Piston ring with chromium solid particle wear-prevention layer and corrosion-resistant flank surface

US9404578B2 · kind B2 · utility

Assignee

• Federal-Mogul Burscheid GmbH · DE

Inventors

• Christian Herbst-Dederichs · Bornheim, DE
• Waldemar Urbatzka · Burscheid, DE
• Stefan Duerdoth · Burscheid, DE
• Peter Esser · Kürten, DE

Key dates

• Filing date: Dec 7, 2012
• Grant date: Aug 2, 2016
• Expiry date: Jan 28, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C25D7/04
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A coated piston ring having a base body of chromium steel with more than 10 wt.-% chromium and having an inner circumferential surface, a first flank surface, a second flank surface and an outer circumferential surface. The first flank surface comprises a nitride diffusion layer with a layer thickness of from 5-300 μm, a nitride connecting layer with a layer thickness of from 0.5-15 μm on the nitride diffusion layer, and an oxide layer with a layer thickness of from 0.05-3 μm on the nitride connecting layer. The second flank surface comprises the nitride diffusion layer, and the outer circumferential surface comprises the nitride diffusion layer and a chromium solid particle layer with 0.1-30 vol.-% solid particles, relative to the total volume of the chromium solid particle layer on the nitride diffusion layer.