Abstract
Critical current densities of Bi-2223 tapes made by the oxide-powder-in-tube (OPIT) process depend on the microstructure of the superconductor. Conventional ceramic synthesis techniques lead to a multiphase microstructure with large second phase particles and poor grain alignment, which can disrupt the path for current transport. To overcome the limitations of conventional processing, a cryoprocessing technique (freeze-drying) was developed, which provided control of the phase assemblage to be packed into the Ag tubes before mechanical working. The freeze-drying process resulted in intimate mixing of CaCuO2 and Bi1.8Pb0.4Sr2CaCu2Oz and led to rapid formation of the 2223 phase with a minimum of impurity phases. The process allows for the large scale synthesis of precursors specifically tailored to the manufacture of long lengths of tapes by the OPIT process.
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© 1996 Springer Science+Business Media New York
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Krishnaraj, P., Lelovic, M., Deis, T., Prorok, B.C., Eror, N.G., Balachandran, U. (1996). Control of Precursors for BSCCO Powder-in-Tube Process by Cryoprocessing. In: Summers, L.T. (eds) Advances in Cryogenic Engineering Materials . Advances in Cryogenic Engineering Materials , vol 42. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9059-7_112
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DOI: https://doi.org/10.1007/978-1-4757-9059-7_112
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