Title :
Silver encased high temperature superconductor ribbons produced by rolling
Author :
Whitlow, G.A. ; Iyer, N.C. ; Male, A.T. ; Powell, J.C. ; Wagner, G.R.
Author_Institution :
Westinghouse Res. & Dev. Center, Pittsburgh, PA, USA
fDate :
3/1/1989 12:00:00 AM
Abstract :
Ribbons of silver/yttrium-barium-copper oxide/silver (Ag/YBCO/Ag), nominally 0.01 in. (0.25 mm) thick, have been fabricated by unidirectional rolling and their resulting microstructures and superconducting properties evaluated. The influence of a postfabrication sinter/oxygen replenishment anneal on their properties has been determined. Grain alignment/preferred orientation of the YBCO core was observed. Typical transport critical-current densities measured in zero field at 4.2 and 77 K were 600 and 125 A/cm2, respectively. Preliminary experiments on the bismuth-containing high-temperature superconductors have indicated that codeformation of a silver composite billet by rolling to thin strip is easily accomplished
Keywords :
annealing; barium compounds; ceramics; cold rolling; critical current density (superconductivity); crystal microstructure; high-temperature superconductors; silver; yttrium compounds; 4.2 K; 77 K; Ag encapsulation; YBa2Cu3O7-Ag; grain alignment; high temperature superconductor ribbons; high temperature superconductors; microstructures; postfabrication sinter/oxygen replenishment anneal; rolling; superconducting properties; transport critical-current densities; unidirectional rolling; Annealing; Bismuth; Conducting materials; Conductors; Current density; Fabrication; High temperature superconductors; Silver; Solenoids; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
