Fabrication and characterization of Ag-clad Bi-2223 tapes. Page: 4 of 15
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FABRICATION AND CHARACTERIZATION OF Ag-CLAD Bi-2223 TAPES*
U. Balachandran, M. Lelovic, and B. C. Prorok
Argonne National Laboratory
Argonne, IL 60439
V. Selvamanickam and P. Haldar
Intermagnetics General Corporation
Latham, NY 12110
ABSTRACT
The powder-in-tube (PIT) technique was used to fabricate multifilament
(Bi,Pb)2Sr2Ca2Cu3Oy (Bi-2223) superconducting tapes. Transport current
properties of these tapes were enhanced by increasing the packing density of the
precursor powder and improving the mechanical deformation condition. A
critical current (Ic) of > 35 A in long lengths (> 200 m) tapes has been achieved.
In measuring the dependence of critical current density on magnetic field and
temperature for the optimally processed tapes, we found a Jc of >104 A/cm2 at 20
K in magnetic fields up to 3 T and parallel to the c-axis, which is of interest for
use in refrigerator-cooled magnets. Ic declined exponentially when an external
field was applied perpendicular to the tape surface at 77 K. Mechanical stability
was tested for tapes sheathed with pure Ag and Ag-Mg alloy. Tapes made with
pure Ag sheathing can withstand a tensile stress of =20 MPa with no detrimental
effect on Ic values. Mechanical performance was improved by using Ag-Mg alloy
sheathing: values of transport critical current began to decrease at the tensile
stress of = 100 MPa. Transport current measurements on tapes wound on a
mandrel of 3.81 cm (1.5 in.) diameter at 30* to the longitudinal axis, showed a
reduction of =10% in Ic values for pure Ag-sheathed tapes and 5% reduction in
Ic values for Ag-Mg sheathed tapes, compared with the Ic values of as-coiled-
tapes.
*This work was supported by the U.S. Department of Energy (DOE), Energy Efficiency and
Renewable Energy, as part of a DOE program to develop electric power technology, under
Contract W-31-109-Eng-38.
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Balachandran, U. Fabrication and characterization of Ag-clad Bi-2223 tapes., article, April 20, 1999; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc620074/m1/4/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.