Back to results
US 7,833,636 B2Granted
Piston ring with sulphonitriding treatment
AssigneesMahle International GmbH, Mahle Metal Leve S.A.
InventorsJuliano Avelar Araujo, Gisela Ablas Marques, Jose Valentim Lima Sarabanda
Life of this patent
Estimating the term…
Abstract
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.
Claims17
A piston ring for an internal combustion engine comprising:
- 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.
A piston ring for an internal combustion engine comprising:
- (a) a base material;
- (b) a diffusion layer formed on said base material;
- (c) a compound layer formed on said diffusion layer;
- (d) a sulfide rich compound 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.
1 more element
Dependencies are inferred from the claim text.