Abstract
Partial melting and slow cooling process was applied for Bi2Sr2Ca1Cu2Ox/Ag tapes prepared by doctor blade and dip-coating processes. During slow cooling in molten state, plate-like 2212 crystals grow parallel to the tape surface, resulting in a highly oriented grain structure of c-axis alignment. Such a textured structure improves the intergrain coupling. We also found that the cooling condition after the solidification has a strong influence on the transport Jc and Tc. The transport Jc at 77K and 0T obtained so far is greater than 20, 000A/cm2, although it is very sensitive to the applied magnetic field. At the temperatures below 30K, the tapes show excellent high field performance. Jc at 4.2K reaches to the practical level (>105A/cm2) even in high magnetic fields. A 64 turn pancake coil was prepared from a 6m long tape produced by the continuous dip-coating process, which generated a central field of about 6, 000Gauss at 4.2K in a bias field of 12T.
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