Penny, M., Beduz, C., Yang, Y., Al Mosawi, M., Scurlock, R.G. and Wroe, R.
Effects of the time sequence of the cold-rolling on the processing time of Ag-sheathed (Bi, Pb)2Sr2Ca2Cu3Ox tapes
Physica C: Superconductivity And its Applications, 262, (1-2), . (doi:10.1016/0921-4534(96)00198-0).
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The effect of the time sequence of cold working/sintering on the transport Jc has been studied. The results on the variation of Jc with sintering time between the first and second intermediate cold rolling, ts2, are presented. We have found that Jc peaks sharply at an optimum ts2. For example, tapes with a total sintering time of 140 h reach an optimum Jc of 2.1 × 104 A cm?2 (77 K, self-field) at ts2 = 27 h. In general, there is a narrow window of optimisation in ts2ts2; in this examples, Jc drops by 50% within 7 h of the optimised value. We also found that the optimum total singering time (ttot) for a tape increases gradually with ts2e.g. ttot < 90 h for ts2 = 22 h and ttot > 180 h for ts2 = 35 h. X-ray diffraction analysis (XRD) was used to correlate the phase conversion prior to the second intermediate rolling with the Jc. The results suggest that the total processing time can be adjusted by ts2. This has important consequences on reducing the long processing time of BSCCO tapes.
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