There are two different coating on tungsten carbide inserts. One is CVD coating, and the other one is PVD coating. Then, what is CVD coating?
CVD is chemical coating.
Turning tools with CVD coating:
The chemical coating is based on cemented carbide substrate material, and the surface of the substrate is coated with Ti (C,N), AL2O3 and other other CVD coating materials with a thickness of 3-16um. As CVD coating is with better wear resistance & heat resistance & Oxidation resistnace, the chemical stability traits than cemented carbide, so CVD coating tools have a longer life time and are suitable for high-speed processing.
Milling tools with CVD coating:
The chemical coating is based on cemented carbide substrate material, and the surface is coated with TiC, TiN, Al2O3 and other CVD coating materials with a thickness of 6-8um film by chemical coating method. Since the CVD coating has many advantages such as high hardness, heat resistance, excellent oxidation resistance, and good chemical stability traits, it has prolonging using longer life than cemented carbide tools, it is good capable of high-efficiency cutting processing.
