SiC addition for MgB2 superconducting wire by suspension spinning

Tomoko Goto, Kazuo Watanabe, Gen Nishijima

Research output: Contribution to journalArticle

Abstract

The effect of nanoscale SiC addition on the field dependence of J c for MgB2 superconducting wire by suspension spinning was examined to enhance the flux pinning. The suspension spinning of commercially available MgB2 and SiC powders was examined to fabricate a long superconducting MgB2 wire by using the spinning medium of poly(vinyl alcohol) (PVA) or polyacrylonitrile (PAN). The as-drawn filaments were uniaxially pressed under 20 MPa at 200° C for 8 h to remove volatile components and connect the MgB2 grains. The filamentary samples were enveloped by an iron sheet with a pellet of mixed powder of Mg and B to prevent Mg loss, and vacuum-sealed in a fused quartz tube and sintered. The field dependence of Jc for the samples was examined at 4.2 K in magnetic fields up to 14 T. The Jc of the sample was strongly dependent on the spinning medium and sintering condition. Addition of 5 at% SiC in the sample spun by PVA medium attained the maximum Jc value more than 1000 A/cm2 at 4.2 K by applying the field of 14 T.

Original languageEnglish
Pages (from-to)3341-3344
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume15
Issue number2 PART III
DOIs
Publication statusPublished - 2005 Jun 1

Keywords

  • Critical current
  • Magnesium diboride
  • Superconducting filaments and wires
  • Suspension spinning

ASJC Scopus subject areas

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

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