The production method of green silicon carbide powder is basically the same as that of black silicon carbide, but the requirements for raw materials are different. 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.
Green silicon carbide applications:
Green silicon carbide, the grinding wheel code is GC, the grinding wheel is suitable for processing hard alloys, glass, ceramics and non-metallic materials, and is also used for semiconductor materials, high-temperature silicon carbide rod heating elements, far-infrared source substrates, etc.
Green silicon carbide production process:
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.
According to the shape, it can be divided into flat grinding wheel, beveled grinding wheel, cylindrical grinding wheel, cup grinding wheel, dish grinding wheel, etc.; according to the bonding agent, it can be divided into ceramic grinding wheel, resin grinding wheel, rubber grinding wheel, metal grinding wheel, etc. The characteristic parameters of the grinding wheel mainly include abrasive, viscosity, hardness, bond, shape, size, etc. Since the grinding wheel usually works at high speed, a rotation test (to ensure that the grinding wheel will not break at the highest operating speed) and a static balance test (to prevent vibration of the machine tool during work) should be carried out before use. After the grinding wheel has been in operation for a period of time, it should be dressed to restore the grinding performance and correct geometry.
Precautions for green silicon carbide:
The use of grinding wheels has certain risks. For everyone's safety, the precautions in use are listed below: Grinding machine is one of the most commonly used machinery and equipment in machinery factories. Whether its installation is reasonable and whether it meets the safety requirements; whether its use method is correct and whether it complies with safe operating procedures. These issues are directly related to the personal safety of every employee, so we must pay enough attention to them in actual use.
Green silicon carbide replacement process:
Wear problem any grinding wheel has its certain wear and tear requirements. When the wear condition reaches a certain level, it must be replaced with a new grinding wheel. In order to save materials, it is an extremely unsafe and illegal behavior to require the use of super wear. It is generally stipulated that when the grinding wheel is worn to a diameter 10mm larger than the diameter of the chuck, a new grinding wheel should be replaced.
Expiration date The new grinding wheel taken from the warehouse is not necessarily a qualified grinding wheel, and even the new grinding wheel purchased from the manufacturer is not necessarily a qualified grinding wheel. Any grinding wheel has a certain validity period. If it is used within the validity period, it is a qualified grinding wheel; if it is used beyond the validity period, it is not necessarily a qualified grinding wheel. The regulations stipulate that "grinding wheels should be used within the validity period, and resin and rubber bonded grinding wheels must undergo a rotation test after being stored for one year, and those who pass the test can be used."
Texture problems during use, if cracks are found in some parts of the grinding wheel, stop using it immediately and replace with a new grinding wheel to avoid accidents caused by broken grinding wheels.
