The affect of transients on secondary phase formation in multifilamentary (Bi, Pb)2223/Ag composite tape
The affect of transients on secondary phase formation in multifilamentary (Bi, Pb)2223/Ag composite tape
The processing of (Bi, Pb)2223 tapes has been investigated extensively since the first OPIT tapes were made in 1989. The formation of Bi-2223 is via a Pb-induced liquid phase, which is known to assist the Bi-2223 formation. However, there are many unsolved microstructural inhomogeneities and defects in current OPIT tape; consequently research has begun to focus on the role of the liquid phase. In this study differential thermal analysis results on green (Bi, Pb)2223 tape in 7.5% pp O2 give direct evidence for two phase transitions, with onset temperatures of 800 and 820 °C. XRD phase analysis on tapes heat treated for prolonged periods show two distinct secondary phase formation regions: between 800 and 820 °C; and above 820 °C. A link is drawn between the phase transitions in the initial stages of Bi-2223 formation and the long-term secondary phase formation. The relevance of these results to transport properties is discussed.
571-574
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Avgeros, S.
5fe69264-5fe3-4431-812b-952a9a5c3ec4
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
2004
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Avgeros, S.
5fe69264-5fe3-4431-812b-952a9a5c3ec4
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Young, E.A., Avgeros, S. and Yang, Y.
(2004)
The affect of transients on secondary phase formation in multifilamentary (Bi, Pb)2223/Ag composite tape.
Superconductor Science and Technology, 17 (3), .
(doi:10.1088/0953-2048/17/3/044).
Abstract
The processing of (Bi, Pb)2223 tapes has been investigated extensively since the first OPIT tapes were made in 1989. The formation of Bi-2223 is via a Pb-induced liquid phase, which is known to assist the Bi-2223 formation. However, there are many unsolved microstructural inhomogeneities and defects in current OPIT tape; consequently research has begun to focus on the role of the liquid phase. In this study differential thermal analysis results on green (Bi, Pb)2223 tape in 7.5% pp O2 give direct evidence for two phase transitions, with onset temperatures of 800 and 820 °C. XRD phase analysis on tapes heat treated for prolonged periods show two distinct secondary phase formation regions: between 800 and 820 °C; and above 820 °C. A link is drawn between the phase transitions in the initial stages of Bi-2223 formation and the long-term secondary phase formation. The relevance of these results to transport properties is discussed.
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Published date: 2004
Additional Information:
First of two papers concluding a few years of progressive work. Contributes not only to the engineering of Bi-2223 tapes, which has a short-term relevance for high current applications, but also in the longer term towards a poorly understood and complicated area of materials science.
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Local EPrints ID: 22642
URI: http://eprints.soton.ac.uk/id/eprint/22642
ISSN: 0953-2048
PURE UUID: 269be956-9606-49f3-9afb-5dc1cf87cfd4
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Date deposited: 21 Mar 2006
Last modified: 16 Mar 2024 02:44
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Author:
S. Avgeros
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