Journal article · Conference paper
High critical current Ag and Ag alloy sheathed multifilament Bi-2223 tapes
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.
Language: | English |
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Publisher: | IEEE |
Year: | 1998 |
Pages: | 2613-2616 |
Proceedings: | 1998 Applied Superconductivity Conference |
ISSN: | 15582515 , 23787074 and 10518223 |
Types: | Journal article and Conference paper |
DOI: | 10.1109/77.785022 |
(BiPb/sub 2/)Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ (BiPb/sub 2/)Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/ Ag alloy sheathed multifilament tapes 1100 m 250 m 32 A Ag Ag alloy sheathed multifilament Bi-2223 tapes Ag alloyed tape Ag sheathed multifilament Bi-2223 tapes Bi-2223 multifilament tapes Critical current High temperature superconductors Multifilamentary superconductors Shape measurement Silver Superconducting cables Superconducting filaments and wires Superconducting films Superconducting integrated circuits Superconducting magnets alkaline earth cuprate phases bismuth compounds calcium compounds critical current density (superconductivity) edge filaments enhancing current contribution filament numbers filament tapes high critical current high-temperature superconductors lead compounds optimisation optimised process parameters powder technology powder-in-tube method processing conditions silver silver alloys silver ratio silver/superconductor ratios strontium compounds superconducting tapes superconductor core density tape performance