Green silicon carbideIt is made of petroleum coke and high-quality silica as the main raw materials, adding salt as an additive, and smelting at high temperature through a resistance furnace, and the crystals smelted into it have high purity and hardness, and its hardness is between corundum and diamond, and its mechanical strength is higher than corundum. So what are the production processes and uses of green silicon carbide?
Green silicon carbide production process:
Green silicon carbide manufacturing method is the same as black silicon carbide, but the purity of the raw materials used is higher, but also formed at a high temperature of about 2200 °C in the resistance furnace, green, translucent, hexagonal crystalline, its Sic content is higher than black, physical properties are similar to black silicon carbide, but the performance is slightly more brittle than black, and also has better thermal conductivity and semiconductor characteristics.
Industrial green silicon carbide varies with its purity depending on the type and content of impurities it contains. The crystal structure is divided into hexagonal or rhombohedral α-SiC and cubic β-SiC.
More than 70 different variants of α-SiC have been found due to the different stacking sequences of carbon and silicon atoms in their crystal structure. β-SiC is converted to α-SiC above 2100 °C, and the industrial production method of green silicon carbide is to use high-quality quartz sand and petroleum coke in a resistance furnace. The refined green silicon carbide blocks are crushed, acid and alkali washed, magnetic separation and screening or water separation to make products of various particle sizes.
Specific uses of green silicon carbide:
1. As an abrasive, it can be used to make abrasives, such as grinding wheels, oil stones, grinding heads, sand tiles, etc.
2. As a metallurgical deoxidizer and high-temperature resistant material.
3. High-purity single crystal, which can be used to manufacture semiconductors and silicon carbide fibers.
4. Mainly used in crystal grinding, single crystal silicon wire cutting, ceramic polishing, and precision grinding wheel manufacturing, plastic products filling modification and many other fields.
5. It can be used for crystal cutting and precision grinding, hard glass precision grinding, single crystal silicon and polycrystalline silicon rod slicing, single crystal silicon wafer precision grinding, superhard metal processing, copper and copper alloy and other soft metal processing, a variety of resin materials processing, etc.
6. It is an ideal material for super refined oil stone. It has good thermal conductivity and high temperature resistance.
