Ｓｎ‐Ｔａ系およびＳｎ‐Ｔｉ系合金シートを用いたジェリーロール法Ｎｂ３Ｓｎ超伝導線材の研究

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タイトル別名
  • Studies on Jelly Roll Processed Nb3Sn Superconducting Wires Using Sn-Ta and Sn-Ti Based Alloy Sheets
  • Sn-Ta系およびSn-Ti系合金シートを用いたジェリーロール法Nb3Sn超伝導線材の研究
  • Sn Taケイ オヨビ Sn Tiケイ ゴウキン シート オ モチイタ ジェリー ロールホウ Nb3Sn チョウデンドウ センザイ ノ ケンキュウ

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  Sn-Ta based alloy buttons of different compositions were prepared by the melt diffusion process among constituent metal powders at ∼780°C. The buttons were then pressed into plates. Sn-Ti based alloy plates were sliced from the melt and cast ingot. Resulting Sn-based alloy plates were rolled into thin sheets. The Sn-based alloy sheet was laminated with a commercial Nb sheet, and wound into a Jelly Roll (JR) composite. The composite was encased in a Nb-3.3 at% Ta sheath, and fabricated into a thin wire followed by the heat treatment at 700-775°C. The application of hydrostatic extrusion was useful for the fabrication of JR processed wires. The JR wires using Sn-Ta and Sn-Ti based alloy sheets show a non-Cu Jc of ∼250 A/mm2 at 20 T and 4.2 K, which is considerably higher than that of 16 wt% Sn bronze processed Nb3Sn wires. In the Sn-Ta based alloy sheet the dispersion of Ta powders improves mechanical strength of the sheet. Furthermore, it has been found that the Nb impregnates into the Sn-Ta based alloy layers, and Nb3Sn layers are synthesized by the mutual diffusion between the Nb and Sn-Ta based alloy sheets. Meanwhile, Sn-Ti based alloy sheet is attractive due to its easiness of mass production. Structure and performance of JR processed Nb3Sn wires prepared from Sn-based alloy sheets with different composition are compared.<br>

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 71 (11), 946-951, 2007

    公益社団法人 日本金属学会

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