Classification and selection principle of silicon carbide abrasive sand

For materials that need to be processed, abrasive sand is often used in the processing process, and different materials need to use different abrasive sand. For the grinding processing of silicon carbide materials, it is necessary to use silicon carbide grinding sand. However, there are also different types of silicon carbide grinding sand, and different types are suitable for different processing materials and processing environments. Therefore, the choice of the right silicon carbide abrasive sand is particularly heavySilicon carbide abrasive sand can be divided into black silicon carbide abrasive sand and green silicon carbide abrasive sand two kinds. They have certain differences in processing performance, scope of application and economy.1. Black silicon carbide abrasive sandBlack silicon carbide abrasive sand is made of raw materials such as petroleum coke, quartz and hydrochloric acid sintered at high temperature in an electric furnace. This abrasive sand has the characteristics of high hardness, high rigidity and high wear resistance. The color of black silicon carbide grinding sand is rough, so there is a certain amount of wear in the grinding process, and it will produce obvious marks in high-speed grinding. Black silicon carbide abrasive sand is suitable for processing hard, brittle materials, such as glass, ceramics and so on.2. Green silicon carbide abrasive sandGreen silicon carbide grinding sand is made of sand, petroleum coke, caustic soda and hydrochloric acid and other materials sintered in an electric furnace. It has the characteristics of high hardness, high wear resistance and high chemical stability, so it will not lead to the pollution of the surface of the processing material, and is the ideal grinding sand for processing precision parts at present. The surface of green silicon carbide abrasive sand is relatively smooth, and the wear amount is relatively small. It is suitable for processing with high requirements on the finish and precision of the material surface, such as semiconductors, optical lenses and so on.When choosing silicon carbide abrasive sand, the following aspects need to be considered:1. The hardness and strength of the processed materialDifferent hardness and strength of materials need to choose different abrasive sand. For hard, brittle materials, such as glass, ceramics, etc., you need to choose black silicon carbide abrasive sand. And for materials with relatively high strength and high surface finish requirements, such as semiconductors, optical lenses, etc., green silicon carbide abrasive sand needs to be selected.2. Speed and pressure of grinding machineDifferent silicon carbide grinding sands are suitable for different grinding machine speeds and pressures. In general, black silicon carbide grinding sand is suitable for high speed and high pressure grinding process, while green silicon carbide grinding sand is suitable for low speed, low pressure grinding process.3. Requirements of the processing environmentDuring the grinding process, some processing environments have harsh requirements for abrasive sand, such as processing that is more sensitive to the pollution of the surface of the material, then it is necessary to choose abrasive sand with good chemical stability and is not easy to oxidize. At this time, green silicon carbide grinding sand is a better choice.4 EconomyAlthough green silicon carbide abrasive sand has better processing results than black silicon carbide abrasive sand, it is also much more expensive in price. Therefore, it is necessary to weigh the processing effect and economic cost when processing materials, and choose the appropriate silicon carbide grinding sand.