Abstract
A new design of macrostructural multifilamentary tapes has been developed by parking powder and composite wires into the silver tube (PWIT) at the second stage of the powder-in-tube (PIT) process. The critical current J c and the strain tolerance for this PWIT multifilamentary tape were significantly improved in comparison with the PIT multifilamentary tapes. The enhancement of both J c and the strain tolerance are attributable to the increased interface between Ag and oxide superconductor. We have introduced a simple concept of the periphery length of the Ag/superconductor interface per unit area in the cross-section of tapes ( E) and have compared its properties in PWIT and PIT tapes. Both J c and the strain tolerance were improved with increasing E. This was attributed to the improved grain alignment and crack elimination at the Ag/superconductor interface. The J c– B properties and the J c-strain characteristic of two tapes have been compared.
Published Version
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