In addition to carbon atoms, nitrogen atoms and boron atoms can also enter the gaps of the metal lattice to form interstitial solid solutions. They have similar properties to interstitial carbides, with electrical conductivity, thermal conductivity, high melting point, high hardness, and high brittleness.
The matrix of cemented carbide consists of two parts: one part is the hardening phase; the other part is the bonding metal.
Carbide tool
Carbide tool
The hardened phase is the carbide of transition metals in the periodic table, such as tungsten carbide, titanium carbide, and tantalum carbide. In addition, nitrides, borides, and silicides of transition metals have similar properties and can also act as hardening phases in cemented carbide. The existence of the hardened phase determines the alloy's extremely high hardness and wear resistance.
The requirements of cemented carbide for WC grain size of tungsten carbide According to the different uses of cemented carbide, different grain sizes of WC (tungsten carbide) are used. Cemented carbide cutting tools: For example, the cutting machine blade, V-CUT knife and other finishing alloys use ultra-fine, sub-fine, and fine-grained WC, and the roughing alloys use medium-grain WC. Gravity cutting and heavy-duty cutting alloys use medium and coarse Granular WC as raw material; mining tools: high rock hardness, large impact load, coarse-grained WC, small rock impact, small impact load, medium-grained WC as raw material; wear-resistant parts: when emphasizing its wear resistance, compression resistance and surface finish When using ultra-fine, sub-fine, fine, and medium-grain WC as raw materials, impact-resistant tools mainly use medium and coarse-grained WC raw materials.