Article Development of the Ultrafine MgB2 Superconducting Wires and Flexible Cables

Akihiro Kikuchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; Yasuo Iijima SAMURAI ORCID (National Institute for Materials ScienceROR) ; Hiroaki Kumakura SAMURAI ORCID (National Institute for Materials ScienceROR) ; Masaru Yamamoto ; Masatoshi Kawano ; Masato Otsubo

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Citation
Akihiro Kikuchi, Yasuo Iijima, Hiroaki Kumakura, Masaru Yamamoto, Masatoshi Kawano, Masato Otsubo. Development of the Ultrafine MgB2 Superconducting Wires and Flexible Cables. IEEE Transactions on Applied Superconductivity. 2023, 34 (3), 6200104. https://doi.org/10.1109/tasc.2023.3335881
SAMURAI

Description:

(abstract)

We successfully fabricated the ultrafine MgB2 mono-core superconducting wires through the general in-situ powder-in-tube process by using a starting mixture of commercial Mg and B powders. The critical current (Ic) decreased monotonically with decreasing the wire diameter, meanwhile, the critical current density was almost the same value with decreasing the wire diameter down to 0.05 mm. In addition, we recognized the Monel outer sheath was very effective in improving the cold-die-drawability to forward the ultrafine diameter. It was fabricated 4 km of long piece length without the wire breakage for the Monel sheathed mono-core wire 0.05 mm in diameter. Furthermore, we challenged the limits of diameter reduction in the present drawing technique, and eventually, the Monel sheathed MgB2 mono-core superconducting wire with 0.015 mm in diameter and 135 m in length was obtained. This is currently the thinnest MgB2 superconducting wire in the world.

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Keyword: MgB2, wire, in-situ process, powder in tube process, die-drawing, fine diameter, twisted cable, flexibility

Date published: 2023-11-22

Publisher: Institute of Electrical and Electronics Engineers (IEEE)

Journal:

  • IEEE Transactions on Applied Superconductivity (ISSN: 10518223) vol. 34 issue. 3 p. 1-4 6200104

Funding:

  • New Energy and Industrial Technology Development Organization JPNP14004

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4700

First published URL: https://doi.org/10.1109/tasc.2023.3335881

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Updated at: 2025-11-22 08:30:16 +0900

Published on MDR: 2025-11-22 08:22:56 +0900

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