Claims
- 1. In a process of preparing a composite high temperature oxide superconductive wire including filling a metal tube with an oxide superconductive powder material, reducing the cross-sectional dimensions of the tube through a multiple of cross-sectional reduction steps, and sintering the oxide superconductive powder material to produce a resultant composite high temperature oxide superconductive wire, the improvement comprising at least one cross-sectional reduction step being conducted at sub-ambient temperatures.
- 2. The process of claim 1 wherein said at least one cross-sectional reduction step is conducted at temperatures of less than about 100 K.
- 3. The process of claim 1 wherein all cross-sectional reduction steps are conducted at sub-ambient temperatures.
- 4. The process of claim 3 wherein said at least one cross-sectional reduction step is conducted at temperatures of less than about 100 K.
- 5. The process of claim 3 wherein all said cross-sectional reduction steps are conducted at temperatures of less than about 100 K.
- 6. The process of claim 1 wherein said metal tube is selected from the group consisting of silver, gold, silver-alloys and gold-alloys.
- 7. The process of claim 1 wherein said oxide superconductive powder material is Bi-2223.
- 8. The process of claim 1 wherein said oxide superconductive powder material is Bi-2212.
- 9. A superconductive wire comprising an oxide superconductor core surrounded by a metal sheath, said metal sheath further characterized as having a greater dislocation density than wire reduced at ambient temperatures, and said oxide superconductor core further characterized as having substantial uniformity in cross sectional dimensions.
- 10. The wire of claim 9 wherein said oxide superconductor is Bi-2223.
- 11. The wire of claim 9 wherein said oxide superconductor is Bi-2212.
- 12. The wire of claim 9 wherein said metal sheath is selected from the group consisting of silver, gold, silver-alloys and gold-alloys.
- 13. The wire of claim 10 wherein said metal sheath is selected from the group consisting of silver, gold, silver-alloys and gold-alloys.
- 14. The wire of claim 10 wherein said metal sheath is of a cubic centered metal and is further characterized as having a dislocation density of greater than about 1012/cm2.
- 15. The wire of claim 14 wherein said cubic metal sheath is of a face centered cubic metal.
- 16. The wire of claim 14 wherein said cubic metal sheath is of a body centered cubic metal.
- 17. The wire of claim 14 wherein said cubic metal sheath is of a metal selected from the group consisting of silver and silver alloys.
Government Interests
[0001] This invention is the result of a contract with the United States Department of Energy (Contract No. W7405-ENG-36). The government has certain rights in the invention.
Continuations (1)
|
Number |
Date |
Country |
Parent |
08814306 |
Mar 1997 |
US |
Child |
09955714 |
Sep 2001 |
US |