Advances in the development of silver sheathed (Bi,Pb)2223 composite conductors

Author

Carter, W.L. ; Riley, G.N., Jr. ; Otto, A. ; Parker, D.R. ; Christopherson, C.J. ; Masur, L.J. ; Buczek, D.

Author_Institution

American Supercond. Corp., Westborough, MA, USA

Volume

5

Issue

2

fYear

1995

fDate

6/1/1995 12:00:00 AM

Firstpage

1145

Lastpage

1149

Abstract

Significant advances have been made in the critical current density of the technologically interesting (Bi,Pb)2223 composite conductors. Engineering current density, J/sub e/, of 9100 A/cm/sup 2/, corresponding to a filament current density, J/sub c/, of 32600 A/cm/sup 2/ (77 K, self-field) has been achieved by increasing the fraction of oxide in the conductor and improving the thermomechanical processing of the conductor. The filament microstructure may be further optimized by decreasing the volume fraction of secondary phases and porosity. The strain tolerance of the higher oxide fraction conductors remains adequate for applications by increasing the number of filaments in the conductors. Composite tapes with twisted filaments have been produced that have promising electrical properties in applied magnetic fields.<>

Keywords

bismuth compounds; calcium compounds; critical current density (superconductivity); deformation; high-temperature superconductors; lead compounds; materials preparation; multifilamentary superconductors; powder technology; silver; strontium compounds; thermomechanical treatment; (BiPb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub 10/-Ag; Ag sheathed composite conductors; composite tapes; critical current density; filament current density; filament microstructure; high temperature superconductor; porosity; secondary phases; strain tolerance; thermomechanical processing; Billets; Conducting materials; Conductors; Current density; Magnetic field induced strain; Powders; Silver; Superconducting filaments and wires; Superconducting materials; Thermomechanical processes;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.402764

Filename

402764