US4973522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum alloy composites
Assignee: Rio Tinto Alcan International Ltd
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Filing: 1988-06-02
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Granted: 1990-11-27
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Expires: 2008-06-02
Abstract
Abstract A metal matrix composite may be produced by atomizing a stream of molten aluminum-lithium alloy to form a spray of hot metal particles by subjecting the stream to relatively cold gas directed at the stream, applying to the stream or spray fine solid particles of reinforcement e.g. silicon carbide, and depositing the metal having the fine particles incorporated therein. The resulting composite has the following properties in an extruded and age hardened state: 0.2% Proof strength - at least 400 MPa Tensile strength - at least 440 MPa Elongation - at least 2.0% Modulus of elasticity - at least 85 GPa Density - maximum 2.75 Mg/m 3 .
Inventors
- 👤 Richard M. Jordan
- 👤 John White
- 👤 Treve C. Willis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:15
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0052; C22C32/0063; B; B22; B22D; B22D23/00; B22D23/003; C22C1/00; C22C1/04; C22C1/0408; C22C1/0416; C22C1/10; C22C1/1005; C22C1/101; C22C1/1036; C22C1/1042; C22C21/00; C22C21/12; C22C21/16; C22C32/0057; C23; C23C; C23C4/00; C23C4/12; C23C4/123; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
A metal matrix composite produced by spray deposition comprising an Al-Li alloy matrix and a reinforcement and having the following properties in an extruded and T6 age hardened state: 0.2% Proof strength--at least 400 MPa Tensile strength--at least 440 MPa Elongation--at least 2.0% Modulus of elasticity--at least 85 GPa Density--maximum 2.75 Mg/m 3 wherein the alloy matrix contains one or more of copper from 1.0% to 5.0% by weight; and zirconium from 0.04% to 0.20% by weight.
Claim 2
Dependent Claim
77 words
A metal matrix composite produced by spray deposition comprising an Al-Li alloy matrix and a reinforcement and having the following properties in an extruded and T6 age hardened state: 0.2% Proof strength--at least 400 MPa Tensile strength--at least 440 MPa Elongation--at least 2.0% Modulus of elasticity--at least 85 GPa Density--maximum 2.75 Mg/m 3 wherein the alloy matrix contains one or more of copper from 1.0% to 5.0% by weight; and zirconium from 0.04% to 0.20% by weight.
Claim 3
Dependent Claim
17 words
A composite as claimed in claim 1, containing from 5 to 30% by volume of the reinforcement.
Claim 4
Dependent Claim
27 words
A composite as claimed in claim 1, wherein the reinforcement is in the form of particles having a mean diameter in the range 5 to 40 microns.
Claim 5
Dependent Claim
13 words
A composite as claimed in claim 1, wherein the reinforcement is silicon carbide.
Claim 6
Dependent Claim
13 words
A composite as claimed in claim 1, wherein the reinforcement is boron carbide.
Claim 7
Dependent Claim
22 words
A composite as claimed in claim 1, wherein the lithium content of the metal matrix is from 1% to 3% by weight.
Claim 8
Dependent Claim
65 words
A composite as claimed in claim 1, produced by a method comprising the steps of atomising a stream of the molten Al-Li alloy to form a spray of hot metal particles by subjecting the stream to relatively cold gas directed at the stream, applying to the stream or spray fine solid particles of the reinforcement, and depositing the metal having said fine particles incorporated therein.
Claim 9
Dependent Claim
19 words
A composite as claimed in claim 1, wherein the Al-Li alloy matrix contains up to 0.5% by weight silicon.
Claim 10
Dependent Claim
38 words
A composite as in claim 1, wherein the Al-Li alloy matrix further contains one or more of copper 1.9% to 2.2% by weight; magnesium from 0.5% to 1.3% by weight; and zirconium from 0.04% to 0.16% by weight.
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JPS60194039A
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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) | 1993-11-26 | 1994-05-28 | 1994-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-26 | 1998-05-28 | 1998-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-26 | 2002-05-28 | 2002-11-27 | $7700.00 | Window Closed / Lapsed |