Fabrication and properties of high J(c) multifilamentary (Bi,Pb)-2223 tapes with Ag-alloy sheath

(Bi,Pb)-2223 tapes with 37 filaments have been fabricated by powder in tube (PIT) method. Silver was used for the sheath of filaments and the Ag-Mn-Ni alloy was used for the outer sheath of the tapes. A high critical current density of 29000A/cm(2) (77K, 0T) has been achieved in rolled tape with Ag- alloy sheath, in this case the critical current of the tapes is 81.5A, whic h is higher than that of multifilamentary tapes with pure Ag sheath prepare d by the same process. The precursor powders prepared by mixing the (Bi,Pb) -2212 and CaCuO2 has been considered to be beneficial for fabricating high Je multifilamentary tapes with Ag-alloy sheath. The superconducting propert ies and microstructural characteristics of the multifilamentary tapes have been investigated in this work.