SILVER-SHEATHED BI(2223) WIRE AND APPLICATION

Among many high-T(c) oxide superconductive materials and processing technologies, a combination of the bismuth high-T(c) phase and the powder-in-tube technique is revealed to be useful for long-wire fabrication and many applications in various fields, such as large current conductors, cryogenic current leads and magnets. Maximum J(c) at 77.3 K reached 53 700 A/cm2 in a zero magnetic field, 42 300 A/cm2 at 0.1 T and 12 000 A/cm2 at 1 T. Maximum J(c) of multifilamentary wire at 77.3 K reached 15 400 A/cm2. A 30 m long wire with a multifilamentary structure was fabricated. J(c) over the whole length of this wire was 5190 A/cm2 at 77.3 K. Results of prototypes were summarized and revealed that many applications in a wide temperature range from 4.2 to 77.3 K will be feasible in the near future.