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

• 成木 紳也

  財団法人　国際超電導産業技術研究センター超電導工学研究所

• 坂井 直道

  財団法人　国際超電導産業技術研究センター超電導工学研究所

• 松井 元英

  財団法人　国際超電導産業技術研究センター超電導工学研究所

• 村上 雅人

  財団法人　国際超電導産業技術研究センター超電導工学研究所

書誌事項

タイトル別名

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

抄録

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.

収録刊行物

• 日本金属学会誌

  日本金属学会誌 66 (4), 309-314, 2002

  公益社団法人 日本金属学会

キーワード

• superconductor
• GdBa<SUB>2</SUB>Cu<SUB>3</SUB>O<I><SUB>y</SUB></I>
• silver
• melt-growth
• mechanical property
• three point bending strength
• crack
• trapped magnetic field
• critical current density

詳細情報

• CRID: 1390001206492049024
• NII論文ID: 130007342479
• NII論文ID: 10008832553
• NII書誌ID: AN00187860
• DOI: 10.2320/jinstmet1952.66.4_309
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• NDL書誌ID: 6151542
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6151542
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet1952/66/4/66_4_309/_pdf
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
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