NDLI: Effect of powder pre-annealing on microstructural development inside Bi2223/Ag-sheathed tapes

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Effect of powder pre-annealing on microstructural development inside Bi2223/Ag-sheathed tapes

Content Provider	Semantic Scholar
Author	Chen, Xiang Han, Zhongying Grivel, J.-C. Xu, Gaojie J. Andersen, Niels Hessel Homeyer, Jens
Copyright Year	2005
Abstract	Processing (Bi,Pb)2Sr2Ca2Cu3O10 (Bi2223)/Ag superconducting composite tapes with cross sections of approximately 3 x 0.2 mm requires several steps including two or three heat treatments at 830 840°C with intermediate mechanical densification. Among these steps, the first heat treatment plays a key role. The powder, which is initially packed into Ag-tubes with a few mm diameter, does not consist of the Bi2223 phase yet. Instead, a structurally related compound (Bi,Pb)2Sr2Ca1Cu2O8 (Bi2212) is the predominant phase. The Pb included in the nominal composition can be present under various forms depending on the details of the powder preparation process: a) in the Ca2PbO4 phase, b) in the Pb3Sr2.5Bi0.5Ca2CuOy ("3321") phase, c) incorporated in Bi2212. The powder preparation process determines the phase assembly, which in turn has an influence on the phase and microstucture development inside the tapes during further processing. Three tapes were prepared with powders correspong to cases a, b and c as described above in order to study the possible influence of the Pb location in the starting mixture. The properties studied include the microstrucure, in particular the preferential orientation induced in the ceramic powder during deformation of the Ag sheath from a tube to a tape with high aspect ratio, as well as its development during the first heat treatment.
Starting Page	213
Ending Page	214
Page Count	2
File Format	PDF HTM / HTML
DOI	10.1007/s10853-005-5710-5
Alternate Webpage(s)	http://hasyweb.desy.de/science/annual_reports/2003_report/part1/contrib/41/10060.pdf
Alternate Webpage(s)	https://doi.org/10.1007/s10853-005-5710-5
Volume Number	40
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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