Patent ID: 7968182

Claim:
A cutting tool insert comprising a body 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 at least one PVD layer of an metal oxide/oxide composite where the metal atoms are selected from Ti, Nb, V, Mo, Zr, Cr, Al, Hf, Ta, Y or Si and where said oxide layer has a total thickness of between from about 0.2 to about 20 μm and is composed of two components, component A and component B, with different composition and different structure, which components are a single phase oxide of one metal element or a solid solution of two or more metal oxides, wherein said component A contains tetragonal or cubic zirconia and said component B contains crystalline or amorphous alumina, and wherein the volume contents of component A and B are from about 40 to about 95% and from about 5 to about 60% respectively.