Role of processing in improving the critical current of Ag/BPSCCO tapes |
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Authors: | S R Shukla Y S Reddy D K Pandya Y Tanaka R G Sharma |
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Institution: | (1) National Physical Laboratory, 110 012 New Delhi, India;(2) Indian Institute of Technology, 110016 Delhi, India;(3) National Research Institute for Metals, Tsukuba Shi, Japan |
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Abstract: | Silver-clad tapes of highT
c Bi-Pb-Sr-Ca-Cu-O superconductors have been fabricated through the powder-in-tube method. The critical current density, J
c
, of a thick tape was 534 A.cm−2 (77 K, 0 T). Subsequent rolling and sintering of the tapes led to a gradual decrease inJ
c, instead of the expected increase. This was caused by the microcracks developed in the core material by a rather drastic
reduction during the rolling of the tapes. A modified and well controlled rolling technique, on the other hand, resulted in
much improvedJ
c values. Repeated rolling and sintering resulted in a good grain alignment and no microcracks were observed. In the present
studies, maximumJ
c of 1846 A.cm−2 (77 K, 0 T) and 2.43 × 104 A.cm−2 (4.2 K, 0 T) have been obtained Optimization of the processing and sintering parameters are expected to lead to still higherJ
c values. |
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Keywords: | Critical current density silver-clad tapes sintering BPSCCO system |
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