Influence of Oxygen Partial Pressure in the Sintering Atmosphere on the Microstructure of Ag-Sheathed Bi2223 Tapes

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  • Ito Hideki
    Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University
  • Horita Takashi
    Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University
  • Nonaka Souhei
    Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University
  • Osamura Kozo
    Department of Materials Science and Engineering, Graduate School of Engineering, Kyoto University

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  • AgシースBi2223テープ材における微細組織に及ぼす熱処理時の酸素分圧の影響
  • Ag シース Bi2223 テープザイ ニ オケル ビサイ ソシキ ニ オヨボス ネツ ショリジ ノ サンソ ブンアツ ノ エイキョウ

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Abstract

The influence of oxygen partial pressure on the microstructure of Ag/Bi2223 tapes has been investigated in the condition of the powder-in-tube method. When oxygen partial pressure (PO<SUB>2</SUB>) was fixed at 7.8 kPa during the heat treatment at temperatures between 1102 and 1103 K, the highest value of critical current density (Jc) was achieved. However, Jc tended to decrease when the heat treatment temperature decreased to 1099 K under oxygen partial pressures between 3.0 and 7.8 kPa. When the volume fraction of 2223 phase increases and the alignment of plate-like 2223 grains becomes parallel each other, the Jc becomes higher.

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