Improvement of Jc and Grain Alignment of Bi-2212/Ag Multilayer Tapes by Pre-Annealing and Intermediate Rolling Process |
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| Authors: | Hitoshi Kitaguchi Hanping Miao Hiroaki Kumakura Kazumasa Togano Takayo Hasegawa Tsutomu Koizumi |
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| Affiliation: | (1) National Research Institute for Metals, Tsukuba, 305-0047, Japan;(2) CREST, Japan Science and Technology Corporation, Tsukuba, 305-0047, Japan;(3) Showa Electric Wire & Cable Co. Ltd., Kawasak, 210-0843i, Japan |
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| Abstract: | The high transport critical current density (J
c
) > 500 kA/cm
2
at 4.2 K, 10 T is obtained in the Bi-2212/Ag multilayer tapes fabricated by using PAIR (Pre-Annealing and Intermediate Rolling) and melt-solidification process. This J
c
value is twice higher than existing high-quality Bi-2212/Ag tapes (250 kA/cm
2
). By applying PAIR process to Bi-2212/Ag tapes, Bi-2212 grain alignment is much improved and a large J
c
enhancement is achieved. J
c
has been increased strongly by performing pre-annealing at 840°C in oxygen (1 atm) and intermediate rolling with 25% deformation. |
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| Keywords: | |
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