Preventing Bubbles in Long Lengths of Ag-Sheathed 2212 Tape
Bubbling is a key issue that limits the performance of Ag-sheathed Bi2Sr2CaCu2Ox (2212) tapes. Tapes that contained 2212 powder with 110 to 535 ppmw carbon were melt processed in 1 atm O2. Bubbling was eliminated by reducing the carbon content in the powder and adding an anneal step at 835°C prior to melting to the processing schedule. CO2 is removed from the tape during the 835°C annealing step.
KeywordsAnnealing Step Vacuum Annealing Processing Schedule Large Volume Fraction Apply Superconductivity
Unable to display preview. Download preview PDF.
- 3.K. Togano, H. Kumakura, H. Kitaguchi, H. Maeda, J. Shimoyama, K. Nomura, and T. Hasegawa, Proceedings of the international workshop on superconductivity, co-sponsored by ISTEC and MRS, 1992,39.Google Scholar
- 5.T. Haugan, S. Patel, M. Pitsakis, F. Wong, S.J. Chen and D.T. Shaw, submitted to J. Elec. Mat., 1995.Google Scholar
- 6.Th. Lang, D. Buhl, M. Cantoni and L.J. Gauckler, Proc.for European Conference on Applied Superconductivity, Edinburgh, Scotland, July 3–6, 1995.Google Scholar
- 7.Private communicationGoogle Scholar
- 11.L.O. El-Marizki, M. Polak and W. Zhang, Proceedings of the International Cryogenic Material Conference, 1995, Columbus, Ohio.Google Scholar
- 12.L.M. Heijnen, T.W. Kuijpers, J.A. Klostermann, High-Temp.-High Pressure, 20:305(1988).Google Scholar