US4757161A
Expired / Lapsed
US
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Composite superconducting conductor with several conductor strands and a method for manufacturing the same
Assignee: Siemens AG
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Filing: 1986-10-28
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Granted: 1988-07-12
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Expires: 2006-10-28
Abstract
Abstract A composite superconductor comprises a matrix of an alloy which is normally conductive at operating temperatures with the alloy being copper and another alloying element. Several superconducting filaments are embedded in the matrix with these filaments being formed by a diffusion reaction between at least two elements. An aluminum jacket surrounds the matrix. A barrier layer formed from at least one intermetallic copper-aluminum compound is disposed between the aluminum jacket and the alloy matrix. The aluminum jacket may be formed by extrusion at an elevated temperature with the boundary layer between the aluminum jacket and the alloy matrix being concurrently formed by diffusion.
Inventors
- 👤 Manfred Wilhelm
- 👤 Karl Wohlleben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:24
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/20; H10N60/01; H10N60/0128; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
99 words
A superconducting composite conductor comprising: (a) a matrix of an alloy which is normally conductive at operating temperatures, said alloy consisting of copper and another alloying element; (b) several superconducting filaments embedded in the matrix which consist of an intermetallic compound formed in a diffusion reaction between at least two elements; (c) an aluminum jacket surrounding the matrix; and (d) a barrier separating said jacket and matrix, said barrier consisting of a common boundary layer between the aluminum contained in the jacket and the copper contained in the matrix, said layer consisting of at least one intermetallic copper-aluminum compound.
Claim 2
Dependent Claim
99 words
A superconducting composite conductor comprising: (a) a matrix of an alloy which is normally conductive at operating temperatures, said alloy consisting of copper and another alloying element; (b) several superconducting filaments embedded in the matrix which consist of an intermetallic compound formed in a diffusion reaction between at least two elements; (c) an aluminum jacket surrounding the matrix; and (d) a barrier separating said jacket and matrix, said barrier consisting of a common boundary layer between the aluminum contained in the jacket and the copper contained in the matrix, said layer consisting of at least one intermetallic copper-aluminum compound.
Claim 3
Dependent Claim
32 words
The composite conductor of claim 1 wherein at least one element of said at least two elements of the intermetallic compound is said another alloying element of the alloy of the matrix.
Claim 4
Independent Claim
112 words
A method for manufacturing a superconducting composite conductor comprising: providing a conductor core comprised of an alloy matrix which is normally conductive at operating temperatures, said alloy matrix being copper and another alloying element, said alloy matrix having disposed therein several filaments comprised of at least one element of a superconducting material; annealing said core causing said another alloying element to diffuse into said filaments thereby rendering said filaments superconducting; providing said core with an aluminum jacket by extrusion at an elevated temperature; and concurrently with said extrusion at elevated temperature, forming by diffusion a boundary layer of at least one intermetallic copper-aluminum compound between said aluminum jacket and said alloy matrix.
Claim 5
Independent Claim
112 words
A method for manufacturing a superconducting composite conductor comprising: providing a conductor core comprised of an alloy matrix which is normally conductive at operating temperatures, said alloy matrix being copper and another alloying element, said alloy matrix having disposed therein several filaments comprised of at least one element of a superconducting material; annealing said core causing said another alloying element to diffuse into said filaments thereby rendering said filaments superconducting; providing said core with an aluminum jacket by extrusion at an elevated temperature; and concurrently with said extrusion at elevated temperature, forming by diffusion a boundary layer of at least one intermetallic copper-aluminum compound between said aluminum jacket and said alloy matrix.
Claim 6
Dependent Claim
26 words
A method according to claim 3 wherein said conductor core is provided with at least one region having an increased content of said another alloying element.
Claim 7
Dependent Claim
40 words
A method according to claim 3 wherein said superconducting filaments formed by said diffusion are an intermetallic Nb 3 Sn compound and said matrix is initially a α-bronze with a tin content of no more than about 14.5% by weight.
Claim 8
Dependent Claim
25 words
A method according to claim 4 wherein said at least one region comprises bronze with tin alloyed with up to about 10% copper by weight.
Claim 9
Dependent Claim
23 words
A method according to claim 3 wherein said extrusion is performed at a temperature in the range of 400° C. to 550° C.
Claim 10
Dependent Claim
24 words
A method according to claim 3 wherein said extrusion is performed at a temperature in the range of between 450° C. to 500° C.
Claim 11
Dependent Claim
14 words
A method according to claim 3 wherein said conductor core has a monolithic structure.
References Cited (Backward Citations)
FR1584811A
Cited
DE2056779A1
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US3778895A
Cited
DE2339525A1
Cited
DE3430159A1
Cited
US4652697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |