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High-temperature superconductor bulk magnets that can trap magnetic fields of over 17 tesla at 29 K

Author

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  • Masaru Tomita

    (Superconductivity Research Laboratory
    Railway Technical Research Institute)

  • Masato Murakami

    (Superconductivity Research Laboratory)

Abstract

Large-grain high-temperature superconductors of the form RE-Ba-Cu-O (where RE is a rare-earth element) can trap magnetic fields of several tesla at low temperatures, and so can be used for permanent magnet applications1,2. The magnitude of the trapped field is proportional to the critical current density and the volume of the superconductor3,4. Various potential engineering applications for such magnets have emerged5,6,7,8,9,10,11,12,13, and some have already been commercialized7,8,9,10. However, the range of applications is limited by poor mechanical stability and low thermal conductivity of the bulk superconductors14,15,16,17; RE-Ba-Cu-O magnets have been found to fracture during high-field activation, owing to magnetic pressure14,15,16. Here we present a post-fabrication treatment that improves the mechanical properties as well as thermal conductivity of a bulk Y-Ba-Cu-O magnet, thereby increasing its field-trapping capacity. First, resin impregnation and wrapping the materials in carbon fibre improves the mechanical properties. Second, a small hole drilled into the centre of the magnet allows impregnation of Bi-Pb-Sn-Cd alloy into the superconductor and inclusion of an aluminium wire support, which results in a significant enhancement of thermal stability and internal mechanical strength. As a result, 17.24 T could be trapped, without fracturing, in a bulk Y-Ba-Cu-O sample of 2.65 cm diameter at 29 K.

Suggested Citation

  • Masaru Tomita & Masato Murakami, 2003. "High-temperature superconductor bulk magnets that can trap magnetic fields of over 17 tesla at 29 K," Nature, Nature, vol. 421(6922), pages 517-520, January.
  • Handle: RePEc:nat:nature:v:421:y:2003:i:6922:d:10.1038_nature01350
    DOI: 10.1038/nature01350
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    Cited by:

    1. Tomita, Masaru & Suzuki, Kenji & Fukumoto, Yusuke & Ishihara, Atsushi & Akasaka, Tomoyuki & Kobayashi, Yusuke, 2017. "Energy-saving railway systems based on superconducting power transmission," Energy, Elsevier, vol. 122(C), pages 579-587.
    2. Daniel Shaked & Eldad Holdengreber, 2022. "Efficiency Improvement of an Electric-Grid Transformer Using the Diamagnetism Characteristics of a Bulk Superconductor," Energies, MDPI, vol. 15(19), pages 1-12, September.
    3. Tomita, Masaru & Fukumoto, Yusuke & Ishihara, Atsushi & Kobayashi, Yusuke & Akasaka, Tomoyuki & Suzuki, Kenji & Onji, Taiki, 2023. "Superconducting DC power transmission for subway lines that can reduce electric resistance and save energy," Energy, Elsevier, vol. 281(C).

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