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

摘要

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 Bi_2Sr_2Ca_1Cu_2O_x (Bi-2212) wire, the critical current I_c exhibited almost no change until the bending strain exceeded 0.6 percent, while for the conventional round Bi-2212 wire I_c deteriorated when the bending strain exceeded 0.2 percent. Also, we have measured the alternating-current transport loss of both a strand formed round Bi-Pb_2Sr_2Ca_2Cu_3O_x (Bi-2223) wire with a barrier and a conventional tape Bi-2223 wire without a barrier. The measured loss normalized by the I_c of the former was more reduced than that of the latter.