Method of producing a buildup valve for use in internal combustion engines
US5084113A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1990 |
| Grant date | Jan 28, 1992 |
| Priority date | — |
| Expiry date | Feb 26, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49314
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A buildup valve comprising a valve body of a quench-hardenable, heat resistant steel having a valve face and a buildup layer formed on the valve face from a cobalt or nickel base superalloy having higher wear and heat resistances than the heat resistant steel is useful in internal combustion engines. A hardened layer is formed in the valve face portion adjacent the buildup layer and has a maximum thickness between 0.05 mm and 2.0 mm. The buildup layer thus has a reduced thickness between 0.1 mm and 0.5 mm. The buildup valve is produced by supplying and depositing a powder of the alloy on the valve face, and applying a scanning high flux energy laser or plasma beam to the powder deposit to cause the powder to quickly melt and then quickly solidify thereby forming the buildup layer and at the same time, to cause a surface layer of the valve body underlying the powder deposit to quickly heat and then quickly cool thereby forming the hardened layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.