Title :
Preparation of dispersion-hardened single- and multifilamentary Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ tapes and wires
Author :
Kessler, J. ; Boutemy, S. ; Chen, S. ; Dimapilis, D. ; Miller, V. ; Wei, W. ; Schwartz, J.
Author_Institution :
Nat. High Magnetic Field Lab., Florida State Univ., Tallahassee, FL, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
The impact of oxide dispersion-hardening on the mechanical behavior of powder-in-tube Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ tapes is investigated. Single-core tapes and multifilamentary tapes with 19 filaments were prepared from commercially available AgMg tubes and powder. The cold-working process was monitored by observing sample microstructures at intermediate stages. The deformation process was optimized to eliminate bridging in the multifilamentary conductor. Short samples were heat-treated and characterized by critical current measurements (I/sub c/) at 4.2 K and 0 T. The maximum filament critical current density (J/sub c/) obtained was 115,000 A/cm/sup 2/ corresponding to an engineering critical current density (J/sub c/) of 22,000 A/cm/sup 2/.
Keywords :
annealing; bismuth compounds; calcium compounds; ceramics; cold working; critical current density (superconductivity); critical currents; crystal microstructure; dispersion hardening; high-temperature superconductors; multifilamentary superconductors; powder technology; strontium compounds; superconducting tapes; 0 T; 19 filaments; 4.2 K; AgMg; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O; bridging elimination; cold-working process; critical current measurements; deformation process; engineering critical current density; heat-treatment; intermediate stages; maximum filament critical current density; mechanical behavior; multifilamentary conductor; multifilamentary tapes; oxide dispersion-hardening; powder-in-tube Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ tapes; sample microstructures; short samples; single-core tapes; wires; Bismuth; Conductors; Critical current; Critical current density; Density measurement; Heat engines; Microstructure; Monitoring; Powders; Strontium;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
