Processing, microstructure and critical current density of 2223 BPSCCO/Ag tapes

Author

Fischer, K. ; Schubert, M. ; Rodig, C. ; Verges, P. ; Neumuller, H.-W. ; Wilhelm, M. ; Roas, B. ; Jenovelis, A.

Author_Institution

Inst. fur Festkorper- & Werkstofforschung Dresden e.V., Germany

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1259

Lastpage

1262

Abstract

Progress has been made in the development of long 2233 phase multifilamentary wire tapes using the powder-in-tube technique. Ramless extrusion was successfully used to deform multifilamentary precursor/Ag-composites of large diameter. After extrusion and wire drawing the mean variation coefficient of filament cross sections along the wire length was determined to be about 10%. Studies of 2223 phase formation in the wire cores have shown, that the conversion of the precursor to 2223 has been accelerated by annealing under reduced O/sub 2/ pressure compared with air. Critical current densities of 12 kA/cm/sup 2/ and about 5 kA/cm/sup 2/ (77 K; 0 T) were achieved for the 19 filament wire tapes of 17 m and 100 m length, respectively. J/sub c/ of tapes of 0.12 mm thickness has been suppressed around a strain value of 0.1%.<>

Keywords

annealing; bismuth compounds; calcium compounds; critical current density (superconductivity); crystal microstructure; deformation; drawing (mechanical); extrusion; high-temperature superconductors; lead compounds; multifilamentary superconductors; powder technology; silver; strontium compounds; superconducting tapes; 2223 phase; 77 K; BiPbSrCaCuO-Ag; BiPbSrCaCuO/Ag tapes; annealing; composite superconductor; critical current density; deformation; filament cross sections; microstructure; multifilamentary wire tapes; powder-in-tube technique; precursor; processing; ramless extrusion; reduced O/sub 2/ pressure; strain value; wire cores; wire drawing; Acceleration; Annealing; Billets; Capacitive sensors; Critical current density; Heat treatment; High temperature superconductors; Microstructure; Powders; Wire drawing;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402790

Filename

402790