Overview of the recent performance of DI-BSCCO wire

Sumitomo Electric has been developing the silver-sheathed Bi2223 multi-filamentary wires since the discovery of Bi-based superconductors. DI-BSCCO (Dynamically-Innovative BSCCO) is the high performance wires produced with the controlled-overpressure (CT-OP) sintering technique. The recent R&D activities have enabled to produce the 1000 m-long wires with Ic of 200 A and the maximum Ic reached 250 A at 77 K by short sample. Besides, the fine control of the carrier density with the non-stoichiometric oxygen enhanced the in-field Ic performances at lower temperature. At a magnetic field of 3 T applied normal to wire surface, the Ic of 280 A at 30 K, and 420 A at 20 K were successfully achieved. To meet the growing needs for various high temperature superconducting applications, Type HT wire with high mechanical strength and Type G wire with low thermal conductivity have been developed.

► We developed the 1000 m-long Bi2223 wires with high Ic and the other performances.
► The effects of the carrier level with non-stoichiometric oxygen on Ic were studied.
► The lamination with stainless steel drastically enhances wires’ mechanical strength.
► The current lead-purpose wires sheathed with Ag–Au alloy showed Ic of over 200 A.