Piston ring with chromium nitride coating for internal combustion engines
US7891669B2 · kind B2 · utility
29Cited by
10References
8Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jun 16, 2007 |
| Grant date | Feb 22, 2011 |
| Priority date | — |
| Expiry date | Sep 19, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
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:
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.