SLIDING ELEMENT FOR USE IN INTERNAL COMBUSTION ENGINE

摘要

A sliding element for use in an internal combustion engine may include a ferrous base having a peripheral sliding surface covered by a protective surface layer, the protective surface layer including at least one nitride applied via at least one of physical vapour deposition and a nitrided layer. The peripheral sliding surface may have a diamond like carbon (DLC) coating disposed thereon. The coating may include at least one of (a) one or more transition layers composed of WC1-x and (b) an adhesive layer of metallic chromium with a crystal structure. The coating may include an intermediate layer of metal DLC, the metal may be tungsten in a multilayer structure of a-C:H:W and a-C:H, and an outer layer of metal-free DLC.

主权项

1. A sliding element for use in an internal combustion engine, comprising: a ferrous base having a peripheral sliding surface covered by a protective surface layer including at least one nitride applied via at least one of physical vapour deposition and a nitrided layer, the peripheral sliding surface having a diamond like carbon (DLC) coating disposed thereon, wherein:
(i) the coating includes at least one of (a) one or more transition layers composed of WC1-x and (b) an adhesive layer of metallic chromium with a crystal structure, an intermediate layer of metal DLC, wherein the metal is tungsten in a multilayer structure of a-C:H:W and a-C:H, and an outer layer of metal-free DLC; and (ii) wherein at least one of a ratio between a thickness of the outer layer and the intermediate layer is greater than 4 and a thickness ratio of the total layers of the coating by a thickness of the outer layer is greater than 1.