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Selection of Fe as a barrier for manufacturing low-cost MgB 2 multifilament wires – Advanced microscopy study between Fe and B reaction

Journal of Magnesium and Alloys, ISSN: 2213-9567, Vol: 12, Issue: 7, Page: 2783-2792
2024
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  • Captures
    2
  • Mentions
    1
    • News Mentions
      1
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        1

Article Description

The high cost of using the niobium (Nb) barrier for manufacturing magnesium diboride (MgB 2 ) mono-and multi-filamentary wires for large-scale applications has become one of the barriers to replacing current commercial niobium-titanium superconductors. The potential of replacing the Nb barrier with a low-cost iron (Fe) barrier for multifilament MgB 2 superconducting wires is investigated in this manuscript. Therefore, MgB 2 wires with Fe barrier sintered with different temperatures are studied (from 650 °C to 900 °C for 1 h) to investigate the non-superconducting reaction phase of Fe-B. Their superconducting performance including engineering critical current density ( J e ) and n -value are tested at 4.2 K in various external magnetic fields. The best sample sintered at 650 °C for 1 h has achieved a J e value of 3.64 × 10 4 A cm −2 and an n -value of 61 in 2 T magnetic field due to the reduced formation of Fe 2 B, better grain connectivity and homogenous microstructure. For microstructural analysis, the focused ion beam (FIB) is utilised for the first time to acquire three-dimensional microstructures and elemental mappings of the interface between the Fe barrier and MgB 2 core of different wires. The results have shown that if the sintering temperature can be controlled properly, the J e and n -value of the wire are still acceptable for magnet applications. The formation of Fe 2 B is identified along the edge of MgB 2, as the temperature increases, the content of Fe 2 B also increases which causes the degradation in the performance of wires.

Bibliographic Details

Hao Liang; Dipak Patel; Ziming Wang; Akiyoshi Matsumoto; Matt Rindfleisch; Micheal Tomsic; Richard Taylor; Fang Liu; Yusuke Yamauchi; Md. Shahriar A Hossain

Elsevier BV

Engineering; Materials Science

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