Patent ID: 7879443

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 the surface layer ( 5 ) comprises AlCrZ with Z standing for N, C, B, CN, BN, CBN, NO, CO, BO, CNO, BNO, or CBNO, the surface layer ( 5 ) having a thickness t 1 of 0.2 μm<t 1 < 2 μm; the buried layer ( 4 ) comprises any one of the following materials or their combinations: a metal nitride, carbide or carbonitride, a metal silicon nitride, carbide, or carbonitride, the metal being at least one transition metal of the IVB, VB or VIB group or a multilayer of the materials or a material or a combination of a multilayer of the materials comprising at least one metal or carbon; the main layer ( 3 ) comprises a nitride, carbide or carbonitride or a multilayer of nitride, carbide or carbonitride material, wherein the buried layer ( 4 ) is a diamond like carbon layer.