Development of high-T
c superconducting Bi-2223 tape joints |
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Authors: | K Chen C H Tai L Horng |
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Affiliation: | 1. Materials Research Laboratories, Industrial Technology Research Institute, Chutung, Hsinchu, Taiwan 310, ROC 2. Department of Physics, National Chang-Hua University of Education, Changhua, Taiwan
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Abstract: | High-T c superconducting joints between Ag-clad Bi-2223 tapes have been developed for persistent current applications. Two presintered tapes with one side of the silver stripped were lapped and then wrapped by a silver foil. The complex was uniaxially pressed followed by appropriate sintering to form a high-T c superconducting tape joint. It was found that the ratio of critical currents through the joint to that of the tape,I cj/Ic, depended on the uniaxial pressure and the sintering conduction. At liquid-nitrogen temperature 77 K,I cj/Ic=99% has been achieved. Persistent current loops formed by Bi-2223 tapes have also been fabricated and tested. Joint resistance of a loop was determined to be ~4×10?13 Ω between the decay time of 120 and 3600 sec. |
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