US4836979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of composite structures
Assignee: Vale Canada Ltd
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Filing: 1988-06-14
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Granted: 1989-06-06
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Expires: 2008-06-14
Abstract
Abstract A method of producing a composite material from a mixture of copper and a low coefficient of thermal expansion nickel-iron alloy (Invar) powder is disclosed wherein advantageously at least part of the copper is deposited on the Invar powder prior to processing. Processing includes cold compacting to a green strip or other configuration, annealing in the temperature range of 550°-750° C. and working the annealed material at a temperature in that range to high density.
Inventors
- 👤 James A. E. Bell
- 👤 Thijs Eerkes
- 👤 Carlos M. Diaz
- 👤 William L. Mankins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:35
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/01; H10W70/02; B; B22; B22F; B22F1/00; B22F1/17; C; C22; C22C; C22C9/00; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05; H05K2201/00; H05K2201/06; H05K2201/068; H05K2203/00; H05K2203/03; H05K2203/0323
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
120 words
A process for making a composite of a low expansion, high electrical and heat conductive material in which the low expansion component is a nickel-iron alloy and the high electrical and heat conductive material is selected from the group consisting of copper, silver and copper-silver alloys comprising: (a) producing a green compact of nickel-iron and a material selected from the group consisting of copper, silver, and copper-silver alloys of the chemical composition required for said composite; (b) heating said green compact for about 2 to about 60 minutes in a protective atmosphere at a temperature of about 550° C. to 750° C.; and (c) working the thus heated compact within said temperature range to at least about 95% theoretical density.
Claim 2
Dependent Claim
120 words
A process for making a composite of a low expansion, high electrical and heat conductive material in which the low expansion component is a nickel-iron alloy and the high electrical and heat conductive material is selected from the group consisting of copper, silver and copper-silver alloys comprising: (a) producing a green compact of nickel-iron and a material selected from the group consisting of copper, silver, and copper-silver alloys of the chemical composition required for said composite; (b) heating said green compact for about 2 to about 60 minutes in a protective atmosphere at a temperature of about 550° C. to 750° C.; and (c) working the thus heated compact within said temperature range to at least about 95% theoretical density.
Claim 3
Dependent Claim
15 words
A process as in claim 1 wherein the material selected from said group is copper.
Claim 4
Dependent Claim
28 words
A process as in claim 1 wherein the composite contains about 20 to 50 weight percent copper, balance nickel-iron alloy containing about 32 to 40 weight percent nickel.
Claim 5
Dependent Claim
23 words
A process as in claim 1 wherein the metal powder employed in the process has an average particle size of about 44-200 micrometers.
Claim 6
Dependent Claim
18 words
A process as in claim 1 wherein the green compact and the final product are produced by rolling.
Claim 7
Dependent Claim
14 words
A process as in claim 1 wherein said protective atmosphere is a reducing atmosphere.
Claim 8
Dependent Claim
174 words
A process for making a composite low expansion, high electrical and heat conductive material in which the low expansion component is a nickel-iron alloy and the high electrical and heat conductive material is selected from the group consisting of copper, silver and copper-silver alloys comprising: (a) depositing at least about 2% of the material from the group consisting of copper, silver and copper-silver alloys in said composite from a liquid held at a temperature less than about 110° C. onto powder particles of said nickel-iron alloy at least about 44 micrometers in average dimension; (b) blending, if necessary, the product powder produced in step (a) with additional powder material, if any, of said group to provide powder of said composite chemical composition; (c) producing a green compact of the powder of said composite chemical composition; (d) heating said green compact for about 2 to about 60 minutes in a protective atmosphere at a temperature of about 550°-750° C.; and (e) working the thus heated compact within said temperature range to substantially 100% theoretical density.
Claim 9
Dependent Claim
174 words
A process for making a composite low expansion, high electrical and heat conductive material in which the low expansion component is a nickel-iron alloy and the high electrical and heat conductive material is selected from the group consisting of copper, silver and copper-silver alloys comprising: (a) depositing at least about 2% of the material from the group consisting of copper, silver and copper-silver alloys in said composite from a liquid held at a temperature less than about 110° C. onto powder particles of said nickel-iron alloy at least about 44 micrometers in average dimension; (b) blending, if necessary, the product powder produced in step (a) with additional powder material, if any, of said group to provide powder of said composite chemical composition; (c) producing a green compact of the powder of said composite chemical composition; (d) heating said green compact for about 2 to about 60 minutes in a protective atmosphere at a temperature of about 550°-750° C.; and (e) working the thus heated compact within said temperature range to substantially 100% theoretical density.
Claim 10
Dependent Claim
15 words
A process as in claim 7 wherein the material selected from said group is copper.
Claim 11
Dependent Claim
28 words
A process as in claim 7 wherein the composite contains about 20 to 50 weight percent copper, balance nickel-iron alloy containing about 32 to 40 weight percent nickel.
Claim 12
Dependent Claim
23 words
A process as in claim 7 wherein the metal powder employed in the process has an average particle size of about 44-200 micrometers.
Claim 13
Dependent Claim
18 words
A process as in claim 7 wherein the green compact and the final product are produced by rolling.
Claim 14
Dependent Claim
14 words
A process as in claim 7 wherein said protective atmosphere is a reducing 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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |