Nonferrous piston ring with hard surface treatment layer
US5316321A · kind A · utility
30Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 2, 1992 |
| Grant date | May 31, 1994 |
| Priority date | — |
| Expiry date | Jul 2, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/94
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A piston ring is made of a titanium alloy, at least an outer peripheral surface and upper and lower surfaces thereof are formed with a nitrogen diffused layer, and at least an outer peripheral sliding surface thereof is coated with a hard film by physical vapor deposition on the nitrogen diffused layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.