No abstract

In this study, we investigated the effect of filament size on J e for high filament count Bi2212 round wire conductors partial melt processed with T max between 882 and 890 C in pure oxygen. The filament size that produced maximum J e was between 12 and 15 m depending on conductor design and T max . When the filament size was below 12 m the filaments were unstable during partial melt processing leading to a break-up in the structure of the filament array and low J e . This effect is attributed the formation of interconnects between filaments which leads to coarsening driven by a reduction in interfacial surface energy.Index Terms-Bi2212/Ag round wire, high-temperature superconductors, superconducting filaments and wires.