Superconductor and method for superconductor manufacturing
Disclosed is a superconducting article comprising a silver overlayer consisting of no more than about 20% of grains over about 1 μm, having a minimum Vickers micro-hardness value of about 100, and a porosity of less than about 1%. A method of manufacturing a superconducting tape is disclosed as comprising, deposition of silver, oxygenation at about 400° C. for about 30 minutes, slitting, deposition of silver at a temperature of less than about 250° C., and application of copper.
1. A superconducting tape comprising:
a substrate;
a biaxially-textured buffer layer overlying the substrate;
a superconducting film on the buffer layer; and
a silver layer deposited on the superconducting film, comprising:
an oxygenated first silver layer comprising a porosity of less than about 1%, and
a second silver layer formed on the first silver layer, wherein the second silver layer is not oxygenated,
wherein the silver layer comprises less than about 20% of silver grains over about 1 μm in size.
2. The tape of claim 1 , wherein the silver layer has a minimum Vickers micro-hardness value of about 100.
3. The tape of claim 1 , further comprising a copper layer overlying the silver layer.
4. A superconducting tape comprising:
a substrate;
a biaxially-textured buffer layer overlying the substrate;
a superconducting film on the buffer layer; and
a silver layer deposited on the superconducting film, comprising:
an oxygenated first silver layer, and
a final silver layer disposed above the first silver layer, wherein the final silver layer is not oxygenated.
5. The tape of claim 4 , wherein the silver layer comprises less than about 20% of silver grains over about 1 μm in size.
6. A superconducting tape comprising:
a substrate;
a biaxially-textured buffer layer overlying the substrate;
a superconducting film on the buffer layer; and
a silver layer deposited on the superconducting film, comprising:
a first silver layer comprising a porosity of less than about 1%, and
a second silver layer deposited on the first silver layer, wherein the second silver layer is not oxygenated, and wherein the silver layer comprises less than about 20% of silver grains over about 1 μm in size.
7. The tape of claim 6 , wherein the silver layer has a minimum Vickers micro-hardness value of about 100.
8. A superconducting tape comprising:
a substrate;
a biaxially-textured buffer layer overlying the substrate;
a superconducting film on the buffer layer; and
a silver layer deposited on the superconducting film, comprising:
a first silver layer, and
a final silver layer disposed above the first silver layer, wherein the final silver layer is not oxygenated;
wherein the first silver layer comprises a porosity of less than about 1%.
9. A superconducting tape comprising:
a substrate;
a biaxially-textured buffer layer overlying the substrate;
a superconducting film on the buffer layer; and
a silver layer deposited on the superconducting film, comprising:
a first silver layer, and
a final silver layer disposed above the first silver layer, wherein the final silver layer is not oxygenated;
wherein the silver layer has a minimum Vickers micro-hardness value of about 100.
10. A superconducting tape comprising:
a substrate;
a biaxially-textured buffer layer overlying the substrate;
a superconducting film on the buffer layer; and
a silver layer deposited on the superconducting film, comprising:
an oxygenated first silver layer; and
a second silver layer deposited on the first silver layer, wherein the second silver layer is not oxygenated.
11. The tape of claim 10 , wherein the silver layer comprises less than about 20% of silver grains over about 1 μm in size.
12. A superconducting tape comprising:
a substrate;
a biaxially-textured buffer layer overlying the substrate;
a superconducting film on the buffer layer; and
a silver layer deposited on the superconducting film, comprising:
a first silver layer; and
a second silver layer deposited on the first silver layer, wherein the second silver layer is not oxygenated;
wherein the first silver layer comprises a porosity of less than about 1%.
13. A superconducting tape comprising:
a substrate;
a biaxially-textured buffer layer overlying the substrate;
a superconducting film on the buffer layer; and
a silver layer deposited on the superconducting film, comprising:
a first silver layer; and
a second silver layer deposited on the first silver layer, wherein the second silver layer is not oxygenated;
wherein the silver layer has a minimum Vickers micro-hardness value of about 100.
14. A superconducting tape comprising:
a substrate;
a biaxially-textured buffer layer overlying the substrate;
a superconducting film on the buffer layer; and
a silver layer deposited on the superconducting film, comprising:
an oxygenated first silver layer and a final silver layer, wherein the final silver layer is not oxygenated.
15. The tape of claim 14 , wherein the silver layer comprises less than about 20% of silver grains over about 1 μm in size.
16. A superconducting tape comprising:
a substrate;
a biaxially-textured buffer layer overlying the substrate;
a superconducting film on the buffer layer; and
a silver layer deposited on the superconducting film, comprising:
a first silver layer and a final silver layer,
wherein the final silver layer is not oxygenated; and
wherein the first silver layer comprises a porosity of less than about 1%.
17. A superconducting tape comprising:
a substrate;
a biaxially-textured buffer layer overlying the substrate;
a superconducting film on the buffer layer; and
a silver layer deposited on the superconducting film, comprising:
a first silver layer and a final silver layer,
wherein the final silver layer is not oxygenated; and
wherein the silver layer has a minimum Vickers micro-hardness value of about 100.