US4759995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of metal matrix composites by casting and composite therefrom
Assignee: Novelis Corp
•
Filing: 1986-05-01
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Granted: 1988-07-26
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Expires: 2006-05-01
Abstract
Abstract Silicon carbide particulate reinforced aluminum alloy matrix composites are formed using techniques which include agitation of a melt of aluminum alloy, containing magnesium, and silicon carbide particulates in a manner whereby the silicon carbide particles are maintained, during agitation, within the body of the melt; the agitation, which involves shearing or wiping of the particles in the liquid, is carried out under vacuum; and may involve incorporation into the melt of an additional amount of magnesium such that that amount compensates for the amount of magnesium which segregates to the carbide surfaces, and is sufficient to effect strengthening of the resulting composite. Aluminum alloy matrix composites, containing copper, are produced using similar agitation and mixing procedures, with the copper being incorporated in such a way as to discourage reaction between the copper and SiC particles.
Inventors
- 👤 Michael D. Skibo
- 👤 David M. Schuster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:49
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/10; C22C1/1036; C22C32/00; C22C32/0047; C22C32/0052; C22C32/0063; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
128 words
A method for producing a composite of an aluminum alloy reinforced with particles of refractory ceramic material, which comprises: melting an aluminum alloy in a crucible, under cover of an inert gas; introducing an inert gas into the body of the melt to remove hydrogen from the melt, and bring oxide particles to the surface; adding the particles of the refractory ceramic material to the melt while maintaining the surface of the melt under cover of the inert gas; mixing the particles of the refractory ceramic material and melt, under vacuum, by means of an impeller which effects sufficient shearing and wiping to wet the refractory material with the melt and form a substantially homogeneous mixture of refractory material with the aluminum alloy; and casting the resulting mixture.
Claim 2
Independent Claim
128 words
A method for producing a composite of an aluminum alloy reinforced with particles of refractory ceramic material, which comprises: melting an aluminum alloy in a crucible, under cover of an inert gas; introducing an inert gas into the body of the melt to remove hydrogen from the melt, and bring oxide particles to the surface; adding the particles of the refractory ceramic material to the melt while maintaining the surface of the melt under cover of the inert gas; mixing the particles of the refractory ceramic material and melt, under vacuum, by means of an impeller which effects sufficient shearing and wiping to wet the refractory material with the melt and form a substantially homogeneous mixture of refractory material with the aluminum alloy; and casting the resulting mixture.
Claim 3
Independent Claim
59 words
A method for producing a composite of aluminum alloy reinforced with particles of a refractory ceramic material, which comprises: melting an aluminum alloy; adding refractory ceramic particles to said melt; agitating the mixture of particles and melt under vacum to effect sufficient shearing and wiping to substantially wet the particles with the molten metal; and casting the resulting mixture.
Claim 4
Independent Claim
59 words
A method for producing a composite of aluminum alloy reinforced with particles of a refractory ceramic material, which comprises: melting an aluminum alloy; adding refractory ceramic particles to said melt; agitating the mixture of particles and melt under vacum to effect sufficient shearing and wiping to substantially wet the particles with the molten metal; and casting the resulting mixture.
Claim 5
Independent Claim
95 words
A method for producing a composite of aluminum alloy reinforced with particles of refractory ceramic material which comprises: melting aluminum or aluminum alloy in a crucible under cover of an inert gas; adding particles of the refractory ceramic material to the melt while minimizing the introduction of gas into the melt; agitating the mixture of refractory material and melt under vacuum to effect sufficient shearing and wiping to substantially wet the refractory material with the melt and form a substantially homogeneous mixture of refractory material and alloy; casting the resulting mixture to form a billet.
Claim 6
Independent Claim
95 words
A method for producing a composite of aluminum alloy reinforced with particles of refractory ceramic material which comprises: melting aluminum or aluminum alloy in a crucible under cover of an inert gas; adding particles of the refractory ceramic material to the melt while minimizing the introduction of gas into the melt; agitating the mixture of refractory material and melt under vacuum to effect sufficient shearing and wiping to substantially wet the refractory material with the melt and form a substantially homogeneous mixture of refractory material and alloy; casting the resulting mixture to form a billet.
Claim 7
Independent Claim
26 words
A method according to claims 1, 2 or 3 wherein the refractory ceramic material is selected from the group consisting of metallic oxides, carbides, and nitrides.
Claim 8
Independent Claim
17 words
A method according to claims 1, 2 or 3 wherein the refractory ceramic material is silicon carbide.
Claim 9
Independent Claim
26 words
A method according to claims 1, 2 or 3, wherein the aluminum alloy is selected from the group consisting of 6061, 7075, 7079, and 2024 alloys.
Claim 10
Dependent Claim
19 words
A composite prepared by the process of claim 2, wherein said step of agitating is accomplished by an impeller.
Claim 11
Dependent Claim
9 words
A composite prepared by the method of claim 1.
Claim 12
Dependent Claim
9 words
A composite prepared by the method of claim 2.
Claim 13
Dependent Claim
9 words
A composite prepared by the method of claim 3.
Claim 14
Dependent Claim
13 words
The method of claim 1, wherein the refractory ceramic material is aluminum oxide.
Claim 15
Dependent Claim
13 words
The method of claim 2, wherein the refractory ceramic material is aluminum oxide.
Claim 16
Dependent Claim
13 words
The method of claim 3, wherein the refractory ceramic material is aluminum oxide.
References Cited (Backward Citations)
US2375211A
Cited
US2793949A
Cited
US3227547A
Cited
US3759708A
Cited
US3468658A
Cited
US3432295A
Cited
US3515542A
Cited
US3889348A
Cited
US3728108A
Cited
US3626073A
Cited
US3753694A
Cited
US3887365A
Cited
US3961945A
Cited
US3858640A
Cited
US3888661A
Cited
US4060412A
Cited
US4080200A
Cited
US4318438A
Cited
US4383970A
Cited
US4259112A
Cited
US4489138A
Cited
US4492265A
Cited
US4463058A
Cited
US4452865A
Cited
US4473103A
Cited
US4435213A
Cited
US4450207A
Cited
US4481031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |