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The influence of substrate and atmosphere on the properties of FeSiB(Cu,Nb) alloy melts

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Abstract

The surface tensions and contact angles of Fe78Si9B13 and Fe73.5Cu1Nb3Si13.5B9 alloy melts were studied as a function of temperature in various atmospheres (vacuum, Ar and N2 gas) and on different substrates (SiC, Al2O3 and BN). It is indicated that Si3N4, NbN, Fe2AlB and B13C2 are generated as new phases at the interface between the melt and substrate, and reactive wetting behaviour exists during the heating process. The surface tensions of two alloy melts on BN substrate both firstly decrease and then increase along with increasing temperature, leading to V-shaped surface tension versus temperature, which results from atomic diffusion effects in the surface layer during the oxidation of BN and formation of C-rich layer. Comparably, the surface tensions on Al2O3 and SiC substrates decrease with increasing temperature throughout the entire temperature range. Among three substrates, BN exhibits the mildest wetting behaviour. The vacuum environment has the strongest protective effect on melt stability among the tested atmospheres. These findings enrich our knowledge about the effects of the substrate and atmosphere on Fe-based alloy melts at a high temperature, and provide theoretical reference for designing jet nozzles in melt-spinning techniques.

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Correspondence to BangShao Dong or ShaoXiong Zhou.

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Gao, H., Dong, B., Zhong, J. et al. The influence of substrate and atmosphere on the properties of FeSiB(Cu,Nb) alloy melts. Sci. China Technol. Sci. 59, 1892–1898 (2016). https://doi.org/10.1007/s11431-016-0016-7

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  • DOI: https://doi.org/10.1007/s11431-016-0016-7

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