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Patent US4285740A successfully refreshed from Google Patents.
US4285740A
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US
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Wrapped tantalum diffusion barrier
Assignee: Airco Inc
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Filing: 1979-11-05
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Granted: 1981-08-25
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Expires: 1999-11-05
Abstract
Abstract A multifilamentary stabilized superconductor of the A-15 type is disclosed wherein the A-15 compound is formed on rods of niobium or vanadium by diffusion of tin or gallium, respectively, from a copper alloy matrix and wherein stabilization is provided by an external layer of copper. The stabilizing copper is protected from tin or gallium diffusion by a number of spirally wrapped layers of tantalum separated from one another by copper layers.
Inventors
- 👤 Morris S. Young
- 👤 David C. Larbalestier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:10
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/20; Y; Y10; Y10S; Y10S505/00; Y10S505/80; Y10S505/815; Y10S505/823; Y10S505/825; Y10S505/917; Y10S505/918; Y10S505/919; Y10S505/92; Y10S505/921
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
A process for manufacturing a multifilamentary stabilized superconductor of the A 3 B type in which A 3 B is selected from the group consisting of Nb 3 Sn and V 3 Ga, comprising: preparing a billet of Cu and the B material having rods of the A material embedded therein; working this billet to an intermediate shape and size; wrapping the worked billet with a foil of Ta, such that at least one complete layer of Ta is formed around said worked billet; inserting a foil of a softer metal than Ta between any overlapping portions of the Ta foil, so that Ta-to-Ta contact is prevented; enclosing this wrapped assembly in a Cu tube; working this enclosed wrapped assembly to a desired final shape and size; and heat treating the finally formed assembly in order to form the A 3 B compound at the interfaces between the A material and the B material.
Claim 2
Dependent Claim
154 words
A process for manufacturing a multifilamentary stabilized superconductor of the A 3 B type in which A 3 B is selected from the group consisting of Nb 3 Sn and V 3 Ga, comprising: preparing a billet of Cu and the B material having rods of the A material embedded therein; working this billet to an intermediate shape and size; wrapping the worked billet with a foil of Ta, such that at least one complete layer of Ta is formed around said worked billet; inserting a foil of a softer metal than Ta between any overlapping portions of the Ta foil, so that Ta-to-Ta contact is prevented; enclosing this wrapped assembly in a Cu tube; working this enclosed wrapped assembly to a desired final shape and size; and heat treating the finally formed assembly in order to form the A 3 B compound at the interfaces between the A material and the B material.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein said Ta foil is formed by powder-metallurgical methods.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein the billet material is an alloy of the Cu and the B material.
Claim 5
Dependent Claim
27 words
The process of claim 1 wherein the metal softer than Ta is selected from the group consisting of Au, Ag, Al, Cu, Ni, Nb, and alloys thereof.
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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |