Influence of partial oxygen pressure on the processing of Ag-sheathed BSCCO-2223 tapes

Penny, M., Feltham, S., Beduz, C., Yang, Y., Scurlock, R. and Wroe, R. (1997) Influence of partial oxygen pressure on the processing of Ag-sheathed BSCCO-2223 tapes. Cryogenics, 37 (10), 601-604. (doi:10.1016/S0011-2275(97)00060-X).

Abstract

The effect of sintering in various oxygen atmospheres on transport Jc has been investigated. The results of the peak Jc with total sintering time are presented for each partial oxygen pressure (PO2 = 0.04, 0.075, 0.21). Two important processing parameters of tapes were adjusted to ensure a fair comparison of each PO2. Firstly, as the melting temperature of BSCCO decreases with decreasing PO2, it was necessary to alter the sintering temperatures to maintain the same subcooling for each PO2. Secondly, the first and second intermediate rollings of the tapes were performed when there were equal amounts of 2223 phase. The peaks in Jc against total sintering time occurred at 200 h for PO2 = 0.21, 45 h for PO2 = 0.075, and 90 h for PO2 = 0.04. This relates to the stability range and the incubation time of BSCCO-2223 in PO2 and could be an important tool to reduce the long processing time of optimized tapes.

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