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Preparation of High Tc Oxide Superconducting Filaments by Suspension Spinning Method

  • Tomoko Goto
  • Hiroyuki Inaji
  • Katsuhiko Takeuchi
  • Keisaku Yamada
Conference paper

Abstract

The suspension spinning of Ln-Ba-Cu-0 (Ln=Dy, Y, Ho and Er), Bi-Sr-Ca-Cu-0 and Tl-Ba-Ca-Cu-0 was examined to prepare a long filament with high Jc. A fine powder of the oxide was suspended in PVA solution containing a dispersant. The viscous suspension was extruded as a filament into precipitating medium and the filament was coiled on a winding drum. The obtained filament about 200 μm in diameter was heated to remove volatile components and to generate the superconducting phase.

The Ln-Ba-Cu-O filament was a superconductor at 84 K and The highest Jc value at 77 K, O field, of 1128 A/cm2 was attained for the Ho1Ba2Cu3Ox filaments. The Jc increased at 2500 A/cm2 by one directional solidification treatment.

The Bi-Sr-Ca-Cu-0 filament was found to consist of two different superconducting phases with Tc values of 110 K and 80 K. The maximum Jc at 77 K was 2 A/cm2. Since T12O3 is chemically instable at the synthesis temperature, the preparation of Tl-Ba-Ca-Cu-0 superconducting filament by this method was not easy because of the side reaction with PVA and volatility from large surface area of the filament. The Tl-Ba-Cu-O filament exhibited the best superconducting properties with an onset temperature as high as 90 K and zero resistivity at 40 K.

Keywords

Directional Solidification Processing Octyl Phenyl Viscous Suspension Oxide Filament Octyl Phenyl Ether 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Japan 1989

Authors and Affiliations

  • Tomoko Goto
    • 1
  • Hiroyuki Inaji
    • 1
  • Katsuhiko Takeuchi
    • 1
  • Keisaku Yamada
    • 1
  1. 1.Department of Materials Science and EngineeringNagoya Institute of TechnologyShowa-ku, Nagoya, 466Japan

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