Methods for surface treating engine valves and engine valves treated thereby
US7225781B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 18, 2006 |
| Grant date | Jun 5, 2007 |
| Priority date | — |
| Expiry date | Jan 18, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49298
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention teaches a method for surface treating an engine valve made from titanium or titanium alloy in order to form a hardened coating having a high level of adhesion to the surface of the engine valve, and also having improved abrasion and impact resistances. The method includes a hardening treatment process for forming a hardened layer on the surface of the engine valve by providing oxygen dissolved into the surface of the engine valve as a solid solution; and a coating treatment process applied after the hardening treatment process. The coating treatment process forms a coating on the surface of the engine valve by physical vapor deposition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.