Superconducting Properties of Bi2Sr2CaCu2Oy Tape Prepared by the Continuous Heat Treatment Technique
85m-long Bi2Sr2CaCu2Oy (Bi-2212)/Ag multilayer tape was successful fabricated. The tape was prepared by the slurry-painting technique. The multilayer tape was facricated by stacking three Bi-2212/Ag monolayer tapes prepared by the slurry-painting technique, wrapping them with a Ag foil, and finally giving a continuous heat treatment of partial melting and slow cooling. The continuous heat treatment was done by moving the tape along the temperature gradient in a specially designed pipe furnace. Jc values of the wire were 8 × l03 A/cm2 at 77 K 0T and higher than 1×10 5A/cm2 at 4.2K, 12T. The variation of Jc value along the 85m-long tape was within 15%. The multilayer tapes showed good strain tolelance of Jc. Jc values unchanged until the bending strain of 0.7% was applied. A small coil fabricated using the “React & Wind” technique had a Jc value almost equal to that of a short straight sample.
KeywordsPartial Melting Bias Magnetic Field Tape Conductor Composite Tape Pancake Coil
Unable to display preview. Download preview PDF.
- 2.N. Tomita, M. Arai, E. Yanagusawa, T. Morimoto, H. Kitaguchi, H. Kumakura, K. Togano, T. Kiyoshi, K. Inoue, H. Maeda, K. Nomura and J. C. Vallier, to be published on IEEE Trans, on Mag. (1995)Google Scholar
- 4.W. Zhang and E. E. Hellstrom, to be published on Supercond. Sci. Technol.Google Scholar
- 5.T. Hasegawa, T. Koizumi, Y. Hikichi and Y. Aoki, Proceedings for 1995 International Workshop on Superconductivity : 259(1995)Google Scholar