounts for 84 percent of the world's total output.
The market of silicon carbide is relatively stable and the market supply and sales are stable.