Mahle International Gmbh

Mahle Metal Leve S/a

Jose Valentim Lima Sarabanda

Juliano Avelar Araujo

Gisela Ablas Marques

Robert Richard Banfield

The invention relates to a piston ring for internal combustion engines, the piston ring comprises a steel or cast iron base material with a coating of chromium nitride deposited by a physical vapor deposition process on a sliding surface of the piston ring, wherein the coating is composed of a columnar crystal structure of CrN with the following features:

Piston ring with chromium nitride coating for internal combustion engines

The present invention relates to a piston ring for an internal combustion engine, the piston ring comprises a sulphide rich compound layer forming a surface layer, said sulphide rich compound layer comprising an iron nitride matrix with iron sulphide (FeS) inclusions embedded in said matrix, said sulphide rich compound layer having a sulphur content of 1 to 4 wt % S and a nitrogen content of 10 to 20 wt % N.

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Rugby, United Kingdom

Jose Valentim Lima Sarabanda