US3640778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating of titanium alloys
Assignee: RTX Corp
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Filing: 1969-03-27
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Granted: 1972-02-08
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Expires: 1989-03-27
Abstract
Abstract Titanium and its alloys are provided with a chemically bonded coating derived from a reaction at high temperature of certain aluminum-pigmented silicone resins with the titanium substrate to form in situ by decomposition a quasi-organic complex coating which not only provides improved oxidation and corrosion resistance together with improved physical properties associated with surface-oriented characteristics, such as fatigue and creep stability, but which extends the useful operating range of a number of these alloys to temperatures of 650*-900* F. or higher.
Inventors
- 👤 Jules P Winfree
- 👤 Herbert E Todd
- 👤 Charles C Mccomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:02
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; B05D2202/00; B05D2202/30; B05D2202/35; B05D3/00; B05D3/04; B05D3/0486; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
The method according to claim 1 wherein: the final heat treatment is conducted at a temperature of about 650*-950* F.
Claim 2
Dependent Claim
23 words
The method according to claim 2 wherein: the final heat treatment is conducted in an inert atmosphere containing about 10-40 volume percent oxygen.
Claim 3
Dependent Claim
23 words
The method according to claim 2 wherein: the final heat treatment is conducted in a nitrogen atmosphere containing about 10-40 volume percent oxygen.
Claim 4
Dependent Claim
18 words
The method according to claim 4 wherein: the weight ratio of dimethyl siloxane to aluminum is about 2.
Claim 5
Dependent Claim
17 words
The method according to claim 4 wherein: curing is effected at a temperature of about 450*-550* F.
Claim 6
Independent Claim
109 words
The method of coating the high-strength titanium alloys which comprises: cleaning and deoxidizing the surface to be protected; within about 1 hour, coating the surface to a thickness of about 0.0005- 0.004 inch with a pigmented silicone resin mixture consisting essentially of a nonreactive dimethyl siloxane and aluminum pigment in a weight ratio of about 2, and sufficient inert dispersant to permit convenient application; within about 8 hours, curing the coating in an uncontaminated air atmosphere at 450*-550* F. for at least 15 minutes; and heat treating the coating for about 1-8 hours at a temperature of 650*-950* F. in an inert atmosphere containing about 10-40 volume percent oxygen.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |