Patent ID: 7851075

Claim:
Work piece coated with a system of film layers comprising at least one film composed of (Al y Cr 1-y )X, where X═N, C, B, CN, BN, CBN, NO, CO, BO, CNO, BNO or CBNO and 0.415≦y≦0.695, with the composition within said (Al y Cr 1-y )X film varying over the thickness of the (Al y Cr 1-y )X film continually or in steps, said (Al y Cr 1-y )X film having a cubic crystal structure and a rate of wear less than or equal to 1.5×10 −15 m 3 m −1 N −1 , said work piece constituting one of the following tools: a milling tool, a clearing tool, an (indexable tip) insert for turning and milling.