Microstructure and electromagnetic properties of Bi-2223 Ag alloy sheathed tapes prepared by a controlled melting process

The Bi-2223 superconducting tapes with the sheath of Ag- Au-Al and Ag-Au-Mg alloys were fabricated by the controlled melting (CM) process. The CM process is effective for eliminating weak links and improving the transport properties of Bi-2223 Ag alloy sheathed tapes. In the CM process, part of Bi-2...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2000-07, Vol.337 (1-4), p.165-168
Main Authors: Hua, Ling, Yoo, Jaimoo, Kim, Haidoo, Chung, Hyungsik, Qiao, Guiwen, Yuan, Guansen
Format: Article
Language:English
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Summary:The Bi-2223 superconducting tapes with the sheath of Ag- Au-Al and Ag-Au-Mg alloys were fabricated by the controlled melting (CM) process. The CM process is effective for eliminating weak links and improving the transport properties of Bi-2223 Ag alloy sheathed tapes. In the CM process, part of Bi-2223 is decomposed to Bi-2212 and nonsuperconducting phases because of a short time melting, and then can be recovered in the subsequent press-sinter cycles. In the fully CM-processed tapes, finely dispersed Bi-2212 and secondary phase particles in well-aligned Bi-2223 matrix can be observed. Meanwhile, the improved magnetic field dependence of magnetization and transport Jc has been achieved through the CM process. The compressive stress in the Ag alloy/oxide interface induced by the fast cooling is decreased due to the low thermal conductivity of Ag alloy sheath. There is no microcracking observed at the interface of the fast-cooled sample. 8 refs.
ISSN:0921-4534
DOI:10.1016/S0921-4534(00)00080-0