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Torsional texturing of superconducting oxide composite articles

Patent ·
OSTI ID:874298
 [1];  [2]
  1. Grafton, MA
  2. Bolton, MA
+ Show Author Affiliations
A method of texturing a multifilamentary article having filaments comprising a desired oxide superconductor or its precursors by torsionally deforming the article is provided. The texturing is induced by applying a torsional strain which is at least about 0.3 and preferably at least about 0.6 at the surface of the article, but less than the strain which would cause failure of the composite. High performance multifilamentary superconducting composite articles having a plurality of low aspect ratio, twisted filaments with substantially uniform twist pitches in the range of about 1.00 inch to 0.01 inch (25 to 0.25 mm), each comprising a textured desired superconducting oxide material, may be obtained using this texturing method. If tighter twist pitches are desired, the article may be heat treated or annealed and the strain repeated as many times as necessary to obtain the desired twist pitch. It is preferred that the total strain applied per step should be sufficient to provide a twist pitch tighter than 5 times the diameter of the article, and twist pitches in the range of 1 to 5 times the diameter of the article are most preferred. The process may be used to make a high performance multifilamentary superconducting article, having a plurality of twisted filaments, wherein the degree of texturing varies substantially in proportion to the radial distance from the center of the article cross-section, and is substantially radially homogeneous at any given cross-section of the article. Round wires and other low aspect ratio multifilamentary articles are preferred forms. The invention is not dependent on the melting characteristics of the desired superconducting oxide. Desired oxide superconductors or precursors with micaceous or semi-micaceous structures are preferred. When used in connection with desired superconducting oxides which melt irreversibly, it provides multifilamentary articles that exhibit high DC performance characteristics and AC performance markedly superior to any currently available for these materials. In a preferred embodiment, the desired superconducting oxide material is BSCCO 2223.
Research Organization:
LOCKHEED MARTIN ENRGY SYST INC
DOE Contract Number:
AC05-84OR21400
Assignee:
American Superconductor Corp. (Westborough, MA)
Patent Number(s):
US 6360425
OSTI ID:
874298
Country of Publication:
United States
Language:
English

References (8)

Dependence of critical current density on filament diameter in round multifilament Ag‐sheathed Bi 2 Sr 2 CaCu 2 O x wires processed in O 2 journal November 1994
Effect of thermomechanical treatment on the critical current density of Ag-sheathed B(Pb)SCCO tapes journal March 1990
Preparation of the textured Bi-based oxide tapes by partial melting process journal March 1991
Dependence of the Angular Anisotropy of the Critical Current Density on Texture in Silver-Sheathed Bi-2223 Tapes book January 1994
Critical issues in the OPIT processing of high-Jc BSCCO superconductors journal March 1991
Textured BSCCO/Ag superconducting microcomposites with improved critical current density through mechanical deformation journal May 1992
Influence of thermomechanical treatment on critical currents in Ag-sheathed BSCCO-2223 tapes journal January 1992
Development of technical high-T/sub c/ superconductor wires and tapes journal March 1993

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