Continuous melt processing of Bi-2212/Ag dip coated tapes

Author

Morgan, C.G. ; Henry, B.M. ; Eastell, C.J. ; Goringe, M.J. ; Grovenor, C.R.M. ; Burgoyne, J.W. ; Dew-Hughes, D. ; Priestnall, M. ; Storey, R. ; Jones, H.

Author_Institution

Dept. of Mater., Oxford Univ., UK

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

1711

Lastpage

1714

Abstract

Bi-2212/Ag tapes have been produced using a continuous dip coating and partial melt processing technique. The role of the annealing and melt processing temperatures on the microstructure and current-carrying properties of the tapes are reported. In particular, the effect of a pre-anneal heat treatment on the residual carbon content from the organic binder has been investigated, in order to improve critical currents. These results have been used to optimise the temperature profile of a multiple-zone tube furnace through which continuous melt processing of the tape is possible. Multiple metre lengths of superconducting tape have been produced and wound into coils. Critical currents of 8.3 A in statically processed tapes and 1.9 A in continuously processed tapes have been achieved at 77 K, zero field.

Keywords

annealing; bismuth compounds; calcium compounds; coating techniques; critical current density (superconductivity); crystal microstructure; heat treatment; high-temperature superconductors; silver; strontium compounds; superconducting coils; superconducting tapes; zone melting; zone melting recrystallisation; 1.9 A; 77 K; 8.3 A; Bi-2212/Ag dip coated tapes; Bi-2212/Ag tapes; Bi/sub 2/Sr/sub 2/CaCu/sub 2/O-Ag; annealing; coils; continuous dip coating; continuous melt processing; continuously processed tapes; critical currents; melt processing temperatures; microstructure; multiple-zone tube furnace; organic binder; partial melt processing technique; pre-anneal heat treatment; residual carbon content; statically processed tapes; superconducting tape; temperature profile; Annealing; Critical current; Dip coating; Furnaces; Heat treatment; Melt processing; Microstructure; Superconducting films; Temperature; Wounds;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.620909

Filename

620909