Abstract
The transport critical current of Ag sheathed Bi(2223) tapes produced by rolling has been improved by an optimization of some crucial parameters of the tape fabrication process. The correlation between the critical current density and the powder heat treatment temperature and time, the cold deformation steps, as well as the tape heat treatment temperature and time has been studied. Moreover, among all the previously cited parameters, we have found that the pressure exerted on the tapes during the rolling deformation between the heat treatments has a strong influence on the transport properties: a maximum jc(77K, 0T) value of 30 kA/cm2 on rolled Bi(2223) tapes was found for a rolling pressure of 0.6 GPa. At higher pressures, the formation of transversal cracks in the filament limits the critical current.
Published Version
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