Patent US5135782A successfully refreshed from Google Patents.
US5135782A
Expired / Lapsed
US
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Method of siliciding titanium and titanium alloys
Assignee: Rostoker Inc
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Filing: 1990-12-06
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Granted: 1992-08-04
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Expires: 2010-12-06
Abstract
Abstract Titanium and titanium alloy substrates are provided with a dense coating of a titanium silicide. The titanium silicide coating substantially increases the oxidation resistance of the substrate. The siliciding method includes the steps of: Forming a substantially molten pool of a siliciding alloy; contacting the substrate with the siliciding alloy; maintaining the substrate in contact with the siliciding alloy at a temperature at or above a minimum predetermined temperature to form a titanium silicide coating on the substrate; and separating the coated substrate from the siliciding alloy. The siliciding alloy includes a minimum effective concentration of silicon and a lithium metal flux.
Inventors
- 👤 William Rostoker
- 👤 Gareth Rostoker
- 👤 Julius J. Bonini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:43
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/18; C23C10/20; C23C10/22
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
159 words
A method of siliciding titanium and titanium base alloy substrate, said method comprising the steps of: forming a substantially molten pool of a siliciding alloy, which siliciding alloy consists essentially of at least about 60 weight percent silicon with lithium metal flux present in a predetermined proportion that renders said siliciding alloy substantially molten at a predetermined minimum siliciding temperature; contacting the titanium or titanium base alloy substrate with the siliciding alloy at a temperature that is equal to or greater than the predetermined minimum siliciding temperature; maintaining the titanium or titanium base alloy substrate in contact with the siliciding alloy, at a temperature which is equal to or greater than the predetermined minimum siliciding temperature, for a time sufficient to form a titanium silicide coating between about 5 microns and about 30 microns thick at the surface of the titanium or titanium base alloy substrate; and separating the substrate containing the titanium silicide coating from the siliciding alloy.
Claim 2
Independent Claim
159 words
A method of siliciding titanium and titanium base alloy substrate, said method comprising the steps of: forming a substantially molten pool of a siliciding alloy, which siliciding alloy consists essentially of at least about 60 weight percent silicon with lithium metal flux present in a predetermined proportion that renders said siliciding alloy substantially molten at a predetermined minimum siliciding temperature; contacting the titanium or titanium base alloy substrate with the siliciding alloy at a temperature that is equal to or greater than the predetermined minimum siliciding temperature; maintaining the titanium or titanium base alloy substrate in contact with the siliciding alloy, at a temperature which is equal to or greater than the predetermined minimum siliciding temperature, for a time sufficient to form a titanium silicide coating between about 5 microns and about 30 microns thick at the surface of the titanium or titanium base alloy substrate; and separating the substrate containing the titanium silicide coating from the siliciding alloy.
Claim 3
Dependent Claim
39 words
A method of siliciding titanium and titanium base alloy substrates in accordance with claim 1 wherein said titanium silicide coating forms as a dense layer, of substantially uniform thickness over the surface of said titanium or titanium alloy substrate.
Claim 4
Dependent Claim
21 words
A method of siliciding titanium and titanium base alloy substrates in accordance with claim 1 wherein said substrate is Ti-6A1-4V alloy.
Claim 5
Dependent Claim
21 words
A method of siliciding titanium and titanium base alloy substrates in accordance with claim 1 wherein said substrate is unalloyed titanium.
Claim 6
Dependent Claim
37 words
A method of siliciding titanium and titanium base alloy substrates in accordance with claim 1 wherein said siliciding alloy is fully molten at said temperature at which said substrate is maintained in contact with said siliciding alloy.
Claim 7
Dependent Claim
45 words
A method of siliciding titanium and titanium base alloy substrates in accordance with claim 1 wherein said titanium silicide coating improves the oxidation resistance of said titanium or titanium base alloy metal as compared to said titanium or titanium base alloy in an untreated condition.
Claim 8
Dependent Claim
28 words
A method of siliciding titanium and titanium base alloy substrates in accordance with claim 1 wherein said titanium silicide coating is harder than the underlying, unaffected substrate metal.
Claim 9
Dependent Claim
24 words
A method of siliciding titanium and titanium base alloy substrates in accordance with claim 1 wherein said minimum siliciding temperature is about 700° C.
Claim 10
Dependent Claim
27 words
A method of siliciding titanium and titanium base alloy substrates in accordance with claim 1 wherein the siliciding alloy and substrate are maintained in an inert atmosphere.
References Cited (Backward Citations)
US3085028A
Cited
FR1312819A
Cited
US3192065A
Cited
FR1388934A
Cited
US3220876A
Cited
US3397078A
Cited
US3494805A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-04 | 2004-02-03 | 2004-08-04 | $7700.00 | Window Closed / Lapsed |