Cemented carbide indexable inserts are the most widespread tools for machining of metal alloys. In order to improve the wear resistance of the tools, the indexable inserts are coated with wear resistant thin films. Depending on the coating type and application, the thin films are produced by chemical vapor deposition (CVD) or physical vapor deposition (PVD). For metal turning cutting applications, multilayer coatings made by CVD are state-of-art.

The multilayer sequence of the coating aims to provide wear, corrosion, and heat resistance. In general, titanium carbonitride (Ti(C,N)) enhances the wear resistance, due to the intrinsic properties. As a result of ever increasing cutting speeds, high temperatures at the interface tool–chip material are reached. By reason of the low thermal conductivity of aluminum oxide (Al2O3), thin layers of alumina are used as thermal barriers to protect the cemented carbide substrates from the high temperatures at the cutting edge.

A typical coating for high speed metal cutting consists of a multilayer of titanium nitride (TiN), Ti(C,N), and Al2O3 layers. The adhesion between the Al2O3 and the Ti(C,N) layer is always a critical point in coatings for metal cutting applications. Lack of adhesion between this layers reduces considerably the wear resistance of the tool.

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