Abstract
Numerous variables are encountered in the fabrication of superconductor wires by extrusion and by powder-in-tube processing. The decomposition of plastically extruded YBCO is minimized by firing at reduced total pressure. Sintering the extruded YBCO wires at an oxygen partial pressure of 7.6 mm Hg results in densification and a fine grained micro-structure. A reduction in average grain size from 23 to 4 µm increased strength from 83 to 191 MPa. Addition of 15 vol.% Ag particles causes a further increase in strength to 222 MPa due to compressive stresses in the YBCO matrix from the Ag. In powder-in-tube processing, the primary considerations are the mechanical-working and heating schedules. The best properties in Ag-clad Bi-based superconductors are obtained with many small reductions during working and by the use of liquid-phase formation during sintering to promote grain growth.
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