Development of Ag Sheathed Bi(2223) Tapes for Power Applications with Improved Homogeneity
The development of the fabrication process of Ag sheathed Bi(2223) tapes has been carried out in order to improve their transport and mechanical properties, as required by the power applications which are so far under study. Critical current density values of 28 kA/cm2 at 77K have been achieved on long multifilamentary Bi(2223) tapes, with a fabrication process that has been successfully employed in the fabrication of samples longer than 50 m. The microstructure and homogeneity of Ag sheathed multifilamentary Bi(2223) tapes has been markedly improved by employing a prototype four-roll machine, which allows the deformation of rectangular shaped wires. The first long tapes prepared with this new technique have shown a remarkable homogeneity, both of the microstructure and of the transport properties. At present, critical current densities of 25 kA/cm2 at 77K have been achieved on long samples prepared with this new technique.
KeywordsCritical Current Density Vickers Microhardness Misalignment Angle Vickers Microhardness Measurement Transport Critical Current Density
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