Evolution of core density of Ag-clad Bi-2223 tapes during process

Author

Jiang, J. ; Cai, X.Y. ; Chandler, J.G. ; Rikel, M.O. ; Hellstrom, E.E. ; Parrella, R.D. ; Yu, Dingan ; Li, Q. ; Rupich, M.W. ; Riley, G.N. ; Larbalestier, D.C.

Author_Institution

Appl. Supercond. Center, Wisconsin Univ., Madison, WI, USA

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

3561

Lastpage

3564

Abstract

The porosity and its effect on critical current density J_c of Ag-clad (Bi,Pb)₂Sr₂Ca₂Cu₃O_x (Bi-2223) tapes throughout important steps in their thermomechanical treatment was investigated by using mass density measurement, microstructural observation, and superconducting property characterization. The relative mass density of the final filament for 19 filament tape was less than 75%, even though the J_c is ~50 kA/cm² (77 K, 0 T). The mass density in monofilaments reached 90%, because retrograde densification during the first heat treatment (HT1) was less or even absent. Well textured Bi-2223 grain growth could result in a significant densification during the first HT in the monofilament composite. Our results hint at considerable variability in this important property of Bi-2223 tape

Keywords

bismuth compounds; calcium compounds; composite superconductors; critical current density (superconductivity); crystal microstructure; densification; grain growth; heat treatment; high-temperature superconductors; lead compounds; multifilamentary superconductors; porosity; silver; strontium compounds; superconducting tapes; texture; thermomechanical treatment; (Bi,Pb)₂Sr₂Ca₂Cu₃O _x; (BiPb)₂Sr₂Ca₂Cu₃O; 19 filament tape; 77 K; Ag; Ag-clad Bi-2223 tapes; HTSC; core density; critical current density; heat treatment; mass density; microstructural observation; monofilaments; porosity; processing; relative mass density; retrograde densification; superconducting property characterization; thermomechanical treatment; well textured Bi-2223 grain growth; Critical current; Critical current density; Density measurement; Heat treatment; Microstructure; Multifilamentary superconductors; Powders; Superconducting filaments and wires; Superconducting films; Thermomechanical processes;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919833

Filename

919833