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Influence of Filament Number on Workability and Critical Current Density of Bi-2212/Ag Superconducting Wires

Authors :
Yu-Mi Roh
Ho-Sup Kim
Sang-Soo Oh
Kyu-Jeong Song
Sang-Kil Lee
Dong-Woo Ha
Hong-Soo Ha
Sang-Cheol Kim
Seong-Kuk Park
Rock-Kil Ko
Nam-Jin Lee
Jae-Gun Oh
Tae-Hyung Kim
Source :
IEEE Transactions on Applied Superconductivity. 17:3099-3102
Publication Year :
2007
Publisher :
Institute of Electrical and Electronics Engineers (IEEE), 2007.

Abstract

The important merit of Bi-2212/Ag high Tc superconducting wire is to apply cable as round wire geometry. Bi-2212/Ag wires were fabricated in order to develop Rutherford cable for SMES near the future. Various Ag ratio and various numbers of filaments for PIT (powder-in-tube) process were applied to investigate the workability during drawing and to improve critical current property of the wires. In order to find proper working process, we investigated the variation of drawing stress during working. Post-annealing of Bi-2212/Ag wires at various atmospheres was carried out after main heat-treatment in order to increase critical current density. The results of post-annealing in nitrogen were better than that of post-annealing in oxygen. Jc of Bi-2212/Ag wire was increased as increased maximum temperature,Tm , for partial melting until 890degC, and highest Jc was over than 2000 A/mm2. The shape of grain was observed by SEM to investigate Bi-2212 phase formation in filaments. The critical current density increased in proportion to the increase of Bi-2212/Ag wire's filaments number.

Details

ISSN :
10518223
Volume :
17
Database :
OpenAIRE
Journal :
IEEE Transactions on Applied Superconductivity
Accession number :
edsair.doi...........3442318d8e64a4f89bc52ab647f95eb1