(1)WC/Co type cemented carbide This type of tungsten carbide is often referred to as unalloyed wc, cutting cast iron or carbide wear parts. Most of these alloys are composed of metallic cobalt-bonded WC particles, and metal Ni or Fe is also used as the binder material. The alloy used as the pre-cut tool grade generally has a drilling capacity of 3% -13%: the alloy used for the wear-resistant part grade can have a drilling capacity of up to 30% or more. The average size of the WC grains is typically below 10 um. Increasing the cobalt content or increasing the WC grain size reduces the hardness of the alloy, but enhances the material's ability to resist mechanical vibration. (2)WC-TIC-Co type tungsten carbide Such tungsten carbides are also called alloyed wc, cutting steel or anti-crater wear. In these grades of alloys, the drill phase is a binder phase, wC and alloyed Wc (such as WC-TiC solid solution) are the main hard phase, and also contain an additional hard phase such as tantalum carbide. The solubility of WC in titanium carbide is very large, and the solid solution formed by dissolving in titanium carbide is almost ideal TiC character, maintaining the high hardness and high wear resistance inherent in titanium carbide. The basic composition of these grades is 3% to 12% drill, 60% 85% WC, 4% to 25% titanium carbide and up to 25% tantalum carbide. Among them, WC-TiC-TaC(NbC)-Co, wc-TaC(NbC)-Co, TiC-WC-TaC(Nbe)-Mo-N, etc. are characterized by high hardness and good tamper resistance. Especially the red hardness is good. (3) Special tungsten carbide