Patent ID: 8088501

Claim:
Hard coating layer system comprising at least a main layer ( 3 ) on a surface of a substrate ( 1 ), a buried layer ( 4 ) and an outer surface layer ( 5 ), wherein a. the surface layer ( 5 ) comprises AlCrZ with Z standing for N, C, B, CN, BN, CBN, NO, CO, BO, CNO, BNO, or CBNO, and b. the buried layer ( 4 ) comprises a nitride, carbide, carbonitride, silicon nitride, silicon carbide or silicon carbonitride of a transition metal or of a combination of transition metals from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W, and c. the main layer ( 3 ) comprises nitride, carbide or carbonitride of a transition metal or of a combination of transition metals from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W and at least one element from Al, Si, B or O, and d. the surface layer ( 5 ) having a thickness t 1 of 0.2 μm<t 1 <0.5 μm.