Patent ID: 8119226

Claim:
A cutting tool comprising a substrate of cemented carbide, cermet, ceramics, cubic boron nitride or high speed steel on which at least on the functioning parts of the surface thereof a thin, adherent, hard and wear resistant coating is applied wherein said coating comprises a laminated multilayer of alternating PVD or PECVD metal oxide layers, Me 1 X+Me 2 X+Me 1 X+Me 2 X . . . , where the metal atoms Me 1 and Me 2 are one or more of Ti, Nb, V, Mo, Zr, Cr, Al, Hf, Ta, Y and Si, and at least one of Me 1 X and Me 2 X is a metal oxide+metal oxide nano-composite layer composed of two components, component A and component B, with different composition and different structure which components comprise a single phase oxide of one metal element or a solid solution of two or more metal oxides, wherein the layers Me 1 X and Me 2 X are different in composition or structure or both these properties and have individual layer thicknesses larger than about 0.4 nm but smaller than about 50 nm and where said laminated multilayer has a total thickness of between about 0.2 and about 20 μm, wherein a volume content of component A is from about 40% to about 95% and a volume content of component B is from about 5% to about 60%.