Microstructure and electrical properties of BSCCO tapes withceramic barriers

摘要

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