Study of a bi-system superconducting wire with an oxide barrier using the strand and formed method

Abstract

We present the strand and formed method of manufacturing Ag-sheathed Bi-system superconducting round wire. The method strands three round multifilamentary wires into a single round wire. For the strand and formed Bi2Sr2Ca1Cu2Ox (Bi-2212) wire, the critical current Ic exhibited almost no change until the bending strain exceeded 0.6%, while for the conventional round Bi-2212 wire Ic deteriorated when the bending strain exceeded 0.2%. Also, we have measured the alternating-current transport loss of both a strand formed round Bi-Pb2Sr2Ca2Cu3Ox (Bi-2223) wire with a barrier and a conventional tape Bi-2223 wire without a barrier. The measured loss normalized by the Ic of the former was more reduced than that of the latter.