CVD Coating

CVD (Chemical Vapor Deposition) coating means making 4-8 μm film on the material at 800-1000℃ atmosphere.

Cemented carbide can increase a wear resistance peculiarity with CVD coating, but decreases TRS.

Stratum becomes thicker, TRS becomes lower.

And also the grain size becomes finer, TRS become lower.

It is necessary to consider above points when making up tools idea.

Surface of CVD coating is hard to polish, and it is said, in general, that CVD coating surface roughness is inferior to that of cemented carbide.