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Scientific article
Open access
English

Development of Ag-Sheated Bi(2223) Tapes with Improved Microstructure and Homogeneity

Published inJournal of Superconductivity, vol. 11, no. 5, p. 489-494
Publication date1998
Abstract

The development of the fabrication process of Ag-sheathed Bi(2223) tapes has been carried out in order to improve their transport and mechanical properties, as required by the power applications which are so far under study. Critical current density values of 28 kA/cm2 at 77 K have been achieved on long multifilamentary Bi(2223) tapes, with a fabrication process that has been successfully employed in the fabrication of samples longer than 50 m. The microstructure and homogeneity of Ag-sheathed multifilamentary Bi(2223) tapes has been markedly improved by employing an alternative deformation technique. In a substantial part of the fabrication process, swaging, drawing, and rolling have been replaced by deformation with an active turks-head machine, which allows the deformation of rectangular shaped wires. At present, critical current densities in excess of 25 kA/cm2 at 77 K have been achieved on long samples prepared with this technique. Moreover, innovative filament configurations have been employed for the fabrication of square-shaped Bi(2223) wires with reduced anisotropy and with critical current densities exceeding 20 kA/cm2 at 77 K.

Keywords
  • Applications of high-Tc superconductivity
  • Power-in-tube process
  • Bi-based superconductors
  • Critical current density
Citation (ISO format)
GRASSO, Giovanni et al. Development of Ag-Sheated Bi(2223) Tapes with Improved Microstructure and Homogeneity. In: Journal of Superconductivity, 1998, vol. 11, n° 5, p. 489–494. doi: 10.1023/A:1022610623765
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Article (Published version)
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ISSN of the journal0896-1107
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