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Title: Improved superconducting magnet wire

Abstract

This invention is directed to a superconducting tape or wire composed of alternating layers of copper and a niobium-containing superconductor such as niobium of NbTi, Nb/sub 3/Sn or Nb/sub 3/Ge. In general, each layer of the niobium-containing superconductor has a thickness in the range of about 0.05 to 1.5 times its coherence length (which for Nb/sub 3/Si is 41 A) with each copper layer having a thickness in the range of about 170 to 600 A. With the use of very thin layers of the niobium composition having a thickness within the desired range, the critical field (H/sub c/) may be increased by factors of 2 to 4. Also, the thin layers of the superconductor permit the resulting tape or wire to exhibit suitable ductility for winding on a magnet core. These compositions are also characterized by relatively high values of critical temperature and therefore will exhibit a combination of useful properties as superconductors.

Inventors:
;
Publication Date:
OSTI Identifier:
7183238
Application Number:
ON: DE84011233
Assignee:
Dept. of Energy ERA-09-030045; EDB-84-097654
DOE Contract Number:
W-31-109-ENG-38
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; SUPERCONDUCTING CABLES; PATENTS; COPPER; DUCTILITY; GERMANIUM ALLOYS; LAYERS; NIOBIUM ALLOYS; SUPERCONDUCTORS; THICKNESS; TIN ALLOYS; TITANIUM ALLOYS; ALLOYS; CABLES; CONDUCTOR DEVICES; DIMENSIONS; DOCUMENT TYPES; ELECTRIC CABLES; ELECTRICAL EQUIPMENT; ELEMENTS; EQUIPMENT; MECHANICAL PROPERTIES; METALS; TENSILE PROPERTIES; TRANSITION ELEMENTS; 700202* - Fusion Power Plant Technology- Magnet Coils & Fields; 420201 - Engineering- Cryogenic Equipment & Devices

Citation Formats

Schuller, I.K., and Ketterson, J.B.. Improved superconducting magnet wire. United States: N. p., 1983. Web.
Schuller, I.K., & Ketterson, J.B.. Improved superconducting magnet wire. United States.
Schuller, I.K., and Ketterson, J.B.. 1983. "Improved superconducting magnet wire". United States. doi:.
@article{osti_7183238,
title = {Improved superconducting magnet wire},
author = {Schuller, I.K. and Ketterson, J.B.},
abstractNote = {This invention is directed to a superconducting tape or wire composed of alternating layers of copper and a niobium-containing superconductor such as niobium of NbTi, Nb/sub 3/Sn or Nb/sub 3/Ge. In general, each layer of the niobium-containing superconductor has a thickness in the range of about 0.05 to 1.5 times its coherence length (which for Nb/sub 3/Si is 41 A) with each copper layer having a thickness in the range of about 170 to 600 A. With the use of very thin layers of the niobium composition having a thickness within the desired range, the critical field (H/sub c/) may be increased by factors of 2 to 4. Also, the thin layers of the superconductor permit the resulting tape or wire to exhibit suitable ductility for winding on a magnet core. These compositions are also characterized by relatively high values of critical temperature and therefore will exhibit a combination of useful properties as superconductors.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1983,
month = 8
}
  • A superconducting tape or wire with an improved critical field is formed of alternating layers of a niobium-containing superconductor such as Nb, NbTi, Nb.sub.3 Sn or Nb.sub.3 Ge with a thickness in the range of about 0.5-1.5 times its coherence length, supported and separated by layers of copper with each copper layer having a thickness in the range of about 170-600 .ANG..
  • This patent describes a superconducting metallic tape consisting of at least 100 alternating layers of a niobium-containing superconductor and copper, with each layer having a thickness in the range of 0.5-1.5 times the coherence length for the superconducting composition and each copper layer thickness in the range of 170-600 Angstroms.
  • An improved method of preparing composite multifilament superconducting wire of Nb/sub 3/Sn in a copper matrix eliminates the necessity of coating the drawn wire with tin. A generalized cylindrical billet of an alloy of copper containing at least 15 weight percent niobium, present in the copper as discrete, randomly distributed and oriented dendritic-shaped particles, is provided with at least one longitudinal opening which is filled with tin to form a composite drawing rod. The drawing rod is then drawn to form a ductile composite multifilament wire containing a filament of tin. The ductile wire containing the tin can then bemore » wound into magnet coils or other devices before heating to diffuse the tin through the wire to react with the niobium forming Nb/sub 3/Sn. Also described is an improved method for making large billets of the copper-niobium alloy by consumable-arc casting.« less
  • A superconducting wire comprising a superconducting filament and a beryllium strengthened bronze matrix in which the addition of beryllium to the matrix permits a low volume matrix to exhibit reduced elastic deformation after heat treating which increases the compression of the superconducting filament on cooling and thereby improve the strain characteristics of the wire.
  • A superconducting wire comprising a superconducting filament and a beryllium strengthened bronze matrix in which the addition of beryllium to the matrix permits a low volume matrix to exhibit reduced elastic deformation after heat treating which increases the compression of the superconducting filament on cooling and thereby improves the strain characteristics of the wire.