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Thermomechanical means to improve the critical current density of BSCCO tapes

Patent ·
OSTI ID:873767
 [1];  [2];  [3];  [4]
  1. Hinsdale, IL
  2. Glen Ellyn, IL
  3. Latham, NY
  4. Waterbury, CT
+ Show Author Affiliations

A method of preparing wires or tapes including Bi-2223 superconductor material by providing oxide and carbonate sources of Bi, Sr, Ca, Cu and Pb, milling the material for a time not to exceed about 30 minutes but preferably not greater than 20 minutes to produce a homogeneous mixture. Then heat treating by calcining the milled mixture at a temperature of at least about 830.degree. C. for a time not less than about 12 hours, followed by at least one additional milling for a time not to exceed about 20 minutes and one additional heat treatment, to produce an oxide powder having an average diameter in the 4 to 5 micron range. Then a silver or silver alloy tube is filled with the oxide powder, and shape formed into a rectangular tape. Then alternately thermally treating and mechanically working the tube filled with oxide powder by heating the filled tube to an elevated temperature of about 835.degree. C. to 840.degree. C. and reducing the diameter of the tube, repeating the thermal and mechanical treatment. The filled tube is held at the elevated temperature for a total time in the range of from about 48 hours to about 350 hours to provide Pb.sub.0.4, Bi.sub.1.8 Sr.sub.2.0 Ca.sub.2.2 Cu.sub.3 O.sub.x where x is between 10 and 11.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL
DOE Contract Number:
W-31109-ENG-38
Assignee:
University of Chicago (Chicago, IL)
Patent Number(s):
US 6240619
OSTI ID:
873767
Country of Publication:
United States
Language:
English

References (2)

Microstructural study of Bi(2223)/Ag tapes with J c (77 K, 0 T) values of up to 3.3*10 4 A cm -2 journal April 1991
Reaction Mechanism of High- T c Phase ( T c =110 K) Formation in the Bi-Sr-Ca-Cu-O Superconductive System journal November 1989

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