Tungsten Carbide Cutting Tool Coating Process Parameters Influence (B)

Tungsten carbide cutting tool coating performance largely depends on the quality of the coating process and the coating, the coating quality preparation include: coating density, texture, microstructure, structural defects, residual stress. Coating process parameters include a deposition temperature, arc current, N2 partial pressure, a negative bias, coating time, the degree of vacuum and the like.

3. Nitrogen partial pressure
Nitrogen gas as the reaction gas, the size of the partial pressure of a serious impact on the phase composition of the coating. During deposition, the nitrogen also plays a role in the arc dimension, when the gas pressure in the cavity is too low, it is difficult to maintain a stable cathodic arc, can lead to the phenomenon of breaking arc, while the film will be such that the ratio of tungsten carbide cutting tool decrease in N, reach preferably TiN, TiCN, ZrN atomic ratio.

4.The negative bias
Bias is high, the ion bombardment enhanced dense. Pulse bias to some extent reduce the residual stress dawdle, and the bonding strength increases, the friction coefficient decreases. But the bias is too high, the base overheating, mechanical properties of  tungsten carbide cutting tool the coating hardness and bonding strength will decline.


 

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