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説明:

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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• In Copyright
  

  © 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.

キーワード: MgB2, wire, in-situ process, powder in tube process, die-drawing, fine diameter, twisted cable, flexibility

刊行年月日: 2023-11-22

出版者: Institute of Electrical and Electronics Engineers (IEEE)

掲載誌:

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

研究助成金:

• New Energy and Industrial Technology Development Organization JPNP14004

原稿種別: 著者最終稿 (Accepted manuscript)

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

公開URL: https://doi.org/10.1109/tasc.2023.3335881

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更新時刻: 2025-11-22 08:30:16 +0900

MDRでの公開時刻: 2025-11-22 08:22:56 +0900