A coated carbide body cutting tool

摘要

The present invention relates to CVD-coated cemented carbide tools used for chip forming machining. More particularly, it relates to a coating consisting of an initial layer of MetCxN1-x adjacent to the substrate, followed by an intermediate layer of MetCxOyNz, which is further followed by a wear resistant layer of MetCxN1-x, where the metal Met is selected from Ti,Zr,Hf,V,Nb and Ta. The intermediate layer acts as a diffusion barrier thus influencing the coating structure and coating adhesion of the following layer.