Production Process Of Abrasives

Since the 1970s, a large number of artificial abrasives have been produced, with the most important being silicon carbide and alumina. Silicon carbide, commonly known as diamond sand, is made by mixing pure silica sand with coke and adding a small amount of wood chips, then placing them in an electric furnace and roasting them at 2200-2480 ℃ for about 36 hours. Aluminum oxide, commonly known as corundum, is commonly used in industry to heat and melt aluminum bauxite in an electric arc furnace. It is used as an abrasive for heat-sensitive metals in a snow-white transparent state, while the black one is used for processing castings and steel. Artificial diamond grinding wheels are the highest hardness grinding tools and are necessary for the grinding of hard alloy cutting tools. Artificial diamonds can also be made into tools of various shapes and sizes, suitable for cutting glass and ceramics. Boron carbide has a higher hardness than silicon carbide and is not suitable for making grinding wheels. It can be used to replace expensive diamonds when polishing hard materials. The hardness of cubic boron carbide is twice that of silicon carbide and 2.5 times that of alumina, making it effective for grinding certain tool steels.