Piston ring

US8641046B2 · kind B2 · utility

Assignee

• Federal-Mogul Burscheid GmbH · DE

Inventors

• Steffen Hoppe · Overath, DE
• Manfred Fischer · Leichlingen, DE

Key dates

• Filing date: Mar 18, 2009
• Grant date: Feb 4, 2014
• Expiry date: Jul 3, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31678
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A piston ring with a DLC coating comprises an adhesive layer on a base material from inside to outside, an amorphous metallic hydrocarbon layer and an amorphous non-metallic hydrocarbon layer, wherein primarily sp2 bonds predominate in the metallic hydrocarbon layer and the non-metallic hydrocarbon layer comprises sp2 and sp3 bonds, the sp3 bond fraction being higher than in the metallic hydrocarbon layer so that an electrical resistance of the DLC coating arises, said resistance being in the range greater than 5000 ohms, in particular greater than 5000 kohms.