The industry generally refers to materials with a Vickers hardness HV of 10~40GPa as high-hard materials, generally represented by metal-based or ceramic-based composite materials, such as cemented carbide, silicon carbide, corundum (alumina), etc.; Vickers hardness HV Those larger than 40GPa are called superhard materials, which mainly refer to diamond and cubic boron nitride. Challenging and severe working conditions require materials to meet the conditions of high hardness and wear resistance, as well as harsh requirements such as ultra-high temperature, high strength, impact resistance, high transmission, and large torque.