Title :
Microstructure and electrical properties of BSCCO tapes with ceramic barriers
Author :
Hassler, W. ; Schubert, M. ; Rodig, C. ; Haas, V. ; Leghissa, M. ; Berthold, Th.
Author_Institution :
IFW Dresden, Germany
fDate :
3/1/2001 12:00:00 AM
Abstract :
The AC-losses in multifilamentary tapes can be reduced mainly by insulating barriers and/or by twisting. We prepared multifilamentary Bi-2223/Ag tapes with the PIT process using monofilaments dip-coated with a ceramic barrier (BaZrO3, YSZ, CeO2). All tapes with ceramic barriers showed, besides lower losses, a degradation of the critical current density due to interactions between the barrier material and the BSCCO-filaments during heat treatment. Furthermore, we studied the influence of the twist pitch on the AC-losses and the critical current density of twisted tapes without barriers. Microstructural investigations showed a partial damaging of the inner filaments during flat rolling
Keywords :
bismuth compounds; critical current density (superconductivity); crystal microstructure; heat treatment; high-temperature superconductors; losses; multifilamentary superconductors; rolling; strontium compounds; superconducting tapes; AC-losses; BaZrO3; Bi2Sr2Ca2Cu3O8 -Ag; Bi2Sr2Ca2Cu3O8 /Ag; CeO2; PIT process; Y2O3ZrO2; YSZ; barrier-filament interactions; ceramic barriers; critical current density degradation; electrical properties; flat rolling; heat treatment; inner filament damage; insulating barriers; microstructure; multifilamentary tapes; twist pitch; twisted tapes; Atmospheric measurements; Bismuth compounds; Ceramics; Conductivity; Critical current density; Insulation; Microstructure; Powders; Slurries; Wire drawing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
