Processing issues for high critical current density in BSCCO-2212 composites

Abstract

Issues for controlling the critical current density (J/sub c/) in long tapes and wires include homogeneity of the starting powders, optimization of the ceramic size and shape, uniformity of the deformation or coating processes, and control of the heat treatment parameters. This range of issues is discussed for both multilayer dip-coated and multifilamentary powder-in-tube composites. In particular, J/sub c/ is shown to depend strongly on ceramic size and shape. Continuing efforts to correlate J/sub c/ with processing issues are presented. Progress toward applications in high field coils is described.