Kennametal Inc.
Low stress hard coatings and applications thereof

Abstract:

In one aspect, coated cutting tools are described herein comprising a substrate and a coating comprising a refractory layer deposited by physical vapor deposition adhered to the substrate, the refractory layer comprising M.sub.1-xAl.sub.xN wherein x.gtoreq.0.68 and M is titanium, chromium or zirconium, the refractory layer including a cubic crystalline phase and having hardness of at least 25 GPa.