Bi-2212 Oxide Superconducting Tapes and Coils by Doctor-Blade-Casting and Dip-Coating Processes?

H. Maeda ； K. Togano ； H. Kumakura

《Chinese Journal of Physics》 30卷2期 (1992/04) Pp. 217-227

並列摘要

Highly textured Bi2Sr2CaCu2Ox (2212) tapes were prepared by applying partial melting and slow cooling process for BiSrCaCuO/Ag composite prepared by a doctor-blade-casting process and a dip-coating one. Jc at 77 K is greater than 10^4 A/cm^2 in zero magnetic field, however, it is very sensitive to an applied field and shows a large anisotropy with respect to the field direction. These sensitivity and anisotropy are significantly reduced at lower temperatures. Jc's at 4.2 K reach a practical level of 16 A/cm^2 even in high fields above 20 T and show a small anisotropy factor, which should not limit practical application. A 64 turns single pancake coil was prepared using a 6 m long tape produced by the dip-coating process. The coil generated a center field of 0.6 T at 4.2 K in a bias field of 12 T.