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Optimization of processing parameter of (Nb,Ta)[sub 3]Sn superconductors with Ta-Sn core.

Authors :
Tachikawa, K.
Kato, T.
Matsumoto, H.
Kato, R.
Aodai, M.
Takeuchi, T.
Source :
AIP Conference Proceedings; 2002, Vol. 614 Issue 1, p917, 8p
Publication Year :
2002

Abstract

Thick and uniform Nb[sub 3]Sn layers containing Ta with excellent high-field performance are synthesized through the reaction between a Ta-Sn core and a Nb-based alloy sheath. A small amount of Cu addition to the core reduces the reaction temperature. The effect of amount of Cu addition to the core on the reaction temperature, microstructure and high-field performance of the conductor has been studied changing the Ta/Sn composition ratio of the core. A variety of J[sub c] versus magnetic field performance has been obtained by adjusting the amount of Cu addition to the core and the reaction temperature in the present Nb[sub 3]Sn conductors. Furthermore, the effect of the sheath material on the structure and high-field performance of the conductor has been studied. Results obtained in the Nb-2at%Ti sheath specimen were compared with those obtained in the Nb-4at%Ta sheath specimen. A clear line composed of Cu-Ti precipitates separates the Nb[sub 3]Sn layer into two zones, when a small amount of Cu is added to the core of the Nb-2at%Ti sheath specimen. Nb-4at%Ta sheath provides appreciably better high-field performance in the conductor than Nb-2at%Ti sheath does. [ABSTRACT FROM AUTHOR]

Subjects

Subjects :
SUPERCONDUCTORS
ALLOYS

Details

Language :
English
ISSN :
0094243X
Volume :
614
Issue :
1
Database :
Complementary Index
Journal :
AIP Conference Proceedings
Publication Type :
Conference
Accession number :
6666071