Abrasive production process
Since the 1970s, there have been mass-produced man-made abrasives, of which the most important are silicon carbide and alumina. Silicon carbide commonly known as emery, the pure silica sand and coke mixed with a small amount of wood chips, into the electric furnace, in the 2,200 ~ 2,480 ℃ roasting about 36 hours and obtained. Alumina commonly known as corundum, commonly used in industrial arc furnace melting aluminum bauxite, white transparent transparent metal used as abrasive, black for processing castings and steel. Artificial diamond grinding wheel is the highest hardness of the abrasive, carbide grinding tool for the necessary. Artificial diamonds can also be made into various shapes and sizes of tools to apply to cutting glass and ceramics. Boron carbide hardness is higher than silicon carbide, not suitable for the production of grinding wheel, polished hard material can be used to replace expensive diamond. Cubic boron carbide is twice the hardness of silicon carbide, alumina 2.5 times, with it grinding some tool steel is very effective.