Progress in performance of DI-BSCCO family

DI-BSCCO, the commercial BSCCO tapes produced by Sumitomo Electric with the controlled-overpressure sintering technique, has been progressing in the performance for increasing expansion of high temperature superconducting applications. Type H as the most common product has recorded 218 A as the highest critical current in 77 K, self-field, which is corresponding to 500 A per 1 cm width. Now it can provide both long-length and uniform high critical current up to 180 A as commercial products. Type S offers high overall critical current density similar to Type H and half cross-sectional area and the narrower width around 2.5 mm. It gives low price and compact size as a benefit to the applications operated with the relatively smaller current. Type AC offers low AC loss which is produced by application of the narrow width similar to Type S and twisted multi-filaments. All the products have achieved long-length more than 1 km and uniform critical currents over the entire length of the tapes. Mechanical toughness comes from metallic tape lamination technique applicable to all DI-BSCCO family as an optional extra. A 3-ply tape of one Type H and two thin stainless steel tapes provides high rated tensile stress more than 300 MPa and high current density more than 13 kA/cm 2 in 77 K. Alternative brass or copper laminated tape brings about lower electric resistance under overload current. It is possible to produce an order-made tape under consultation, which exhibits excellent manifold abilities on critical current, AC property as well as mechanical properties.