Microstructure evolution of Nb sub(3)Sn superconductors during diffusion treatment by bronze route

The element diffusion process of Nb sub(3)Sn superconductors by bronze route was studied using X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The critical current of superconductors was measured by four-point method. The results show that a diffusion layer has fo...

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Bibliographic Details
Published in:Rare metals 2012-10, Vol.31 (5), p.446-450
Main Authors: Cheng, Junsheng, Wang, Qiuliang, Wang, Hui, Dai, Yinming
Format: Article
Language:English
Subjects:
Bronzes
Coarsening
DIFFUSION
Diffusion layers
ELECTRICAL CONDUCTIVITY
Filaments
HEAT TREATING
Heat treatment
MICROSTRUCTURES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
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Summary:The element diffusion process of Nb sub(3)Sn superconductors by bronze route was studied using X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The critical current of superconductors was measured by four-point method. The results show that a diffusion layer has formed around the boundaries between the filaments and bronze matrix after 15 h heat treatment. The diffusion layer thickness keeps stable after heat treatment duration of 5075 h. The stable and solid Nb3Sn layer is obtained in the sample after 100 h heat treatment. Excessive heat treatment would induce superconductivity degeneration because of superconductor grain coarsening. The characteristics of the element diffusion process were discussed. The diffusion of tin atom is the governing factor in diffusion. In this study, Nb3Sn superconductors with good superconducting property were fabricated successfully at 670 degree C after 100 h heat treatment.
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-012-0537-0