Patent US3926684A successfully refreshed from Google Patents.
US3926684A
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High critical current superconductors and preparation thereof
Assignee: United States Department of the Navy
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Filing: 1974-11-25
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Granted: 1975-12-16
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Expires: 1994-11-25
Abstract
Abstract A composite superconductor which comprises a core selected from the group consisting of a vanadium-gallium (V-Ga) alloy with a gallium content between 8 at. percent and 12.5 at. percent, a niobium-tin (Nb-Sn) alloy with a tin content between 2 and 12 at. percent, and a vanadium-silicon (V-Si) alloy with a silicon content between 4.5 at. percent and 10 at. percent; a matrix selected from the group consisting of copper-gallium (Cu-Ga) alloy with a gallium content from about 16 to about 22 at. percent, a copper-tin (Cu-Sn) alloy with a tin content from about 1 to about 11 at. percent, a copper-silicon (Cu-Si) alloy with a silicon content from about 5 to about 14 at. percent so that an alloy pair from the group consisting of (V-Ga)-Cu-Ga), (Nb-Sn)(Cu-Sn), and (V-Si)-(Cu-Si) is formed; and an intermediate layer of an A-15 compound selected from the group consisting of V3Ga, Nb3Sn, and V3Si whereby a correspondence with the selected alloy pair is obtained. A method for producing said composite superconductors by mechanical deformation of a single filament coaxial cylinder consisting of a core rod and a matrix sheath which comprises a homogenization anneal of the core rod and the matrix sheath before assembly thereof, a series of reductions followed by anneals, and a solid state reaction between the core rod and matrix sheath in vacuum or an inert atmosphere and at a temperature from about 475*C to 600*C for the production of V3Ga and V3Si and at a temperature from about 525*C to about 750*C for the production of Nb3Sn.
Inventors
- 👤 David G Howe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:31
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/20; H10N60/01; H10N60/0128; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9265; Y10S428/93; Y10S428/9335; Y10S428/941; Y10S505/00; Y10S505/80; Y10S505/812; Y10S505/813; Y10S505/815; Y10S505/818; Y10S505/82; Y10S505/825; Y10S505/917; Y10S505/918; Y10S505/919; Y10S505/921; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12819; Y10T428/12861; Y10T428/12903
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
A COMPOSITE SUPERCONDUCTOR WHICH COMPRISES: A CORE SELECTED FROM THE GROUP CONSISTING OF A VANADIUM-GALLIUM ALLOY WITH A GALLIUM CONTENT BETWEEN 8 AT. PERCENT AND 12.5 AT. PERCENT, A NIOBIUM-TIN ALLOY WITH A TIN CONTENT BETWEEN 2 AND 12 AT. PERCENT, AND A VANADIUM-SILICON ALLOY WITH A SILICON CONTENT BETWEEN 4.5 AT. PERCENT AND 10 AT. PERCENT; A MATRIX SELECTED FROM THE GROUP CONSISTING OF COPPER-GALLIUM ALLOY WITH A GALLIUM CONTENT FROM ABOUT 16 TO ABOUT 22 AT. PERCENT, A COPPER-TIN ALLOY WITH A TIN CONTENT FROM ABOUT 1 TO ABOUT 11 AT. PERCENT, A COPPER-SILICON ALLOY WITH A SILICON CONTENT FROM ABOUT 5 TO 14 AT. PERCENT, SO THAT THE MATRIX ALLOY HAS THE SAME METAL SOLUTE AS THE CORE ALLOY; AND AN INTERMEDIATE LAYER OF AN A-15 COMPOUND PRODUCED BY A SOLID STATE REACTION BETWEEN SAID CORE ROD AND SAID MATRIX SHEATH.
Claim 2
Dependent Claim
144 words
A COMPOSITE SUPERCONDUCTOR WHICH COMPRISES: A CORE SELECTED FROM THE GROUP CONSISTING OF A VANADIUM-GALLIUM ALLOY WITH A GALLIUM CONTENT BETWEEN 8 AT. PERCENT AND 12.5 AT. PERCENT, A NIOBIUM-TIN ALLOY WITH A TIN CONTENT BETWEEN 2 AND 12 AT. PERCENT, AND A VANADIUM-SILICON ALLOY WITH A SILICON CONTENT BETWEEN 4.5 AT. PERCENT AND 10 AT. PERCENT; A MATRIX SELECTED FROM THE GROUP CONSISTING OF COPPER-GALLIUM ALLOY WITH A GALLIUM CONTENT FROM ABOUT 16 TO ABOUT 22 AT. PERCENT, A COPPER-TIN ALLOY WITH A TIN CONTENT FROM ABOUT 1 TO ABOUT 11 AT. PERCENT, A COPPER-SILICON ALLOY WITH A SILICON CONTENT FROM ABOUT 5 TO 14 AT. PERCENT, SO THAT THE MATRIX ALLOY HAS THE SAME METAL SOLUTE AS THE CORE ALLOY; AND AN INTERMEDIATE LAYER OF AN A-15 COMPOUND PRODUCED BY A SOLID STATE REACTION BETWEEN SAID CORE ROD AND SAID MATRIX SHEATH.
Claim 3
Dependent Claim
111 words
The composite superconductor of claim 1, wherein: said core is selected from the group consisting of a vanadium-gallium said with a gallium content greater than 8.0 at. percent and up to 10.1 at. percent, a niobium-tin alloy with a tin content from 8.5 to 9.5 at. percent, and a vanadium-silicon alloy with a silicon content from 5 to 7 at. percent; and said matrix is selected from the group consisting of a copper-gallium alloy with a gallium content from 17 to 18.6 at. percent, a copper-tin alloy with a tin content from 8 to 10 at. percent, and a copper-silicon alloy with a silicon content from 9.2 to 12.0 at. percent.
Claim 4
Dependent Claim
44 words
The composite superconductor of claim 1, wherein: said core is a vanadium-gallium alloy with a gallium content between 8 at. percEnt and 12.5 at. percent; and said matrix is a copper-gallium alloy with a gallium content from about 16 to about 22 at. percent.
Claim 5
Dependent Claim
39 words
The composite superconductor of claim 3 wherein the gallium content of said core is greater than 8 at. percent and up to 10.1 at. percent and the gallium content of said matrix is from 17.0 to 18.6 at. percent.
Claim 6
Dependent Claim
19 words
The composite superconductor of claim 4 wherein the thickness of said intermediate layer is from 0.5 to 3 microns.
Claim 7
Independent Claim
291 words
A method for fabricating composite superconductors which comprises: homogenization annealing a core rod and a matrix sheath rod; reducing said rods by mechanical techniques; boring said matrix rod to form a matrix sheath; forming an end plug having axial grooves about its periphery; annealing said core rod at a temperature from about 750* to about 850*C for about 2 to about 16 hours if V-Ga or V-Si is selected, wherein a temperature of about 1050*C to about 1, 150*C is to be used for Nb-Sn; annealing said matrix sheath at temperatures from about 500*C to about 800*C for at least about one hour; etching said core rod with a HNO3-HF solution; placing said core rod within said matrix sheath whereby a composite is formed having an annular air space between said matrix sheath and said core rod, said plug being of different length to overlap the end of said matrix sheath; subjecting said composite to a vacuum; sealing said composite while under a vacuum; reducing the diameter of said composite by 20 percent; annealing said composite at a temperature from about 500* to 525*C for at least one hour; reducing the diameter of said composite by 20 percent; annealing said composite at a temperature from about 500* to about 525*C for at least 1 hour; reducing the diameter of said composite by 20 percent; annealing said composite at a temperature from about 575* to about 600*C for at least one hour; repeating the previous reduction steps until the desired diameter of the composite is obtained; and heating said composite at about 475*C to about 600*C if said composite is V-Ga, Cu-Ga or V-Si, Cu-Si, whereas if said composite is Nb-Sn, Cu-Sn, the temperature is to be about 525*C to about 750*C.
Claim 8
Independent Claim
291 words
A method for fabricating composite superconductors which comprises: homogenization annealing a core rod and a matrix sheath rod; reducing said rods by mechanical techniques; boring said matrix rod to form a matrix sheath; forming an end plug having axial grooves about its periphery; annealing said core rod at a temperature from about 750* to about 850*C for about 2 to about 16 hours if V-Ga or V-Si is selected, wherein a temperature of about 1050*C to about 1, 150*C is to be used for Nb-Sn; annealing said matrix sheath at temperatures from about 500*C to about 800*C for at least about one hour; etching said core rod with a HNO3-HF solution; placing said core rod within said matrix sheath whereby a composite is formed having an annular air space between said matrix sheath and said core rod, said plug being of different length to overlap the end of said matrix sheath; subjecting said composite to a vacuum; sealing said composite while under a vacuum; reducing the diameter of said composite by 20 percent; annealing said composite at a temperature from about 500* to 525*C for at least one hour; reducing the diameter of said composite by 20 percent; annealing said composite at a temperature from about 500* to about 525*C for at least 1 hour; reducing the diameter of said composite by 20 percent; annealing said composite at a temperature from about 575* to about 600*C for at least one hour; repeating the previous reduction steps until the desired diameter of the composite is obtained; and heating said composite at about 475*C to about 600*C if said composite is V-Ga, Cu-Ga or V-Si, Cu-Si, whereas if said composite is Nb-Sn, Cu-Sn, the temperature is to be about 525*C to about 750*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |