Superconducting properties and workability of stainless steel/iron sheathed MgB2 thin wires

Yutaka Yamada, Masaya Kanazawa, Yutaka Nemoto, Kyoji Tachikawa, Kazuhiro Kajikawa, Satoru Murase, Hiroaki Kumakura

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

MgB2 superconducting thin wires sheathed with stainless steel (SS) and pure iron (Fe) have been prepared by in-situ powder-in-tube process. Using Magnesium hydride MgH2 and amorphous B powders with and without SiC nano-sized powder addition, SS/Fe/MgB2 composites have been fabricated through grooved rolling and drawing to form the round wires of 0.53̃0.10 mm in diameter. Both SS and Fe sheaths were hardened to be a Vickers hardness of around Hv 650 and Hv 510 through cold-working at room temperature. The transport critical current (Ic) at 4.2 K for the MgB2 wire increases with decreasing the amount of SiC addition in lower magnetic field than 1 T. The Ic at 4.2 K and self-field for the MgB2 wire of 0.10 mm in diameter without SiC addition is 14 A, which corresponds to the critical current density (Jc) of around 1 × 10 A/mm2. The present MgB2 thin wires are promising as current leads and level sensor for liquid hydrogen.

Original languageEnglish
Pages (from-to)434-438
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume74
Issue number7
DOIs
Publication statusPublished - Jul 1 2010

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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