Title :
Development of Tl-1223 conductors for 77 K HTS applications
Author :
Selvamanickam, V. ; Pfaffenbach, K. ; Kirchoff, D. ; Cardner, K.M. ; Hazelton, D.W. ; Haldar, P.
Author_Institution :
Intermagnetic General Corp., NY, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
Tl-1223 conductors have been fabricated by the powder-in-tube (PIT) and surface-coated conductor (thick film) techniques. Current densities (J/sub c/) of 20,000 A/cm/sup 2/ and 12,000 A/cm/sup 2/ have been achieved at 77 K in short monofilament tapes and meter-long 37-filament tapes respectively. A large diameter test pancake coil was successfully fabricated with 17 m long PIT tapes. A new process has been developed to achieve grain alignment in PIT Tl-1223. Critical currents of 18 A and a J/sub c/ of 19000 A/cm/sup 2/ has been achieved at 77 K in surface-coated Tl-1223 conductor fabricated by an industrial process.
Keywords :
barium compounds; bismuth compounds; calcium compounds; critical current density (superconductivity); critical currents; crystal microstructure; high-temperature superconductors; lead compounds; multifilamentary superconductors; powder technology; strontium compounds; superconducting coils; superconducting tapes; thallium compounds; 1 m; 17 m; 18 A; 37-filament tapes; 77 K; HTS applications; PIT Tl-1223; Tl-1223 conductors; TlPbBi(SrBa)/sub 2/Ca/sub 2/Cu/sub 3/O; critical currents; current densities; grain alignment; large diameter test pancake coil; powder-in-tube technique; short monofilament tapes; surface-coated Tl-1223 conductor; surface-coated conductor thick film technique; Coils; Conductive films; Conductors; Critical current; Critical current density; Current density; High temperature superconductors; Superconducting transition temperature; Testing; Thick films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
