Effect of the sinter-forging deformation rate on properties of Bi-2223 current leads

Author

Fu, X.K. ; Guo, Y.C. ; Chen, W.M. ; Liu, H.K. ; Dou, S.X.

Author_Institution

Inst. of Supercond. & Electron. Mater., Wollongong Univ., NSW, Australia

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

2551

Lastpage

2554

Abstract

The influence of the sinter-forging rate on the critical current density (J_c) behaviour in an external field and on the contact resistance R_c for Bi-2223 current leads has been investigated. The current leads were fabricated by a combination of cold isostatic pressing (CIP) and sinter-forging methods with the thickness reduction rate ranging from 0% to 90%. The two silver contact terminals of each sample were also prepared during the sinter-forging. The results revealed that J_c was strongly affected by the deformation rate of sinter-forging and reached a maximum of 725 A/cm² at a deformation rate of 80%. From the measurements of the external magnetic field dependence on J_c. It was determined that sinter-forging could improve the J_c behaviour in external fields, particularly in the regime below 10×10^-13 Tesla (i.e. 10 mT). The measurements of the contact resistance R_c were conducted for different transport currents at 77 K. The results showed that the contact resistance for the samples with higher deformation rates became less dependent on the transport current over a range of 0.5 A to 50 A

Keywords

bismuth compounds; calcium compounds; copper compounds; critical current density (superconductivity); forging; high-temperature superconductors; lead compounds; magnetic fields; sintering; strontium compounds; superconducting cables; (BiPb)₂Sr₂Ca₂Cu₃O ₁₀; (BiPb)₂Sr₂Ca₂Cu₃O ₁₀ HTSC current lead properties; 0.5 to 50 A; 77 K; Bi-2223 current leads; cold isostatic pressing; contact resistance; critical current density behaviour; external magnetic field; silver contact terminals; sinter-forging deformation rate; thickness reduction rate; transport currents; Australia; Contact resistance; Critical current density; Density measurement; Electrical resistance measurement; High temperature superconductors; Magnetic field measurement; Superconducting magnetic energy storage; Superconducting materials; Telephony;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.920388

Filename

920388