Thermomechanical means to improve the critical current density of BSCCO tapes
Abstract
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 providemore »
- Inventors:
-
- Hinsdale, IL
- Glen Ellyn, IL
- Latham, NY
- Waterbury, CT
- Issue Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- OSTI Identifier:
- 873767
- Patent Number(s):
- 6240619
- Assignee:
- University of Chicago (Chicago, IL)
- Patent Classifications (CPCs):
-
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
H - ELECTRICITY H01 - BASIC ELECTRIC ELEMENTS H01L - SEMICONDUCTOR DEVICES
- DOE Contract Number:
- W-31109-ENG-38
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- thermomechanical; means; improve; critical; current; density; bscco; tapes; method; preparing; wires; including; bi-2223; superconductor; material; providing; oxide; carbonate; sources; sr; cu; pb; milling; time; exceed; 30; minutes; preferably; 20; produce; homogeneous; mixture; heat; treating; calcining; milled; temperature; 830; degree; 12; hours; followed; additional; treatment; powder; average; diameter; micron; range; silver; alloy; tube; filled; shape; formed; rectangular; tape; alternately; thermally; mechanically; heating; elevated; 835; 840; reducing; repeating; thermal; mechanical; held; total; 48; 350; provide; 10; 11; additional heat; current density; elevated temperature; heat treatment; critical current; oxide powder; heat treating; homogeneous mixture; superconductor material; mechanical means; thermally treating; tube filled; average diameter; alloy tube; silver alloy; micron range; filled tube; mechanical treatment; bscco tapes; /29/174/505/
Citation Formats
Balachandran, Uthamalingam, Poeppel, Roger, Haldar, Pradeep, and Motowidlo, Leszek. Thermomechanical means to improve the critical current density of BSCCO tapes. United States: N. p., 2001.
Web.
Balachandran, Uthamalingam, Poeppel, Roger, Haldar, Pradeep, & Motowidlo, Leszek. Thermomechanical means to improve the critical current density of BSCCO tapes. United States.
Balachandran, Uthamalingam, Poeppel, Roger, Haldar, Pradeep, and Motowidlo, Leszek. Mon .
"Thermomechanical means to improve the critical current density of BSCCO tapes". United States. https://www.osti.gov/servlets/purl/873767.
@article{osti_873767,
title = {Thermomechanical means to improve the critical current density of BSCCO tapes},
author = {Balachandran, Uthamalingam and Poeppel, Roger and Haldar, Pradeep and Motowidlo, Leszek},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}
Works referenced in this record:
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
- Yamada, Y.; Obst, B.; Flukiger, R.
- Superconductor Science and Technology, Vol. 4, Issue 4
Reaction Mechanism of High- T c Phase ( T c =110 K) Formation in the Bi-Sr-Ca-Cu-O Superconductive System
journal, November 1989
- Tsuchiya, Jun; Endo, Hozumi; Kijima, Naoto
- Japanese Journal of Applied Physics, Vol. 28, Issue Part 2, No. 11