Composite monolithic low-loss superconductor for power transmission line

• US 4,103,075 A
• Filed: 10/28/1976
• Issued: 07/25/1978
• Est. Priority Date: 10/28/1976
• Status: Expired due to Term

• Current Assignee: Airco, Inc.
• Original Assignee: Airco, Inc.
• Inventors: Adam, Erik
• Primary Examiner(s): Rutledge, L. Dewayne
• Assistant Examiner(s): Lewis, Michael L.
• Application Number:
  US05/736,611
• Time in Patent Office: 635 Days
• Field of Search: 174/15 S, 174/126 S, 174/128 S, 428/610, 428/611, 428/614, 428/651, 428/660, 428/661, 428/662, 428/663, 428/664, 428/665, 428/668, 428/930, 428/941, 428/672, 428/673, 428/674, 428/685, 29/624
• US Class Current: 428/614
• CPC Class Codes: H01B 12/02 characterised by their form
• CPC Class Codes: H10N 60/20 Permanent superconducting devices
• CPC Class Codes: Y02E 40/60 Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
• CPC Class Codes: Y10S 174/13 High voltage cable, e.g. above 10kv, corona prevention
• CPC Class Codes: Y10S 174/32 having means for cooling
• CPC Class Codes: Y10S 174/33 Method of cable manufacture, assembly, repair, or splicing
• CPC Class Codes: Y10S 428/93 Electric superconducting
• CPC Class Codes: Y10S 505/812 Stock
• CPC Class Codes: Y10S 505/813 Wire, tape, or film
• CPC Class Codes: Y10T 428/12486 Laterally noncoextensive components [e.g., embedded, etc.]
• CPC Class Codes: Y10T 428/12743 Next to refractory [Group IVB, VB, or VIB] metal-base component
• CPC Class Codes: Y10T 428/12806 Refractory [Group IVB, VB, or VIB] metal-base component
• CPC Class Codes: Y10T 428/12812 Diverse refractory group metal-base components: alternative to or next to each other
• CPC Class Codes: Y10T 428/12819 Group VB metal-base component
• CPC Class Codes: Y10T 428/12826 Group VIB metal-base component
• CPC Class Codes: Y10T 428/12889 Au-base component
• CPC Class Codes: Y10T 428/12896 Ag-base component
• CPC Class Codes: Y10T 428/12979 Containing more than 10% nonferrous elements [e.g., high alloy, stainless]

Abstract

A composite superconductor having both filamentary and film conductors for carrying the pure and impure components of direct current, respectively, or for alternating current, is disclosed, together with a method of making it, and a preferred arrangement for its use in high power transmission lines.

Claims

1. A composite superconductive tape having:

(a) a rectangular central matrix element having a pair of wider faces and a pair of narrower faces when viewed in cross-section of a nonsuperconductive material in which are embedded a plurality of superconductive filaments;

(b) a pair of layers of superconductive material bonded to said wider pair of faces of said matrix;

(c) a pair of layers of a superconductive precursor material, selected such that it forms a superconductive compound when interreacted with the material of the matrix, bonded to said pair of layers of superconductive material;

(d) a second pair of layers of superconductive material bonded to said pair of layers of superconductor precursor material; and

(e) a pair of layers of a second nonsuperconductive material bonded to said second pair of layers of superconductive material.

2. The tape of claim 1 wherein the matrix material is a tin-bearing bronze and the superconductor precursor material is niobium.

3. The tape of claim 1 wherein the matrix material is a gallium-bearing bronze and the superconductor precursor material is vanadium.

4. The tape of claim 1 wherein said second nonsuperconducting material is selected from the group consisting of copper, aluminum, gold, silver, stainless steel, molybdenum and tungsten.

5. A composite superconductive tape having:

(a) a rectangular base matrix having a pair of wider faces and a pair of narrower faces when viewed in cross-section comprising a plurality of superconductive filaments embedded in a matrix of a normally conductive metal;

(b) a layer of a superconductive material bonded to one of the wider faces of said matrix;

(c) a layer of a superconductor precursor material bonded to said layer of superconductive material;

(d) a second layer of a superconductive material bonded to said layer of superconductor precursor material; and

(e) a layer of a material selected from the group consisting of copper, aluminum, gold, silver, stainless steel, molybdenum and tungsten bonded to said second layer of superconductive material.

6. The tape of claim 5 wherein the superconductive filaments are layers of niobium stannide formed around cores of niobium and the matrix is a tin-bearing bronze.

7. The tape of claim 5 wherein the superconductive filaments are layers of vanadium gallide (V₃ Ga) formed around cores of vanadium and the matrix is a gallium-bearing bronze.

8. The tape of claim 5 wherein the superconducting filaments are made of the alloys of niobium and titanium and the matrix material is selected from the group consisting of copper, aluminum, silver and gold.

9. The tape of claim 5 wherein the layers of superconductive material are of the alloys of niobium and titanium.

10. The tape of claim 5 wherein the superconducting filaments are of niobium.

11. A composite superconductive tape having:

(a) a rectangular matrix having a pair of wider faces and a pair of narrower faces when viewed in cross-section comprising a plurality of superconductive filaments embedded in a matrix of normally conductive material; and

(b) at least one layer of superconductive material bonded to each of the wider pair of faces of said rectangular matrix.

12. The tape of claim 11 wherein the outermost layers have layers of a material selected from the group consisting of gold, silver, copper, aluminum, stainless steel, molybdenum, and tungsten bonded to their faces opposite to their faces which are in contact with the matrix material.

13. The tape of claim 11 wherein the superconductive filaments are layers formed around filaments of a material which when interreacted with the material of the matrix forms a superconducting compound.

14. The tape of claim 11 wherein the superconductive filaments are formed from the alloys of niobium and titanium and the matrix is of a material chosen from the group consisting of aluminum, copper, silver, gold, stainless steel, molybdenum and tungsten.