Federal-mogul Burscheid Gmbh

Waldemar Urbatzka

Peter-Klaus Esser

Christian Herbst-Dederichs

Stefan Duerdoth

Stefan Dürdoth

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 &#x3bc;m, a nitride connecting layer with a layer thickness of from 0.5-15 &#x3bc;m on the nitride diffusion layer, and an oxide layer with a layer thickness of from 0.05-3 &#x3bc;m 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.

Growing community of inventors

Burscheid, Germany

Waldemar Urbatzka