Effects of the time sequence of the cold-rolling on the processing time of Ag-sheathed (Bi, Pb)₂Sr₂Ca₂Cu₃O_x tapes

Penny, M., Beduz, C., Yang, Y., Al Mosawi, M., Scurlock, R.G. and Wroe, R. (1996) Effects of the time sequence of the cold-rolling on the processing time of Ag-sheathed (Bi, Pb)₂Sr₂Ca₂Cu₃O_x tapes. Physica C: Superconductivity and its Applications, 262 (1-2), 63-67. (doi:10.1016/0921-4534(96)00198-0).

Abstract

The effect of the time sequence of cold working/sintering on the transport J_c has been studied. The results on the variation of J_c with sintering time between the first and second intermediate cold rolling, t_s2, are presented. We have found that J_c peaks sharply at an optimum t_s2. For example, tapes with a total sintering time of 140 h reach an optimum J_c of 2.1×10⁴ A cm^-2 (77 K, self-field) at t_s2 = 27 h. In general, there is a narrow window of optimisation in t_s2t_s2; in this examples, J_c drops by 50% within 7 h of the optimised value. We also found that the optimum total sintering time (t_tot) for a tape increases gradually with t_s2 e.g. t_tot < 90 h for t_s2 = 22 h and t_tot > 180 h for t_s2 = 35 h. X-ray diffraction analysis (XRD) was used to correlate the phase conversion prior to the second intermediate rolling with the J_c. The results suggest that the total processing time can be adjusted by t_s2. This has important consequences on reducing the long processing time of BSCCO tapes.

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Contributors

Author: Y. Yang

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