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Superconducting joints between Bi-2223 tapes were fabricated by a hot-pressing process with a 24 h heat treatment. We developed specialized equipment to apply pressure to the joint during the heat treatment. Hot pressing is effective for producing practical critical current even by the short heat treatment. The superconducting joint in a closed-loop showed a resistance of 7.3 × 10 −15 Ω at 4.2 K in self-field. The maximum persistent current that could flow in the loop was estimated to be about 170 A at 4.2 K. The purification and further densification of the intermediate layer in the superconducting joint are issues that need to be addressed. Once these issues are addressed, the hot-pressing process should be a promising method for fabricating high-performance Bi-2223 superconducting joints in high yields within a short processing time.

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Keyword: Superconducting joint

Date published: 2023-03-02

Publisher: Institute of Electrical and Electronics Engineers (IEEE)

Journal:

• IEEE Transactions on Applied Superconductivity (ISSN: 10518223) vol. 33 issue. 5 p. 1-7 6400207

Funding:

• JST-Mirai Program JPMJMI17A2
• JSPS KAKENHI JP22K14482

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4468

First published URL: https://doi.org/10.1109/tasc.2023.3251299

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Updated at: 2025-03-02 12:30:11 +0900

Published on MDR: 2025-03-02 12:30:12 +0900