Ag-sheathed Bi2Sr2CaCu2Ox round wires having 37 and 259 filaments, with filament diameters ranging from 11 to 100 μm, were fabricated by the oxide-powder-in-tube method. They were heat treated using step-solidification melt processing in air and pure O2. The transport critical current density was highest in wires processed in pure O2. It increased with decreasing filament diameter and was highest [165 000 A/cm2 (4.2 K, O T)] in wires with 11 μm filaments processed in O2.

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A bstract--Round multlfllament Bi2Sr2Ca l C u 2 0 x In this paper we describe further the micmsmcture and Jc superconducting. Thus, 2212 is well-suited to use the process developed for fabricating Nb3Sn. In addition, because the melt processing for 2212 is relatively short and the fabrication steps are straightforward, conductor made by Ag-sheathed (Bi,Pb)2Sr2Ca2CugOx (2223) and this process is expected to be less expensive than conductor made using the more complicated 2223 process.

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