High critical current Ag and Ag alloy sheathed multifilament Bi-2223 tapes

W.G. Wang, Z. Han, P. Skov-Hansen, J. Goul, M.D. Bentzon, P. Vase, Yi-Lin Liu

    Research output: Contribution to journalConference articleResearchpeer-review


    Ag sheathed Bi-2223 multifilament tapes with filament numbers of 19, 37, 55, and 85 were produced by the powder-in-tube method. Enhanced tape performance has been achieved by optimisation of the processing conditions. Key factors are addressed that include elimination of the 2212 phase, improving grain connectivity through reducing the 2201 phase and alkaline earth cuprate phases, increasing superconductor core density as well as enhancing current contribution from edge filaments. A high J(c) of 50 kA/cm(2) with an I-c of 42 A has been achieved reproducibly in 19 filament tapes with dimensions of 0.16x2.8 mm(2) and silver/superconductor ratios of 4.4:1. By reducing the silver ratio, a J(e) of 14 kA/cm(2) with an I, of 38 A has been obtained in 55 filament tapes and an I-c of 84 A has been obtained in a tape with dimensions of 4x0.23 mm(2). A record J(c) of more than 30 kA/cm(2) with an I-c of 32 A was achieved in 250 metres long standard tapes. A 1250 m long pure Ag sheathed tape and an 1100 m long Ag alloyed tape have been produced with a J(c) of higher than 25 kA/cm(2) by using optimised process parameters.
    Original languageEnglish
    JournalI E E E Transactions on Applied Superconductivity
    Issue number2
    Pages (from-to)2613-2616
    Publication statusPublished - 1999
    Event1998 Applied Superconductivity Conference - Palm Desert, CA, United States
    Duration: 13 Sept 199818 Sept 1998


    Conference1998 Applied Superconductivity Conference
    Country/TerritoryUnited States
    CityPalm Desert, CA


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