Title :
Progress towards a long length metallic precursor process for multifilament Bi-2223 composite superconductors
Author :
Otto, A. ; Masur, L.J. ; Craven, C. ; Daly, D. ; Podtburg, E.R. ; Schreiber, J.
Author_Institution :
American Supercond. Corp., Westborough, MA, USA
fDate :
6/1/1995 12:00:00 AM
Abstract :
A process based on metal precursors has been developed for fabricating 361-filament Bi-2223 oxide superconductor-silver composite tapes with oxide and whole wire critical current densities of 20.8 kA/cm/sup 2/ and 3.74 kA/cm/sup 2/ at 77 K over 85 m (1 /spl mu/V/cm criterion). Fabrication of approximately 50 m lengths for a cumulative 1 km yielded average oxide critical current densities of 15.2 kA/cm/sup 2/ and 11.9 kA/cm/sup 2/ using 1 /spl mu/V/cm and 10/sup -11/ /spl Omega/ cm criteria. Within tape I/sub c/ variability was less than 5% except for I/sub c/ drop-offs near the tape ends. The oxide superconductor exhibited a high degree of the required texture. A 1.12 T (at 4.2 K) instrumented magnet with a 2.5 cm bore was fabricated by a react- and-wind approach from the tapes and delivered to Oak Ridge National Laboratory for quench studies.<>
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); high-temperature superconductors; multifilamentary superconductors; powder technology; silver; strontium compounds; superconducting magnets; superconducting tapes; texture; 77 K; Bi/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O-Ag; composite tapes; critical current density; high temperature superconductor; long length metallic precursor process; magnet fabrication; multifilament composite superconductors; texture; Boring; Critical current density; Fabrication; High temperature superconductors; Instruments; Multifilamentary superconductors; Superconducting filaments and wires; Superconducting films; Superconducting magnets; Superconductivity;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
