US4665611A
Expired / Lapsed
US
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Method of fabricating superconductive electrical conductor
Assignee: Fujikura Ltd
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Filing: 1986-02-19
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Granted: 1987-05-19
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Expires: 2006-02-19
Abstract
Abstract A method of fabricating a superconductive electrical conductor of Nb 3 Sn type comprises a step of covering an elongated core member made of Nb with a covering member made of a third element selected from the group consisting of Ti, Ta, In, Hf, Al and Si. The core member covered with the covering member is covered with a tubular matrix made of a Cu-Sn alloy or a combination of Cu with Sn to form a composite wire element. Such wire elements are assembled in a tubular matrix made of a Cu-Sn alloy, Cu or a combination of Cu with Sn and reduced in diameter to form a multi-core composite wire element having a desired diameter. The assembling and reducing processing is effected at least one to form a multi-core composite wire which is then subjected to a diffusion heat-treatment to form an intermetallic compound of Nb 3 Sn and the third element in the peripheral portion of the core member.
Inventors
- 👤 Nobuyuki Sadakata
- 👤 Yoshimitsu Ikeno
- 👤 Masaru Sugimoto
- 👤 Osamu Kohno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:41
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0184; Y; Y10; Y10S; Y10S505/00; Y10S505/80; Y10S505/815; Y10S505/818; Y10S505/821; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
246 words
A method of fabricating a superconductive electrical conductor of Nb 3 Sn type comprising the steps of: covering an elongated core member made of Nb with a covering member consisting of a third element for improvement of a critical current of Nb 3 Sn contained in the superconductive electrical conductor; covering said elongated core member covered with said covering member with a first tubular matrix made of any one of a Cu-Sn alloy and a combination of Cu with Sn to form a first composite wire element; reducing said first composite wire element to a predetermined diameter to form a second composite wire element; assembling a predetermined number of said second composite wire elements in a second tubular matrix made of any one of a Cu-Sn alloy, Cu and a combination of Cu with Sn to form a third composite wire element; reducing said third composite wire element to a predetermined diameter to form a fourth composite wire element; assembling a predetermined number of said fourth composite wire elements in a third tubular matrix made of any one of a Cu-Sn alloy, Cu and a combination of Cu with Sn, and subsequently reducing said third tubular matrix having therein said fourth composite wire elements to a predetermined diameter to form a multi-core composite wire; and subjecting said multi-core composite wire to a diffusion heat-treatment to form an intermetallic compound of Nb 3 Sn and said third element in a peripheral portion of said Nb core member.
Claim 2
Independent Claim
246 words
A method of fabricating a superconductive electrical conductor of Nb 3 Sn type comprising the steps of: covering an elongated core member made of Nb with a covering member consisting of a third element for improvement of a critical current of Nb 3 Sn contained in the superconductive electrical conductor; covering said elongated core member covered with said covering member with a first tubular matrix made of any one of a Cu-Sn alloy and a combination of Cu with Sn to form a first composite wire element; reducing said first composite wire element to a predetermined diameter to form a second composite wire element; assembling a predetermined number of said second composite wire elements in a second tubular matrix made of any one of a Cu-Sn alloy, Cu and a combination of Cu with Sn to form a third composite wire element; reducing said third composite wire element to a predetermined diameter to form a fourth composite wire element; assembling a predetermined number of said fourth composite wire elements in a third tubular matrix made of any one of a Cu-Sn alloy, Cu and a combination of Cu with Sn, and subsequently reducing said third tubular matrix having therein said fourth composite wire elements to a predetermined diameter to form a multi-core composite wire; and subjecting said multi-core composite wire to a diffusion heat-treatment to form an intermetallic compound of Nb 3 Sn and said third element in a peripheral portion of said Nb core member.
Claim 3
Dependent Claim
86 words
A method of fabricating a superconductive electrical conductor according to claim 1, wherein said multi-core composite wire before said step of diffusion heat-treatment is further subjected to at least one step of assembling processing wherein a predetermined number of said multi-core composite wires are assembled in a fourth tubular matrix made of any one of a Cu-Sn alloy, Cu and a combination of Cu with Sn, and subsequently reduced to a predetermined diameter to form another multi-core composite wire to be subjected to said diffusion heat-treatment.
Claim 4
Dependent Claim
49 words
A method of fabricating a superconductive electrical conductor according to claim 1 further comprising, before said step of diffusion heat-treatment, the step of covering any one of said second and fourth composite wire elements and said multi-core composite wires with a second covering member made of said third element.
Claim 5
Dependent Claim
49 words
A method of fabricating a superconductive electrical conductor according to claim 2 further comprising, before said step of diffusion heat-treatment, the step of covering any one of said second and fourth composite wire elements and said multi-core composite wires with a second covering member made of said third element.
Claim 6
Dependent Claim
38 words
A method of fabricating a superconductive electrical conductor according to claim 1 or claim 2, wherein any one of said second to fourth tubular matrix is plated with a layer of Sn at an outer peripheral surface thereof.
Claim 7
Independent Claim
61 words
A method of fabricating a superconductive electrical conductor according to any one of claims 1 to 4 further comprising, before said step of diffusion heat-treatment, the step of covering any one of said second and fourth composite wire elements and said multi-core composite wires with a tubular member made of a material which functions as a barrier to said third element.
Claim 8
Dependent Claim
42 words
A method of fabricating a superconductive electrical conductor according to claim 6 further comprising, after said covering step with said tubular member of the barrier material, the step of covering said tubular member of the barrier material with a stabilizing copper tube.
Claim 9
Dependent Claim
37 words
A method of fabricating a superconductive electrical conductor according to claim 6 further comprising, after said assembling step of the composite wire elements covered with said tubular member of the barrier material, with a stabilizing copper tube.
Claim 10
Dependent Claim
30 words
A method of fabricating a superconductive electrical conductor according to claim 1, wherein said third element is selected from the group consisting of Ti, Ta, In, Hf, Al and Si.
Claim 11
Dependent Claim
30 words
A method of fabricating a superconductive electrical conductor according to claim 9, wherein said core member takes the form of any one of a tube, a foil and a tape.
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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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |