Patent ID: 9598763
Date: 2017-03-21
CPC Classifications: C23C,F16J

Claim:
1. A piston ring made of a carrier material of steel or a cast material, and with a wear-resistant coating made of a periodic multilayer system, with each periodicity consisting of at least two individual layers of metal nitrides, wherein adjoining layers within a periodicity have different metallic elements and that the thickness of an individual layer amounts to >15 nm, wherein at least after one or several periodicities between two adjacent periodicities at least one interlayer and no layer other than the at least one interlayer is provided, wherein the at least one interlayer is made of at least one metal from the group of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo and W, wherein adjoining individual layers within a periodicity each include at least one doping element selected from the group consisting of aluminum, silicon, and carbon; and wherein the adjoining individuals layers are not doped with the same element from the group consisting of aluminum, silicon, and carbon.