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Processing and Superconducting Properties of the Butt-Joint of Bi-2212/Ag Multifilamentary Tape

1997; Japan Institute of Metals and Materials; Volume: 61; Issue: 9 Linguagem: Inglês

10.2320/jinstmet1952.61.9_849

1880-6880

Michiya Okada, K. Fukushima, Kazuhide Tanaka, Tatsumi Hirano, Junichi Sato, Hitoshi Kitaguchi, Hiroaki Kumakura, K. Togano, Hitoshi Wada,

Superconducting Materials and Applications

Processing and the superconducting properties of the butt-joint for Bi-2212/Ag multifilamentary tapes were studied in relation to the crystal orientation. The multifilamentary Bi-2212/Ag tapes with 19 and 55 filaments were prepared by a powder-in-tube technique. The tapes were butt-jointed, followed by partially melting in a flowing oxygen atomosphere. The typical dimensions of the tapes used in the experiments were 5 mm in width, 0.15 mm in thickness, and 30 mm in length. The critical current Ic of the joint reached around 500 A, showing a great possibility for practical applications. The crystal alignment of the butt-jointed tape was analyzed by means of a transmissive X-ray diffraction method, and found the preferred orientation was realized in the joint part. The marked angular dependence of Jc of the joint on angle between a tape and field at 4.2 K and 8∼10 T also proved the c-axis alignment.