Green silicon carbide is made of petroleum coke and high-quality silica as the main raw materials, adding salt as an additive, and smelted at high temperature in a resistance furnace. The smelted crystal has high purity and high hardness. Its hardness is between corundum and diamond, and its mechanical strength is high. higher than corundum. So what are the production processes and uses of green silicon carbide?
The production process of green silicon carbide:
The manufacturing method of green silicon carbide is the same as that of black silicon carbide, but the purity of raw materials used is higher. It is also formed at a high temperature of about 2200°C in a resistance furnace. It is green, translucent, hexagonal, and its Sic content is higher than that of black. , The physical properties are similar to black silicon carbide, but the performance is slightly more brittle than black, and it also has better thermal conductivity and semiconductor properties.
Due to the different types and contents of impurities contained in industrial green silicon carbide, the transparency varies with its purity. The crystal structure is divided into hexagonal or rhombohedral α-SiC and cubic β-SiC.
α-SiC has many different variants due to the different stacking sequences of carbon and silicon atoms in its crystal structure, and more than 70 species have been discovered. β-SiC transforms into α-SiC above 2100°C, and the industrial production method of green silicon carbide is refining in a resistance furnace with high-quality quartz sand and petroleum coke. The smelted green silicon carbide blocks are made into products of various particle sizes through crushing, acid-base washing, magnetic separation and sieving or water separation.
Specific uses of green silicon carbide:
1. As an abrasive, it can be used to make abrasive tools, such as grinding wheels, oil stones, grinding heads, sand tiles, etc.
2. As metallurgical deoxidizer and high temperature resistant material.
3. High-purity single crystal can be used to manufacture semiconductors and silicon carbide fibers.
4. It is mainly used in many fields such as crystal grinding, single crystal silicon wire cutting, ceramic polishing, manufacturing of precision grinding wheels, filling and modification of plastic products, etc.
5. It can be used for cutting and precision grinding of crystals, precision grinding of hard glass, slicing of monocrystalline silicon and polycrystalline silicon rods, precision grinding of single crystal silicon wafers, processing of superhard metals, and slicing of soft metals such as copper and copper alloys. Processing, processing of various resin materials, etc.
6. It is an ideal material for ultra-finishing whetstone. It has good thermal conductivity and high temperature resistance.
