US3770488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal impregnated graphite fibers and method of making same
Assignee: United States Department of the Air Force
•
Filing: 1971-04-06
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Granted: 1973-11-06
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Expires: 1991-04-06
Abstract
Abstract A technique for effecting the impregnation of graphite yarn with a metal matrix by a process which includes enhancing the wettability of the graphite yarn by initially immersing the yarn in a metal infiltrate composed of either a molten tin-titanium alloy, a molten copper-tin-titanium alloy of molten sodium. After removal from the molten infiltrate, the yarn is then immersed into a molten bath of a metal impregnate composed of either aluminum, aluminum-base alloys, magnesium, or magnesium-base alloys. The metal impregnant leaches out the metal infiltrate from the graphite yarn. This permits the metal impregnant to fill up the interstices of the yarn and coat the graphite filaments of the yarn.
Inventors
- 👤 R Pepper
- 👤 P Peninsula
- 👤 E Kendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:30
CPC Classifications
D; D02; D02G; D02G3/00; D02G3/02; D02G3/12; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/127; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/2933; Y10T428/294; Y10T428/2958; Y10T428/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
29 words
A process in accordance with claim 1 wherein said tin alloy is composed of from about 0.25 to about 10 weight percent titanium with the balance substantially all tin.
Claim 2
Dependent Claim
25 words
A process in accordance with claim 2 wherein said tin alloy is composed of about 5 weight percent titanium with the balance substantially all tin.
Claim 3
Dependent Claim
36 words
A process in accordance with claim 1 wherein said copper alloy is composed from about 0.25 to about 10 weight percent titanium, about 2 to about 30 weight percent tin with the balance substantially all copper.
Claim 4
Dependent Claim
30 words
A process in accordance with claim 4 wherein said copper alloy is composed of about 5 weight percent tin, about 2 weight percent titanium and the balance substantially all copper.
Claim 5
Dependent Claim
13 words
A process in accordance with claim 1 wherein said infiltrate is liquid sodium.
Claim 6
Dependent Claim
22 words
A process in accordance with claim 1 wherein said graphite yarn is immersed into said molten metal infiltrate within an inert atmosphere.
Claim 7
Dependent Claim
31 words
A process in accordance with claim 2 wherein said graphite yarn is immersed in said metal infiltrate at a temperature of from about 850* to about 1,000*C within an inert atmosphere.
Claim 8
Dependent Claim
31 words
A process in accordance with claim 4 wherein said graphite yarn is immersed in said metal infiltrate at a temperature of from about 850* to about 1,000*C within an inert atmosphere.
Claim 9
Dependent Claim
31 words
A process in accordance with claim 6 wherein said graphite yarn is immersed in said metal infiltrate at a temperature of from about 500* to about 700*C within an inert atmosphere.
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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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |