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Enhancing the characteristics of Nb3Sn superconducting wire is essential for the development of magnets for fusion reactors like ITER and DEMO. It has been established that Ti-doping has a significant effect on enhancing the upper critical magnetic field (Bc2). Ti is generally doped into Nb or Sn-alloys in practical Nb3Sn superconducting wires, and it would be preferable to add Ti to the Sn side from a manufacturing perspective. However, Ti-doping on Sn sites could form some undesirable stable compounds layers at the interface with Nb as a diffusion barrier for Sn during the Nb3Sn layer formation. In this study, specific diffusion couples of Nb/Cu/Sn were fabricated with different combinations of Ti and Zn doping to Cu and Sn and their diffusion reaction behaviors in Nb3Sn layer formation were investigated. Besides, anticipating a potential grain refinement effect, an Mg and Zn co-doped sample was additionally fabricated and the effect of Mg addition was compared.

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Keyword: Nb3Sn, Zn

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Conference: Applied Superconductivity Conference 2024 (2024-09-01 - 2024-09-06)

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Manuscript type: Not a journal article

MDR DOI: https://doi.org/10.48505/nims.5186

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Updated at: 2024-12-19 16:30:54 +0900

Published on MDR: 2024-12-19 16:30:54 +0900