Development of Nb<sub>3</sub>Sn Multi-filamentary Wires Superior in Mass Productivity

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  • 量産性に優れたNb<sub>3</sub>Sn 多芯線材の開発
  • 量産性に優れたNb₃Sn多芯線材の開発
  • リョウサンセイ ニ スグレタ Nb ₃ Sn タシン センザイ ノ カイハツ

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Abstract

We have developed superconducting wire about bronze route Nb3Sn and internal tin processed Nb3Sn. SH Copper Products Ltd. manufactures bronze route Nb3Sn superconducting strands for ITER-TF coils under a contract with the Japan Atomic Energy Agency (JAEA). The Nb3Sn strands which are composed of Nb-1 wt%Ta filaments and Cu-15.5 wt%-0.3 wt%Ti bronze have good workability and high performance. More than 850 A/mm2 of non Cu Jc at 12 T can be stably obtained using two-stage heat treatment technique. The internal-tin technique is an excellent method for fabricating Nb3Sn superconducting wire with a high critical current density. We have developed a new type of internal-tin Nb3Sn wire in which the multi-filamentary wire is fabricated by combining mono-filamentary Nb elements and mono-filamentary Sn elements. The simple fabrication process will enable the fabrication cost of the wires to be reduced.

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