Fabrication of high current carrying Bi-2212/Ag superconducting tapes by the preannealing and cold rolling process

摘要

The pre-annealing and rolling process is employed to improve the microstructure and J(c) for Bi-2212/Ag tapes fabricated by using the dip-coating method and melt-solidification process. It is found that J(c) has been enhanced significantly in tapes processed by the combination of pre-annealing at 800-880 degrees C and cold rolling at the deformation rate of 20-30%. The increase of J(c) is assigned to the enhancement of c-axis grain alignment and the uniformity of the Bi-2212 layer that brings about the improvement of grain coupling. This method is promising for fabricating long BSCCO tapes with homogeneous and high transport J(c). (C) 1998 Published by Elsevier Science Ltd. All rights reserved. [References: 3]