Abstract
High-filament-count, silver-sheathed composite wires of YBa2Cu4O8 were prepared by a metallic precursor route. The ductility of the metallic precursor enabled the manufacture of tapes containing up to 962,407 filaments, with filament dimensions as fine as 0.25 μm thick and 1 μm wide. The combination of thermal-mechanical treatment and fine filament dimensions resulted in significant biaxial crystallographic texture. Transport critical current densities in the oxide filaments of 69.5 kA/cm2 at 4.2 Kin self-field with reduced weak-link behavior in an applied field were obtained. Critical current retention during bending was shown to increase as filament count increased, with the highest filament-count material showing close to one percent critical bending strain. These wires exhibited some of the best properties for a polycrystalline, sintered wire of YBCO in an applied magnetic field.
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