DocumentCode :
1478506
Title :
Microstructure and current-voltage characteristics of bronze processed niobium tin composites
Author :
Kimmich, R. ; Hornung, F. ; Rimikis, A. ; Schneider, Th ; Lee, P.J.
Author_Institution :
Inst. fur Tech. Phys., Forschungszentrum Karlsruhe, Germany
Volume :
11
Issue :
1
fYear :
2001
fDate :
3/1/2001 12:00:00 AM
Firstpage :
3675
Lastpage :
3678
Abstract :
Bronze route conductors are widely used for high field purposes. To shift their limits to even higher fields it is decisive to understand the role that microstructure plays in controlling the current-voltage characteristic. Microstructural properties of Nb3Sn are crucially determined by the reaction heat treatment. Therefore, several heat treatments on samples of a commercial composite were performed. The reaction temperatures extend from 600°C up to 750°C. SEM micrographs were taken from filaments at different positions within the samples. These micrographs were used to carry out a quantitative analysis of grain size. To investigate the connection of microstructural and electrical properties, resistive measurements of the current-voltage characteristic at magnetic fields up to 15 T and 4.2 K were performed
Keywords :
critical currents; crystal microstructure; grain size; heat treatment; multifilamentary superconductors; niobium alloys; scanning electron microscopy; tin alloys; type II superconductors; 15 T; 4.2 K; Nb3Sn; SEM; bronze route conductors; composite wires; current-voltage characteristics; grain size; heat treatment; microstructure; Conductors; Current-voltage characteristics; Grain size; Heat treatment; Magnetic analysis; Magnetic field measurement; Microstructure; Niobium; Temperature; Tin;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/77.919862
Filename :
919862
Link To Document :
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