US4153986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing composite superconductors
Assignee: National Institute for Materials Science
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Filing: 1977-05-18
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Granted: 1979-05-15
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Expires: 1997-05-18
Abstract
Abstract A superconductor including V 3 Ga is produced by making a composite of a vanadium core metal, a continuous portion of aluminum surrounding the vandium core metal or forming a second core, and a copper, silver or copper-silver alloy containing gallium, fabricating the composite to the desired shape, and heat-treating the shaped composite. The vanadium core may contain titanium, zirconium or hafnium, and the continuous portion of aluminum may contain copper or zirconium.
Inventors
- 👤 Kyoji Tachikawa
- 👤 Kikuo Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:04
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0184; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/917; Y10S505/918; Y10S505/919; Y10S505/921; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
215 words
In a method for producing V 3 Ga super-conductors which comprises forming a composite of at least one core portion and a sheath portion, said composite having a cross-section wherein said sheath portion completely surrounds said core portion, said sheath portion being composed of a gallium-containing alloy selected from the group consisting of copper-gallium, silver-gallium, and copper-silver-gallium alloys, and said core portion being composed of a vanadium metal selected from the group consisting of vanadium and vanadium alloys containing from 0.1 to 10 atomic percent of titanium, zirconium or hafnium; longitudinally elongating said composite; and heat treating the resulting elongated composite to form a V 3 Ga layer at the interface of said sheath and core portions; the improvement comprising including a longitudinally-continuous portion of a member selected from the group consisting of aluminum and an aluminum alloy in said composite prior to elongating the same, wherein said longitudinally-continuous portion of aluminum or aluminum alloy is present in the cross-section of said sheath portion as at least one additional core portion distinct from said vanadium metal core portion and separated therefrom by the gallium-containing alloy of said sheath portion, and wherein said aluminum or aluminum alloy diffuses into said sheath portion by said heat treatment and promotes the formation of said V 3 Ga layer.
Claim 2
Dependent Claim
215 words
In a method for producing V 3 Ga super-conductors which comprises forming a composite of at least one core portion and a sheath portion, said composite having a cross-section wherein said sheath portion completely surrounds said core portion, said sheath portion being composed of a gallium-containing alloy selected from the group consisting of copper-gallium, silver-gallium, and copper-silver-gallium alloys, and said core portion being composed of a vanadium metal selected from the group consisting of vanadium and vanadium alloys containing from 0.1 to 10 atomic percent of titanium, zirconium or hafnium; longitudinally elongating said composite; and heat treating the resulting elongated composite to form a V 3 Ga layer at the interface of said sheath and core portions; the improvement comprising including a longitudinally-continuous portion of a member selected from the group consisting of aluminum and an aluminum alloy in said composite prior to elongating the same, wherein said longitudinally-continuous portion of aluminum or aluminum alloy is present in the cross-section of said sheath portion as at least one additional core portion distinct from said vanadium metal core portion and separated therefrom by the gallium-containing alloy of said sheath portion, and wherein said aluminum or aluminum alloy diffuses into said sheath portion by said heat treatment and promotes the formation of said V 3 Ga layer.
Claim 3
Dependent Claim
23 words
The method of claim 6 wherein the gallium-containing alloy in the sheath portion further contains from 0.1 to 10 atomic percent of lead.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the aluminum alloy is selected from the group consisting of an aluminum-copper alloy and an aluminum-zirconium alloy.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein the heat-treatment is carried out at a temperature of from 450° to 950° C.
Claim 6
Dependent Claim
23 words
The method of claim 4 wherein the heat-treatment is carried out for a period of time of from 5 minutes to 500 hours.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein said gallium-containing alloy contains from 5 to 25 atomic percent of gallium.
Claim 8
Dependent Claim
18 words
The method of claim 3 wherein said aluminum-copper alloy contains from 0.1 to 8 atomic percent of copper.
Claim 9
Dependent Claim
18 words
The method of claim 3 wherein said aluminum-copper alloy contains from 1 to 4 atomic percent of copper.
Claim 10
Dependent Claim
18 words
The method of claim 3 wherein said aluminum-zirconium alloy contains from 0.1 to 2 atomic percent of zirconium.
Claim 11
Dependent Claim
18 words
The method of claim 3 wherein said aluminum-zirconium alloy contains from 0.5 to 1 atomic percent of zirconium.
Claim 12
Dependent Claim
32 words
The method of claim 1 wherein the cross-sectional area of said continuous portion of aluminum or aluminum alloy is from 0.1 to 30% of the total cross-sectional area of said elongated composite.
Claim 13
Dependent Claim
32 words
The method of claim 1 wherein the cross-sectional area of said continuous portion of aluminum or aluminum alloy is from 0.5 to 15% of the total cross-sectional area of said elongated composite.
Claim 14
Dependent Claim
18 words
The method of claim 1 wherein the gallium-containing alloy contains from 5 to 21 atomic percent of gallium.
Claim 15
Dependent Claim
23 words
The method of claim 2 wherein the gallium-containing alloy in the sheath portion further contains from 1 to 4 atomic percent of lead.
Claim 16
Dependent Claim
20 words
The method of claim 1 wherein the heat-treatment is carried out at a temperature of from 550° to 750° C.
Claim 17
Dependent Claim
23 words
The method of claim 15 wherein the heat-treatment is carried out for a period of time of from 60 minutes to 500 hours.
Claim 18
Dependent Claim
24 words
The method of claim 1 wherein said gallium-containing alloy is copper-gallium, wherein said vanadium metal is vanadium and wherein said aluminum member is aluminum.
Claim 19
Dependent Claim
25 words
The method of claim 1 wherein said gallium-containing alloy is copper-gallium, wherein said vanadium metal is vanadium and wherein said aluminum member is aluminum-copper alloy.
Claim 20
Dependent Claim
25 words
The method of claim 1 wherein said gallium-containing alloy is copper-gallium, wherein said vanadium metal is vanadium and wherein said aluminum member is aluminum-zirconium alloy.
Claim 21
Dependent Claim
25 words
The method of claim 1 wherein said gallium-containing alloy is copper-gallium, wherein said vanadium metal is vanadium-zirconium alloy and wherein said aluminum member is aluminum.
Claim 22
Dependent Claim
26 words
The method of claim 1 wherein said gallium-containing alloy is copper-gallium, wherein said vanadium metal is vanadium-zirconium alloy and wherein said aluminum member is aluminum-copper alloy.
References Cited (Backward Citations)
US3868768A
Cited
US3874074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |