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Microstructure evolution of nb_3sn superconductors during diffusion treatment by bronze route

Rare Metals 2012年第5期31卷 446-450页

作者： CHENG Junsheng WANG Qiuliang WANG Hui DAI Yinming Key Laboratory of Applied Superconductivity Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China

The element diffusion process of nb_3sn 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 50~75 h. The stable and solid nb 3 sn 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, nb_3_sn superconductors with good superconducting property were fabricated successfully at 670 °C after 100h heat treatment.

关键词： nb_3sn diffusion treatment bronze route critical current

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GROWTH OF nb_3sn TRANSFORMED FROM nb_6 sn_5

引用

Acta Metallurgica Sinica(English Letters) 1989年第7期2卷 33-40页

作者： LOU Le HU Suhui Shanghai Institute of Metallurgy,Academia Smica,Shanghai,China Shanghai Institute of Metallurgy,Academia Sinica,Shanghai,China

The diffusion process of sn in the transformation of nb_6sn_5 to nb_3sn has been *** experimental results show that the growth of nb_3sn laver is controlled by two processes,i.e. the short range diffusion of sn which is responsihle for the inner layer with large grains,and the long,range diffusion of sn which results in the outer layer with fine *** was found thai grain size depends on the reaction temperature.A model of nb_3sn growth based on the above processes was established and its solution was found to be in good agreement with ex- perimental results.

关键词： diffusion growth microstructure nb_3sn nb_6sn_5

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