Influence of oxygen content on some properties of Nb3Sn tape used for superconducting transmission lines |
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Authors: | M Jergel T Melíšek H Allárová D I Belyj V P Kutepov A J Izrailev D Synak J Neuschl J Ivan |
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Affiliation: | (1) Electrotechnical Institute, Slovak Academy of Sciences, Dúbravská cesta, 84239 Bratislava, Czechoslovakia;(2) All-Union Institute for Cable Industry, Podosk, USSR;(3) Kablo, k.p., Továrenská ul. 9, 81261 Bratislava, Czechoslovakia;(4) Institute of Metallic Materials, Slovak Academy of Sciences, Febr. vi. 75, 83606 Bratislava, Czechoslovakia |
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Abstract: | The influence of the presence of oxygen in the Nb-Zr substrate upon some physical and mechanical properties of the Nb-ZrO2 substrate and/or Nb3Sn tape superconductor prepared from such a substrate has been studied. The results have shown that the Nb3Sn grains are much finer in the case of Nb-ZrO2, than those obtained on Nb-Zr substrate. As a result, both the electrical and mechanical properties have been substantially improved. The critical current at a field of 5 T increased by between 100 and 200 %, the alternating current losses decreased by about one order of magnitude, the tensile strength increased by about a factor of three and the microhardness value also increased by about a factor of three for oxygen contents in the range 0.03 to 0.70 wt%. The specific resistance of this substrate increased at the same time from 17 to 22 cm and the relative elongation decreased from 5 to 3 %. |
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