Claims
- 1. A structure comprising:
- (a) a cable having a plurality of copper niobium composite wires bundled about a tin-alloy core;
- (b) a layer of tantalum foil wrapped about said cable; and
- (c) an outer layer of copper wrapped about said tantalum layer.
- 2. The structure of claim 1 wherein said structure is drawn down to form a wire and the tin in the tin-alloy core is transported and reacted with the niobium by means of heat treatment within the range of 650.degree. to 800.degree. C. to form niobium tin.
- 3. The structure of claim 2 wherein the heat treatment is in the range of 700.degree.-725.degree. C.
- 4. A process for making a structure comprising the steps of:
- (a) providing a tin-alloy core; and,
- (b) wrapping a strip of copper, the copper containing a plurality of longitudinal filaments of niobium, about said core so as to form an exterior layer.
- 5. A process as described in claim 4, comprising the additional step of:
- (c) drawing the structure so formed down to a small cross-sectional area so as to form a wire.
- 6. A process as described in claim 5, comprising the additional steps of:
- (d) heat treating the wire so formed within a range of 650.degree. to 800.degree. C. so as to transport tin in the tin-alloy core and react the transported tin with the niobium so as to form the superconductor niobium tin.
- 7. A process as described in claim 4, comprising the additional steps of:
- (c) wrapping the exterior layer of copper with a layer of tantalum foil; and
- (d) covering the tantalum with an additional layer of high purity copper.
- 8. A process as described in claim 7, comprising the additional steps of:
- (e) drawing the structure so formed down to a small cross-sectional area so as to form a wire; and
- (f) heat treating the wire so formed within a range of 650.degree. to 800.degree. C. so as to transport tin in the tin-alloy core and react the transported tin with the niobium so as to form the superconductor niobium tin.
- 9. A process as described in claim 6, wherein the heat treatment is within the range of 700.degree.-750.degree. C.
- 10. The process of claim 4 wherein said strip of copper is formed by drawing and rolling a billet of copper containing a plurality of longitudinal filaments of niobium.
- 11. A process as described in claim 8, wherein the heat treatment is within the range of 700.degree.-750.degree. C.
- 12. A process for making a structure comprising the steps of:
- (a) supplying a tin-alloy core;
- (b) supplying a plurality of copper niobium composite wires;
- (c) forming a cable by bundling said composite wires about said core;
- (d) wrapping tantalum foil about said cable;
- (e) wrapping said tantalum foil with an outer layer of copper;
- (f) drawing down the structure so formed to form a wire; and
- (g) heat treating said wire within a range of 650.degree. to 800.degree. C. to cause tin to migrate to the niobium and react to form niobium tin.
- 13. The process as described in claim 12 wherein the heat treatment is within the range of 700.degree. to 750.degree. C.
Parent Case Info
This is a continuation-in-part of application Ser. No. 394,080 filed 7/1/82 which, in turn, is a continuation of application Ser. No. 178,655 filed 8/15/80, both now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (2)
Number |
Date |
Country |
2826810 |
Dec 1979 |
DEX |
142584 |
Nov 1979 |
JPX |
Non-Patent Literature Citations (4)
Entry |
Fietz, William A.; Nb.sub.3 Sn in 1978: State of the Art; IEEE Transactions on Magnetics; Jan. 1979; vol. Mag. 15, No. 1. |
Hashimoto, Y. et al.; Processing and Properties of Superconducting Nb.sub.3 Sn Filamentary Wires; Fifth International Cryogenic Engineering Conference; Kyoto, Japan, 1974. |
Suenaga, M. et al.; Superconducting Properties of Multifilamentary Nb.sub.3 Sn Made by a New Process; Applied Physics Letters, vol. 20, No. 11, Jun. 1972. |
Suenaga, W. et al.; Fabrication Techniques and Properties of Multifilamentary Nb.sub.3 Sn Conductors; IEEE Transactions on Magnetics; vol. Mag. 17, No. 1, Jan. 1971. |
Continuations (1)
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Number |
Date |
Country |
Parent |
178655 |
Aug 1980 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
394080 |
Jul 1982 |
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