Title :
Fabrication and properties of high-T/sub c/ tapes and coils made from silver-clad Bi-2223 superconductors
Author :
Haldar, P. ; Hoehn, J.G., Jr. ; Rice, J.A. ; Motowidlo, L.R. ; Balachandran, U. ; Youngdahl, C.A. ; Tkaczyk, J.E. ; Bednarczyk, P.J.
Author_Institution :
Intermagnetics General Corp., Guilderland, NY, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
Long lengths of flexible silver-cell Bi-2223 high-T/sub c/ (critical temperature) superconductors have been fabricated by the powder-in-tube technique. By improving process conditions DC transport measurement at liquid helium (4.2 K) and hydrogen (20 K) temperatures yield J/sub c/´s (critical current densities) greater than 10/sup 5/ A/cm/sup 2/ at zero field and exceed 3*10/sup 4/ A/cm/sup 2/ at liquid nitrogen (77 K) temperature in short tape samples. Detailed microstructural analysis and J/sub c/ measurements with applied fields up to 20 T are reported. Coils have been fabricated from 1-m lengths of conductor with J/sub c/´s at 77 K approaching 10/sup 4/ A/cm/sup 2/. Measurements on small pancake coils made from 10-m tapes are also reported.<>
Keywords :
bismuth compounds; calcium compounds; ceramics; claddings; critical current density (superconductivity); crystal microstructure; high-temperature superconductors; lead compounds; powder technology; silver; strontium compounds; superconducting magnets; Ag-(BiPb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/; HTSC; coils; critical current densities; high-T/sub c/ tapes; microstructural analysis; powder-in-tube technique; Coils; Critical current density; Current measurement; Density measurement; Fabrication; Hydrogen; Nitrogen; Superconductivity; Temperature;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
