Thermal Treatment Method
US7208055B2 · kind B2 · utility
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3References
6Claims
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Assignee
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Key dates
| Filing date | Jul 14, 2003 |
| Grant date | Apr 24, 2007 |
| Priority date | — |
| Expiry date | Jul 14, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C8/12
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An article of titanium or a titanium-based alloy, or of zirconium or a zirconium-based alloy is case hardened by heat treatment for at least 12 hours at one or more temperatures in the range of 850° C. to 900° C. and at a pressure in the order of atmospheric pressure in an oxygen diffusion atmosphere. The oxygen diffusion atmosphere comprises a carrier gas such as argon which does not react chemically with the article the said temperature range and molecular oxygen. The concentration of oxygen as the oxygen diffusion atmosphere is in the range of 10 volumes per million to 400 volumes per million.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.