Why is silicon carbide powder black and green

 Black silicon carbide is made of quartz sand, petroleum coke and high-quality silica as the main raw materials, and is smelted at high temperature in a resistance furnace. The raw materials used in the manufacture of green silicon carbide, such as black silicon carbide, are roughly the same, and industrial salt is added as a reactant and accelerator to react in a resistance furnace. In terms of its color, it is green, so it is named green silicon carbide. In addition to the difference in color, in general, green silicon has good sharpness and black silicon has good toughness. It is different from where they are used. The texture of green silicon carbide is purer than black silicon carbide, and the hardness is higher than that of black silicon carbide. Its grinding purpose is the same as that of black silicon carbide. It is more suitable for fine grinding of materials such as thread grinding, grinding tools, etc. Grinding materials are more widely used for workpieces of cemented carbide and diamond products. To provide you with (ferroalloy spot network) black silicon carbide is made of quartz sand, petroleum coke and high-quality silica as the main raw materials, smelted at high temperature in a resistance furnace. The raw materials used in the manufacture of green silicon carbide, such as black silicon carbide, are roughly the same, and industrial salt is added as a reactant and accelerator to react in a resistance furnace. In terms of its color, it is green, so it is named green silicon carbide. How about black and green? In addition to the difference in color, in general, black silicon has good toughness. Why is silicon carbide different from where they are used. The texture of green silicon carbide is purer than black silicon carbide, and the hardness is higher than that of black silicon carbide. Its grinding purpose is the same as that of black silicon carbide. It is more suitable for fine grinding of materials such as thread grinding, grinding tools, etc. Grinding materials are more widely used for workpieces of cemented carbide and diamond products.

Why does industrial silicon carbide appear black or green? There is a view that the reason why silicon carbide appears black is that the crystals are wrapped in fine carbon particles. When salt is not added, because the silicon dioxide evaporates quickly, the carbonaceous material has no time to react with it, causing a part of the silicon dioxide vapor to escape, but the carbonaceous material does not completely occur, leaving fine particles in the existing The generated silicon carbide crystals. In the process of producing green silicon carbide, we often say that salt is added more than black silicon carbide smelting, because salt can promote the greenness of silicon carbide products. However, after a large number of long-term experiments, some manufacturers have found that in the process of smelting green silicon carbide, when there are more impurities (aluminum, calcium, magnesium, boron, etc.) in the raw materials, pure green silicon carbide cannot be smelted. On the contrary, if the purity of the raw materials is too high, bright green silicon carbide can be smelted without adding salt. Sometimes when smelting green silicon carbide and adding salt, there are some side effects that increase the leakage of the charge and furnace body, and aggravate the corrosion of equipment and workshops. Therefore, in the process of smelting silicon carbide, more attention needs to be paid to the use of table salt.

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