US4908072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In-process formation of hard surface layer on Ti/Ti alloy having high resistance
Assignee: Nippon Mining Holdings Inc
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Filing: 1988-09-08
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Granted: 1990-03-13
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Expires: 2008-09-08
Abstract
Abstract A process for producing a titanium material with excellent corrosion resistance, which comprises first applying a degree of cold working of 10% or more of the total working reduction while causing an oil to exist on the surface of the titanium material during cold working thereof and then subjecting the titanium material to in-situ heat treatment at a temperature of 300 DEG C. or higher, thereby forming a layer with excellent corrosion resistance containing at least one of Ti2N, TiC and Ti(CN) on the titanium material surface.
Inventors
- 👤 Kazuhiro Taki
- 👤 Yasuhiro Mitsuyoshi
- 👤 Takeshi Shiraki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:33
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/02; C22; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/183
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
101 words
A process for producing a titanium material with excellent corrosion resistance, which comprises: subjecting a titanium material to cold working while causing an oil to exist on the surface of the titanium material, the degree of said cold-working being 10% or more of the total working reduction; and then subjecting the titanium material to heat treatment at 300° C. or higher temperatures to thereby react the titanium material with nitrogen and/or carbon contained in the oil to form a layer which excellent corrosion resistance containing at least one of the Ti 2 N, TiC, and Ti(CN) on the titanium material surface.
Claim 2
Dependent Claim
101 words
A process for producing a titanium material with excellent corrosion resistance, which comprises: subjecting a titanium material to cold working while causing an oil to exist on the surface of the titanium material, the degree of said cold-working being 10% or more of the total working reduction; and then subjecting the titanium material to heat treatment at 300° C. or higher temperatures to thereby react the titanium material with nitrogen and/or carbon contained in the oil to form a layer which excellent corrosion resistance containing at least one of the Ti 2 N, TiC, and Ti(CN) on the titanium material surface.
Claim 3
Dependent Claim
16 words
A process according to claim 1, wherein the titanium material comprises titanium and/or an alloy thereof.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-12 | 1993-09-11 | 1994-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-12 | 1997-09-11 | 1998-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-12 | 2001-09-11 | 2002-03-13 | $7700.00 | Window Closed / Lapsed |