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<p>Mono-filamentary and 37-filamentary Bi<sub>2</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10+<i>δ</i></sub> (Bi-2223) superconducting tapes were prepared by the powder-in-tube (PIT) technique. In order to improve the engineering current density (<i>J</i><sub>e</sub>) of the Bi-2223 tape, we tailored the silver/superconductor ratio (Ag/S<sub>c</sub> ratio), filaments adhesion and Ag/superconducting interface of the Bi-2223 tapes. The influence of drawing angles (6° &amp; 14°) during the Bi-2223 wire drawing was systematically studied to optimize wire uniformity. It was found that 37-filamentary Bi-2223/Ag wires with a 6° drawing angle didn't merged when the wire diameter reached 1.51&#xa0;mm. Additionally, the filament area uniformity of wires prepared with a 6° drawing angle was superior to that of wires with a 14° drawing angle. Furthermore, the smaller 6° drawing angle significantly enhanced the filament density of Bi-2223 green wires, thereby affecting the Bi-2223 phase formation rate. Owning to increase of filament density and improvement Ag/superconducting core interface, the critical current density (<i>J</i><sub>c</sub>) value increase from 23.6 kA/cm<sup>2</sup> to 27.1 kA/cm<sup>2</sup>.</p>

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Influence of the Drawing Angle in Drawing of Bi-2223/Ag HTS Wire

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Xiaobo Ma,
  • Shengnan Zhang,
  • Lihua Jin,
  • Baitao Shao,
  • Xiaoyan Xu,
  • Jianfeng Li

摘要

Mono-filamentary and 37-filamentary Bi2Sr2Ca2Cu3O10+δ (Bi-2223) superconducting tapes were prepared by the powder-in-tube (PIT) technique. In order to improve the engineering current density (Je) of the Bi-2223 tape, we tailored the silver/superconductor ratio (Ag/Sc ratio), filaments adhesion and Ag/superconducting interface of the Bi-2223 tapes. The influence of drawing angles (6° & 14°) during the Bi-2223 wire drawing was systematically studied to optimize wire uniformity. It was found that 37-filamentary Bi-2223/Ag wires with a 6° drawing angle didn't merged when the wire diameter reached 1.51 mm. Additionally, the filament area uniformity of wires prepared with a 6° drawing angle was superior to that of wires with a 14° drawing angle. Furthermore, the smaller 6° drawing angle significantly enhanced the filament density of Bi-2223 green wires, thereby affecting the Bi-2223 phase formation rate. Owning to increase of filament density and improvement Ag/superconducting core interface, the critical current density (Jc) value increase from 23.6 kA/cm2 to 27.1 kA/cm2.