Effect of Silver Addition on the Mechanical and Field Trapping Properties of Gd-Ba-Cu-O Bulk Superconductors

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  • Nariki Shinya
    Superconductivity Research Laboratory, International Superconductivity Technology Center
  • Sakai Naomichi
    Superconductivity Research Laboratory, International Superconductivity Technology Center
  • Matsui Motohide
    Superconductivity Research Laboratory, International Superconductivity Technology Center
  • Murakami Masato
    Superconductivity Research Laboratory, International Superconductivity Technology Center

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Other Title
  • Gd-Ba-Cu-O系バルク超伝導材料の機械的特性および捕捉磁場特性に及ぼす銀添加の影響
  • Gd Ba Cu Oケイ バルク チョウデンドウ ザイリョウ ノ キカイテキ トクセイ オヨビ ホソク ジバ トクセイ ニ オヨボス ギン テンカ ノ エイキョウ

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Abstract

The effect of Ag addition on the microstructure and the mechanical and field trapping properties of Gd-Ba-Cu-O bulk superconductor has been investigated. The single grain Gd-Ba-Cu-O bulk superconductors 32 mm in diameter were fabricated with 0-30 mass%Ag2O additions by the melt growth method under controlled oxygen partial pressure of 1.0%. From microscopic observations, it was found that the macro-cracks in the a-b plane decreased with Ag addition. The three-point bending test showed that the average strength of Ag-free bulk was 69 MPa at room temperature, while the strength was dramatically improved to 110-115 MPa with 10-30 mass%Ag2O additions. The trapped magnetic field of Ag-free bulk sample was 1.3 T at 77 K. The trapped field of bulk Gd-Ba-Cu-O samples with 10-20 mass%Ag2O exhibited high values of 1.8-2.0 T at 77 K. However, the trapped field of the sample with 30 mass%Ag2O addition was lowered to 1.1 T with decreasing the critical current density. The trapped field of Ag-added sample did not deteriorate with thermal cycles. The trapped fields at lower temperatures were also measured for the Ag-free and 20 mass%Ag2O added bulk samples without reinforcement by the metal ring or resin. The Ag-free bulk exhibited the trapped field of 3.0 T at 65 K, however, the bulk was fractured at lower temperature due to an electromagnetic force. On the other hand, the Ag-added bulk could trap the higher field of 6.7 T at 55 K, thanks to the improvement in mechanical strength.

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