Effect of Zn addition on Nb3Sn layer formation in the Nb/Cu-Sn-Ti diffusion reaction

Koki Asai; Tsuyoshi Yagai; Nobuya Banno

ポスター Effect of Zn addition on Nb3Sn layer formation in the Nb/Cu-Sn-Ti diffusion reaction

Koki Asai (Sophia University) ; Tsuyoshi Yagai (Sophia University) ; Nobuya Banno (Research Center for Energy and Environmental Materials (GREEN)/Hydrogen Technology Materials Field/Advanced Superconducting Wire Group, National Institute for Materials Science)

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Koki Asai, Tsuyoshi Yagai, Nobuya Banno. Effect of Zn addition on Nb3Sn layer formation in the Nb/Cu-Sn-Ti diffusion reaction. https://doi.org/10.48505/nims.5186

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(abstract)

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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