PIT processed MgB 2 thin wires sheathed with stainless steel

Y. Yamada, M. Kanazawa, T. Ohno, K. Tachikawa, Kazuhiro Kajikawa, T. Inoue, I. Aoki, A. Matsumoto, H. Kumakura

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Abstract

MgB 2 superconducting thin wires sheathed with stainless steel (SS) have been prepared by in-situ powder-in-tube (PIT) process. Using Magnesium hydride MgH 2 and amorphous B powders, SS sheathed MgB 2 thin wires have been fabricated through drawing to form the round wires of 0.20 mm ∼ 0.10 mm in diameter. The SS sheath of 0.1 mm in diameter was hardened to be a Vickers hardness of around 600 HV through cold-working at room temperature without annealing. The heat treatment was performed at 630°C for 5 h in Ar gas atmosphere. The SS sheath recovered the hardness of 400 HV after heat treatment. The MgB 2 wires show the critical temperature (T c) of around 35 K in onset and sharp transition of 2 K. The transport critical current (T c) at 4.2 K and self-field are 40 A and 8 A for the MgB 2 thin wires of 0.2 mm and 0.1 mm in diameter, respectively. The I c values correspond to the critical current density (J c)of around 4,000-5,000 A/mm 2 . The present thin wires with low thermal conductivity are promising as level sensors for liquid hydrogen and current leads with small heat leakage.

Original languageEnglish
Article number6082402
JournalIEEE Transactions on Applied Superconductivity
Volume22
Issue number3
DOIs
Publication statusPublished - Jun 25 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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