Sliding element having a coating

摘要

The invention relates to a sliding element, such as a piston ring, having a coating on at least one running surface, which comprises, from the inside out, an adhesive layer (10), a metal-containing, preferably tungsten-containing, DLC layer (12), and a metal-free DLC layer (14), and is characterized in that the ratio of the thickness of the metal-free DLC layer to the thickness of the metal-containing DLC layer ranges from 0.7 to 1.5 and/or to the overall thickness of the coating ranges from 0.4 to 0.6.

主权项

1. A piston ring having at least one radially outwardly facing running surface and a coating forming said at least one running surface and extending from an inside region adjacent said running surface to a radially outward free region, said coating comprising, from the inside radially outwards, an adhesive layer, a DLC layer containing metal, and a metal-free DLC layer all having predetermined thicknesses, wherein the thickness of the metal-free DLC layer in relation to the thickness of the metal-containing DLC layer has a ratio of 0.7 to 1.5, wherein the total coating thickness is 5 μm to 40 μm, and wherein the DLC layer containing metal has a hardness of 800-1600 HV0.02.