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      https://www.ias.ac.in/article/fulltext/boms/042/04/0154

    • Keywords

       

      YBa$_2$Cu$_3$O$_{7−x}$; YBCO core glass fibres; YBCO–silica reaction phases; superconductor wires.

    • Abstract

       

      This work introduces the first reported experiments on drawing YBa$_2$Cu$_3$O$_{7−x}$ (YBCO) into fibres with a fused silica cladding using a fibre draw tower to manufacture YBCO glass fibres. These fibre draw experiments allowed manufacturing fibre sections with core diameters between 50 and 200 $\mu$m and a length of around 1.2 m. However, reactionsbetween the fused silica cladding and the YBCO core were revealed by the fibre drawing process. Therefore, this study focusses on investigating these reactions (in as-drawn fibres as well as after additional heat-treatments) using energy dispersive spectroscopy analyses on an environmental scanning electron microscope as well as using X-ray photoelectron spectroscopyanalyses and a cross-polarized light study. The results showed the formation of silica precipitations inside the as-drawn YBCO core, forming an interface layer between the core and the cladding regions, as well as the presence of a high silicon content inside the core with a possible silicate formation. Additional heat-treatments have shown the formation of silica and copper oxide co-precipitations at 900$^{\circ}$C. In addition, heat-treatments at higher temperatures have shown the occurrence of further reactions, which led to a degradation of the core and the formation of new phases.

    • Author Affiliations

       

      HANNA HEYL1 DANIEL HOMA1 GARY PICKRELL1

      1. Department of Materials Science and Engineering, Virginia Polytechnic Institute and State University, 213 Holden Hall, Blacksburg, VA 24060, USA
    • Dates

       
  • Bulletin of Materials Science | News

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