High temperature gaseous oxidation for passivation of austenitic alloys
US6758917B2 · kind B2 · utility
12Cited by
4References
21Claims
0Family size
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Key dates
| Filing date | Nov 18, 2002 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Nov 18, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for forming a chromium-rich layer on the surface of a nickel alloy workpiece containing chromium includes heating the workpiece to a stable temperature of about 1100° C., and then exposing the workpiece to a gaseous mixture containing water vapor and one or more non-oxidizing gases for a short period of time. The process conditions are compatible with high temperature annealing and can be performed simultaneously with, or in conjunction with, high temperature annealing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.