Abstract
To reduce the cost of Bi-2223 superconducting tapes, we prepared Bi-2223 tapes by the powder-in-tube process using a bimetallic sheath consisting of Ag and Ni. Ag was in contact with the superconducting ceramic core and acted as a protective layer against reaction between the external Ni sheath and the internal superconducting core. We remove Ni on one edge of the tape in order to provide a path for oxygen diffusion. After two step heat treatments, the critical current density of sample is 9307Acm−2. SEM photographs and XRD results show that there are some Bi-2212 phase in samples conducted two step heat treatments. It is suggested that the heat treatment process should be optimized in the future research in order to decrease the thickness of NiO layer, to reduce the fraction of Bi-2212 phase, and to improve superconducting performance of Bi-2223/Ag/Ni tape.
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