US4053011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reinforcing aluminum alloy
Assignee: EIDP Inc
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Filing: 1976-09-17
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Granted: 1977-10-11
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Expires: 1996-09-17
Abstract
Abstract A composite reinforced with polycrystalline alumina fibers in a matrix of an aluminum alloy containing 0.5-5.5% by weight of the matrix of lithium is prepared by infiltrating alumina fibers with a molten alloy containing aluminum and 1-8% by weight of lithium for a time sufficient to form a reaction sheath on the fibers of a thickness less than about 15% of the total fiber diameter.
Inventors
- 👤 Paul Gordon Riewald
- 👤 William Henry Krueger
- 👤 Ashok Kumar Dhingra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:42
CPC Classifications
C; C22; C22C; C22C49/00; C22C49/02; C22C49/04; C22C49/06; B; B22; B22D; B22D19/00; B22D19/02; C22C47/00; C22C47/08; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12007; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12097; Y10T428/12181; Y10T428/12486
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
A process comprising the steps of placing polycrystalline alumina fibers in a mold, forming a composite reinforced with 10-80 volume percent of said fibers and having a porosity of less than about 10% by infiltrating the fibers in the mold with a molten aluminum alloy containing about 1-8% by weight of lithium for a time sufficient to form a reaction sheath on the fibers which has a thickness of less than 15% of the total fiber diameter and cooling the composite.
Claim 2
Dependent Claim
81 words
A process comprising the steps of placing polycrystalline alumina fibers in a mold, forming a composite reinforced with 10-80 volume percent of said fibers and having a porosity of less than about 10% by infiltrating the fibers in the mold with a molten aluminum alloy containing about 1-8% by weight of lithium for a time sufficient to form a reaction sheath on the fibers which has a thickness of less than 15% of the total fiber diameter and cooling the composite.
Claim 3
Dependent Claim
29 words
The process of claim 1 wherein the infiltration temperature is 25°-100° C. above the melting point of the aluminum alloy and the time is less than about 15 minutes.
Claim 4
Dependent Claim
18 words
The process of claim 1 wherein the aluminum-lithium alloy contains at least about 60% by weight of aluminum.
Claim 5
Dependent Claim
18 words
The process of claim 3 wherein the aluminum alloy contains at least about 90% by weight of aluminum.
Claim 6
Dependent Claim
15 words
The process of claim 3 wherein the aluminum-lithium alloy contains 2-5% by weight of lithium.
Claim 7
Dependent Claim
27 words
The process of claim 3 wherein the aluminum-lithium alloy contains up to about 10% by weight of one or more metals capable of being alloyed with aluminum.
Claim 8
Dependent Claim
19 words
The process of claim 1 wherein the alumina fibers are coated with a 0.01-1 micron thick coating of silica.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein the polycrystalline alumina fibers have a translucency number of 4-5.5.
Claim 10
Dependent Claim
34 words
The process of claim 1 wherein the polycrystalline alumina fibers have a diameter of 15-30 μ, a tensile strength of at least 100,000 psi and a Young's modulus of at least 20 million psi.
Claim 11
Dependent Claim
19 words
The process of claim 1 in which a layer of flux is positioned on the surface of the alloy.
Claim 12
Dependent Claim
16 words
The process of claim 10 in which the flux is a 3:1 weight ratio of LiCl:LiF.
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) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |