Patent ID: 7226670

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 0.66≦y≦0.695, with the composition within said (Al y Cr 1-y ) X film being either essentially constant or 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 said work piece constituting one of the following tools: a milling tool, a hob, (spherical-head) ball nose mill, planar or profiling cutter, a clearing tool, reamer, (indexable tip) insert for turning and milling, a die or an injection mold.