There are many tungsten carbide cutting tools coating preparation methods, vapor deposition is the main method of preparing tungsten carbide cutting tools coating which divided into vapor deposition comprises physical vapor deposition (PVD) and chemical vapor deposition (CVD). Compared with the CVD coating technology, PVD coating technology has the following advantages:
1. PVD coating depositing a low temperature, can be 200 ~ 600 ℃ and other superhard TiN coating deposition below, it will not reduce the bending strength of the original base material, between the coating and the substrate does not produce η phase, so no special carbide material, expanding the range of applications;
2. PVD coating has a fine structure, the internal compressive stress in the coating, anti-crack growth;
3.PVD coating can coate the surface smoothly, more effective than the CVD coating to prevent cross crack rake face, but also can reduce the friction coefficient;
4.Useing the sharp edge of the tool as a matrix which is very important for high-speed cutting.
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