Sliding element, in particular a piston ring, having a coating

US9488276B2 · kind B2 · utility

Assignee

• Federal-Mogul Burscheid GmbH · DE

Inventors

• Marcus Kennedy · Düsseldorf, DE
• Ralf Lammers · Wermelskirchen, DE
• Yuriy Ivanov · Bensberg, DE
• Michael Zinnabold · Burscheid, DE

Key dates

• Filing date: Oct 31, 2013
• Grant date: Nov 8, 2016
• Expiry date: Oct 31, 2033

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16J9/26
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The present application relates to a sliding element, in particular a piston ring, having at least one sliding surface which has a coating which has, from the inside outwards, a metal-containing bonding layer and a DLC layer, where the DLC layer is an amorphous hydrogen-free diamond-like carbon layer which has a DLC main layer which extends from the bonding layer to an adjoining DLC covering layer and has a carbon content of more than about 98.5 at %, oxygen and/or hydrogen and/or nitrogen in a proportion of in each case less than about 0.5 at % and an sp2/sp3 ratio of the carbon in the range from about 1 to about 3, and a DLC covering layer which extends from the DLC main layer to the surface of the sliding element and has a lower carbon content and/or higher oxygen content and/or higher hydrogen content compared to the main layer and also metals and/or metal oxides and an sp2/sp3 ratio of the carbon in the range from about 1 to about 3.