Properties of Cemented Carbide Materials

Cemented carbide is a kind of carbide (WC, TiC) micron powder with high hardness and refractory metal. Powder metallurgical products of cemented carbide tools are sintered in vacuum furnace or hydrogen reduction furnace with cobalt (Co) or nickel (Ni) and molybdenum (Mo) as binders.

Carbides, nitrides and borides of IVB, V B and VI B metals are collectively called cemented carbides because of their high hardness and melting point. The structure, characteristics and application of hard gold are described below with emphasis on carbides.

In metal-type carbides formed by IVB, V B, VI B metals and carbon, because of the small radius of carbon atoms, they can be filled in the voids of metal lattices and retain the original lattice form of metal, forming interstitial solid solutions. Under appropriate conditions, the solid solution can continue to dissolve its constituent elements until it reaches saturation. Therefore, their composition can be changed within a certain range (for example, the composition of titanium carbide varies between TiC 0.5 and TiC), and the chemical formula does not conform to the valence rule. When the dissolved carbon content exceeds a certain limit (e.g. Ti:C=1:1 in titanium carbide), the lattice pattern will change and the original metal lattice will be transformed into another form of metal lattice. At this time, the mesenchymal solid solution is called a mesenchymal compound.