NDLI: Comparative studies on sandwich rolling and flat rolling in processing Ag/Bi-2223 tapes

Content Provider	IEEE Xplore Digital Library
Author	Chen, Wu.M. Guo, Y.C. Fu, X.G. Liu, H.K. Dou, S.X. Apperley, M.
Copyright Year	2002
Abstract	The normal rolling method is commonly used for intermediate mechanical deformation in the powder-in-tube process to make Ag-clad Bi-based superconducting tapes. To compare the effects of different reduction processing on the superconducting properties of Ag/Bi-2223 tapes, the reduction rate dependence of the critical current densities J/sub c/ of tapes processed by three methods, including normal rolling, pressing and "sandwich" rolling, has been systematically studied. Experimental results show that J/sub c/ dependence on the reduction rate for the three processes follows the same law. There is an optimal reduction rate in each case, which gives the highest physical density and the highest J/sub c/. When the reduction rate increases, J/sub c/ initially increases, reaches a maximum and then diminishes. The density-reduction rate follows a corresponding trend. However, the maximum J/sub c/ of the Ag/Bi-2223 tapes made using "sandwich" rolling is 35% higher than is the case for normal rolling even though the tapes in both cases have the same density of the oxide core. XRD analysis shows that the significant difference in J/sub c/ of tapes processed using the three different intermediate deformation procedures cannot be attributed to the phase composition. SEM images show that normally rolled tapes have much higher density of microcracks than "sandwich" rolled tapes. It is evident that the J/sub c/ of a tape is strongly dependent on oxide core density and deformation procedure.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3752
Ending Page	3755
Page Count	4
File Size	1323615
File Format	PDF
ISSN	10518223
Volume Number	11
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superconducting materials Australia Multifilamentary superconductors Telephony Pressing Superconducting films Critical current density X-ray scattering Critical current Employment
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Magneto-optical images of Ag/Bi-2223 tapes processed by flat rolling, sandwich rolling and pressing

Powder-in-tube-processed multifilamentary Bi-(2223) tapes with silver-alloy sheaths

Significantly enhanced critical current density in Bi-2223/Ag multifilamentary tapes by hot pressing

Superconducting joint of reacted Bi-2223/Ag multi-filamentary tapes

Filament bridging and critical current density variation in the cross-section of multifilamentary Bi-2223/Ag tapes

Effect of short processing time on Bi-2223 phase formation kinetics and critical current in Bi-2223/Ag tapes

Magneto-optical images of Ag/Bi-2223 tapes processed by flat rolling, "sandwich" rolling and pressing

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

Transport Critical Current Density of $hbox{Sr}_{0.6}hbox{K}_{0.4}hbox{Fe}_{2}hbox{As}_{2}hbox{/}hbox{Ag}$ Superconducting Tapes Processed by Flat Rolling and Uniaxial Pressing

Comparative studies on sandwich rolling and flat rolling in processing Ag/Bi-2223 tapes

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