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(abstract)This paper reviews the Pb- and Cd-free NbTi/Nb3Sn superconducting joint technology and the related technologies. The key to the Pb-free joining process is the use of a high-temperature tolerable Nb superconducting alloy as an intermediate material, which enables metallic bonding between the Nb3Sn wire and the Nb superconducting alloy intermediate material through a chemical reaction, and between the NbTi wire and the Nb superconducting alloy intermediate material by pressure welding. Consequently, the NbTi/Nb3Sn superconducting joint is realized. This novel technology is expected to be used in the world’s first Pb-free, environmentally friendly NMR superconducting magnets.
Rights:
Keyword: NbTi, Nb3Sn, NMR, Pb-free, Superconducting joint
Date published: 2025-07-20
Publisher: Cryogenic Association of Japan
Journal:
- TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) (ISSN: 03892441) vol. 60 issue. 4 p. 141-147
Funding:
Manuscript type: Author's version (Accepted manuscript)
MDR DOI: https://doi.org/10.48505/nims.5611
First published URL: https://doi.org/10.2221/jcsj.60.141
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Updated at: 2025-07-25 12:30:26 +0900
Published on MDR: 2025-07-25 12:17:31 +0900
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