Abstract
Abstract The microstructure and superconducting properties of Bi-2223/Ag tapes fabricated in the two-step sintering process were investigated. The tapes were then subjected to two heat treatments with an intermediate rolling. All the tapes were sintered at 835 °C for 24 h at initial sintering stage. A two-step sintering procedure was then used in the final sintering stage. In the first step, the tapes are sintered at 840–865 °C for 1 h. In the second step, they were sintered at 835 °C for 120 h. The results show that the first step sintering temperature has significant influence on the microstructure and the critical current density J c . The observed microstructures are consistent well with the different J c performances of the tapes first-step-sintered at different temperatures. The tape first-step-sintered at 850 °C, which has small secondary phases, stronger c -axis grain alignment, higher proportion of Bi-2223 phase, and no cracks, exhibits the highest J c value.
Published Version
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