US4885273A
Expired / Lapsed
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Method of producing a superconducting wire using alloy preform
Assignee: Fujikura Ltd
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Filing: 1988-03-18
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Granted: 1989-12-05
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Expires: 2008-03-18
Abstract
Abstract A method of producing a superconducting wire including A-B-C-D system oxide superconductor wherein A is an at least one element of group IIIa of the Periodic Table, B is an at least one alkali earth metal, C includes Cu and D includes O. In the method, a material containing at least one of both A and B is arranged inside or outside an elongated tubular coating layer, which includes a copper alloy and at least the other one, to form a composite element. Then, the composite element undergoes a heat treatment to produce the superconductor.
Inventors
- 👤 Mamoru Sugimoto
- 👤 Osamu Kohno
- 👤 Yoshimitsu Ikeno
- 👤 Nobuyuki Sadakata
- 👤 Shin'ya Aoki
- 👤 Mikio Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0801; H10N60/20; H10N60/203; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
A method of producing a superconductor including an A-B-C-D system oxide superconductor wherein the A contains at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, the B at least one element selected from the group consisting of Be, Sr, Mg, Ca, Ba and Ra, the C copper and the D oxygen, comprising the steps of: (a) arranging a material containing one of said A and B inside or outside an elongated tubular layer to surround the tubular layer to form a preform, the tubular layer including an alloy of copper and the other of A and B, the material or the tubular layer including oxygen; (b) subsequently, reducing in thickness the preform to form a thickness reduced composite; and (c) heating the thickness reduced composite to produce the oxide superconductor.
Claim 2
Independent Claim
149 words
A method of producing a superconductor including an A-B-C-D system oxide superconductor wherein the A contains at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, the B at least one element selected from the group consisting of Be, Sr, Mg, Ca, Ba and Ra, the C copper and the D oxygen, comprising the steps of: (a) arranging a material containing one of said A and B inside or outside an elongated tubular layer to surround the tubular layer to form a preform, the tubular layer including an alloy of copper and the other of A and B, the material or the tubular layer including oxygen; (b) subsequently, reducing in thickness the preform to form a thickness reduced composite; and (c) heating the thickness reduced composite to produce the oxide superconductor.
Claim 3
Dependent Claim
68 words
A method as recited in claim 1, wherein the A contains Y; the B contains Ba; the tubular layer is a Cu alloy pipe ; said material containing one of A and B contains a powder of an oxide of said one of A and B; and the thickness reduced composite is heated at about 700° C. to about 1300° C. for about 1 to about 300 hours.
Claim 4
Dependent Claim
22 words
A method as recited in claim 2, wherein the superconductor includes orthorhombic Y 1 Ba 2 Cu 3 O 9-x where 2<x<3.
Claim 5
Dependent Claim
16 words
A superconducting wire produced according to the method as recited in claim 1, 2 or 3.
Claim 6
Dependent Claim
74 words
The method of claim 1, wherein said tubular layer is a copper alloy pipe made of the alloy of copper and said other of A and B; said material containing one of A and B, contains a powder mixture of both an oxide of said one of A and B and CuO; and the arranging step (a) comprises the step of charging the powder mixture into the copper alloy pipe to form the preform.
Claim 7
Dependent Claim
70 words
The method of claim 1, wherein said tubular layer is a copper alloy pipe made of the alloy of copper and said other of A and B; said material, containing one of A and B, has a rod shape; and the arranging step (a) comprises placing a copper pipe containing oxygen, within the copper alloy pipe and inserting the rod shaped material into the copper pipe for forming the preform.
Claim 8
Dependent Claim
96 words
The method of claim 1, wherein the tubular layer is a copper alloy pipe made of the alloy of copper and at least said other of A and B; said material containing said one of A and B has a rod shape; and the arranging step (a) comprises placing the rod shaped material within the copper alloy pipe for forming the preform; and further comprising, before the heating step, coating an oxide layer over the thickness reduced composite of step (b) for supplying a sufficient amount of oxygen to produce the superconductor in heating step (c).
Claim 9
Independent Claim
140 words
A method of producing an oxide superconductor including an A-B-C-D system oxide superconductor wherein the A contains at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, the B at least one element selected from the group consisting of Be, Sr, Mg, Ca, Ba and Ra, the C copper and the D oxygen, comprising the steps of: (a) reducing in thickness an alloy rod material made of an alloy of copper and one of A and B; (b) subsequently, coating the thickness reduced rod with a layer containing the other of A and B to form a composite, said layer further including oxygen in a sufficient amount to produce the oxide superconductor; and (c) heating the composite to produce the oxide superconductor.
Claim 10
Independent Claim
140 words
A method of producing an oxide superconductor including an A-B-C-D system oxide superconductor wherein the A contains at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, the B at least one element selected from the group consisting of Be, Sr, Mg, Ca, Ba and Ra, the C copper and the D oxygen, comprising the steps of: (a) reducing in thickness an alloy rod material made of an alloy of copper and one of A and B; (b) subsequently, coating the thickness reduced rod with a layer containing the other of A and B to form a composite, said layer further including oxygen in a sufficient amount to produce the oxide superconductor; and (c) heating the composite to produce the oxide superconductor.
Claim 11
Dependent Claim
96 words
The method of claim 9, wherein the alloy rod is in the shape of a hollow rod, the alloy rod having an anti-oxidation metallic rod as a core member fitted therein; said layer comprises a sub-layer, containing said other of A and B and an oxide film layer; the coating step (b) comprises, before the heating step (c), forming an oxide film layer over the thickness reduced rod, and coating the sub-layer over the oxide film layer; and further comprising before the thickness reducing step (a), fitting the anti-oxidation metallic rod in the hollow alloy rod.
References Cited (Backward Citations)
No citation records indexed.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |