Abstract
Abstract : The study was to determine if the microstructure of melt processed Ag-sheathed Bi2Sr2CaCu2O(x) (2212) tape could be improved by crystallizing 2212 from its primary phase field. Ag-sheathed tape was fabricated with BSCCO powder whose composition was in the Bi-2212 primary field. It was melt processed. It was learned when analyzing the melt processed tape that the powder that was synthesized was contaminated with Teflon. It had decomposed and reacted with the BSCCO forming SrF2 that shifted the overall BSCCO composition out of the primary phase field. There was not time to synthesize uncontaminated powder in the study. Instead, the effect of the heating rate through the melting point of 2212 was studied. It was found that fully processed tape heated through the melting point at 1 deg C/min had the most homogeneous microstructure. Faster rates led to porosity in the core or ballooning of the Ag-sheath, while slower rates led to large, remnant nonsuperconducting phases in the fully processed tape.
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