Patent US3867140A successfully refreshed from Google Patents.
Patent US4223075A successfully refreshed from Google Patents.
US4223075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Graphite fiber, metal matrix composite
Assignee: Aerospace Corp
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Filing: 1977-01-21
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Granted: 1980-09-16
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Expires: 1997-01-21
Abstract
Abstract Metals constituting the matrix of carbon (graphite) filament reinforced composites are alloyed with titanium and boron to prevent or reduce the migration of the titanium-boron coating applied to the filaments prior to their impregnation with the metal matrix materials.
Inventors
- 👤 William C. Harrigan, Jr.
- 👤 Robert H. Flowers
- 👤 Silas P. Hudson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:18
CPC Classifications
C; C22; C22C; C22C47/00; C22C47/02; C22C47/04; C22C49/00; C22C49/14; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12458; Y10T428/12486; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/12625
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
101 words
A graphite filament reinforced metal matrix composite comprising: (a) at least one multi-strand graphite filament having an initial coating of titanium-boron on the surfaces thereof; and, (b) a solid metal matrix having the graphite filament embedded therein and adhered thereto, the metal of said matrix being selected from the group consisting of aluminum, copper, tin lead, silver, zinc, magnesium, and alloys thereof, said metal containing alloying elements of titanium and boron in amounts effective to minimize the net absorption of the initial titanium-boron coating by the metal matrix when said matrix is heated to a temperature approaching the liquidus, or higher.
Claim 2
Dependent Claim
101 words
A graphite filament reinforced metal matrix composite comprising: (a) at least one multi-strand graphite filament having an initial coating of titanium-boron on the surfaces thereof; and, (b) a solid metal matrix having the graphite filament embedded therein and adhered thereto, the metal of said matrix being selected from the group consisting of aluminum, copper, tin lead, silver, zinc, magnesium, and alloys thereof, said metal containing alloying elements of titanium and boron in amounts effective to minimize the net absorption of the initial titanium-boron coating by the metal matrix when said matrix is heated to a temperature approaching the liquidus, or higher.
Claim 3
Dependent Claim
36 words
A composite as defined in claim 1, wherein said metal comprises aluminum, or an alloy thereof, and the titanium and boron therein are in the approximate proportions of up to 0.25 and 0.025 weight percent, respectively.
Claim 4
Dependent Claim
36 words
A composite as defined in claim 1, wherein said metal comprises tin, or an alloy thereof, and the titanium and boron therein are in the approximate proportions of up to 0.25 and 0.025 weight percent, respectively.
Claim 5
Dependent Claim
32 words
A composite as defined in claim 1, wherein said metal comprises copper, and the titanium and boron therein, are in the approximate proportions of up to 1.0 and .05 weight percent, respectively.
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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |