Multifilamentary MgB2/Fe wires and tapes with high transport critical current densities were fabricated by using a straightforward powder-in-tube process. After annealing, measurements were made of transport JC values of up to 1.1 x 105A/cm2 at 4.2K in a field of 2T in a MgB2/Fe square wire with 7 filaments fabricated by 2-axis rolling, and up to 5 x 104A/cm2 at 4.2K in 1T in a MgB2/Fe tape with 7 filaments. For higher currents, these multifilamentary wires and tapes quenched due to insufficient thermal stability of the filaments. Both the processing routes and deformation methods were found to be important factors for fabricating multifilamentary MgB2 wires and tapes with high JC values.

Fabrication and Transport Critical Currents of Multifilamentary MgB2/Fe Wires and Tapes. H.L.Suo, C.Beneduce, X.D.Su, R.Flükiger: Superconductor Science and Technology, 2002, 15, 1058-62