Reactive Sintering and Retrograde Densification of Bulk Bismuth-Based Superconductors |
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| Authors: | Ryan L Thayer Sarah R Schmidt Stephen E Dorris Jeffrey W Bullard Michael T Lanagan ‡ |
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| Affiliation: | Energy Technology Division, Argonne National Laboratory, Argonne, Illinois 60439-4838;Department of Materials Science and Engineering University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 |
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| Abstract: | Densification was observed when bulk ceramic superconductors with a composition of Bi1.8Pb0.4Sr2Ca2Cu3O10+δ were sintered for short times (<4 h) near the incongruent melting temperature. The initial shrinkage of the powder compacts was correlated with the existence of a transient liquid phase. Retrograde densification, which is a decrease in density, occurred for longer sintering times and was attributed to changes in pore structure. The results provide direction for future processing of bulk bismuth-based superconductors and powder-in-tube tapes for the fabrication of long-length wire. |
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| Keywords: | superconductors sinter/sintering bismuth strontium calcium copper oxide |
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