Patent ID: 7033682
Filing Date: 2006-04-25
Classification: C23C

Abstract:
1. A coated machine tool comprising a multilayer wear resistant coating applied to a base material of said machine tool, said coating comprising a relatively hard underlayer and a chemically inert rare earth oxide overlayer, wherein: said relatively hard underlayer is formed over said base material of said machine tool and comprises at least two layers; one of said layers of said underlayer comprises a metal and is formed over said base material; another of said layers of said underlayer comprises a metal nitride, metal carbide, or metal carbo-nitride and is formed over said metal layer; said rare earth oxide overlayer is formed over said underlayer and said overlayer constitutes the outermost layer of the coated machine tool; and said rare earth oxide overlayer comprises a rare earth oxide that exhibits positive free energies of reaction with titanium.