Strength and fracture toughness was not satisfactory

The choice of tool materials turning and milling, carbide tool material used. When cutting difficult materials at high cutting temperatures, carbide often seem stiff enough, had to reduce the cutting speed to lower productivity for processing. CBN and ceramic materials, high temperature performance than carbide, but the strength and  Diamond blade toughness was not satisfied. CBN expensive, application is limited. In recent years, with advances in manufacturing technology, ceramic material  Abrasive grinding wheel fracture toughness has been considerable improvement in the level, but the price is not expensive, so applications are continuously expanding. Currently used machining ceramic materials are aluminum oxide and silicon nitride.