A comparative study of microstructure and transport critical current in cold rolled, cold uniaxially pressed and low load hot uniaxially pressed Ag-(Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ tape

Author

James, M.P. ; Glowacki, B.A. ; Evetts, J.E. ; Ashworth, S.P. ; Garre, R. ; Conti, S.

Author_Institution

Interdisciplinary Res. Centre in Superconductivity, Cambridge Univ., UK

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1838

Lastpage

1841

Abstract

The microstructure and transport critical current of cold rolled, cold uniaxially pressed, and low load hot uniaxially pressed Ag-(Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/, tape has been investigated. The transverse and longitudinal transport current measurements show strong correlation with morphological non-uniformities induced by the cold deformation processes. The aim of low load hot uniaxial pressing is to increase the density of the ceramic core and reduce the anisotropic nature of the critical current induced during the cold deformation processes. The deformation mechanisms of the silver and ceramic core when under load have been studied, and a deformation mechanism map has been constructed. Experimental investigation of the low load region over a range of temperatures has been carried out.<>

Keywords

bismuth compounds; calcium compounds; cold rolling; critical currents; crystal microstructure; high-temperature superconductors; hot pressing; lead compounds; materials preparation; silver; strontium compounds; superconducting tapes; Ag-(Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ tape; Ag-(BiPb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O; anisotropic nature; ceramic core; cold deformation; cold rolled tape; cold uniaxially pressed tape; high temperature superconductors; longitudinal transport current; low load hot uniaxially pressed tape; microstructure; morphological nonuniformities; strong correlation; transport critical current; transverse transport current; Ceramics; Conducting materials; Critical current; Materials science and technology; Microstructure; Powders; Pressing; Proposals; Silver; Superconductivity;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402938

Filename

402938