Patent ID: 8491989

Claim:
A coating system, comprising at least one layer of type A, the layer of type A consisting essentially of (Al y Cr 1-y )X, wherein X depicts one of the group consisting of N, CN, BN, NO, CNO, CBN, BNO and CNBO, y describing a stoichiometric composition of a metallic phase fraction; and at least one layer of type B, the layer of type B consisting essentially of (Al u Cr 1-u-v-w Si v Me w )X, wherein X depicts one of the group consisting of N, CN, BN, NO, CNO, CBN, BNO and CNBO, and wherein Me depicts one of the group consisting of W, Nb, Mo and Ta or a mixture of two or more of the constituents of that group, u, v and w describing a stoichiometric composition of a metallic phase fraction; wherein a thickness ratio of said layer of type A to said layer of type B is higher than 1, and wherein 0<y, u, w, v<1.