Improvement of Critical Current Density of Bi2223 Superconducting Oxide Tapes by Multilayering with Ag.

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  • 酸化物超伝導体の合成と特性　Ａｇとの多届化によるＢｉ２２２３酸化物超伝導テープ材のＪｃの改善
  • Ag ト ノ タソウカ ニヨル Bi2223 サンカブツ チョウデンドウ テー

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Abstract

Ag/Bi2223 multilayered wires and tapes were prepared by the jelly roll method. The wires are composed of 2223 and Ag layers and exhibit supercondcutivitiy at temperatures above 77 K. The critical current density (Jc) of 3200A/cm2 was obtained for the wire of 2 mm in diameter. The multilayered tapes consist of a highly oriented 2223 phase over the whole tape region. Jc of the multilayered tape increases with decreasing tape thickness and reaches a maximum value of 8200 A/cm2 at 0. 25 mm in thickness. The Jc is further enhanced by the thermomechanical treatment and the high Jc of 17200 A/cm2, corresponding to Ic of 29. 2 A is attained. Moreover, the multilayered tape of 0. 25 mm in thickness is bent up to a bending strain of 0.6% without detriation of Jc. These results indicate that the multilayering with Ag is effective to improve Jc of the Bi2223 superconducting oxide wire.

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