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Study of the Viscosity of Mold Flux Based on the Vogel–Fulcher–Tammann (VFT) Model

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Abstract

Viscosity is one of the most important properties of mold flux and affects the process of continuous casting significantly. In order to describe the variation of viscosity of mold flux accurately in a wide range of temperature occurring in the casting mold, a non-Arrhenius Vogel–Fulcher–Tammann (VFT) model was adopted in this study. The results showed that the adjusted coefficient of determination (Adj. R 2) of non-Arrhenius VFT Model ranges from 0.92 to 0.96, which suggests this model could be well adapted to predict the relationship between viscosity and temperature of mold flux. The temperature at which viscosity becomes infinite, T VFT, increased with the addition of Cr2O3 and improvement of basicity, while it decreased with the addition of B2O3, as it was determined by both the degree of polymerization of the melt structure and crystallization behavior of the melt. Also, the pseudo-activation energy, E VFT, of Samples 1 to 5 was 60.1 ± 3.6, 94.7 ± 14.9, 101.7 ± 19.0, 38.0 ± 4.8, and 32.4 ± 4.0 kJ/mol, respectively; it increased with the addition of Cr2O3 and B2O3, but deceased with the increase of basicity.

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Acknowledgments

This work was financially supported by the National Science Foundation of China (51504294, 51322405), and the China Postdoctoral Science Foundation (2016T90760) is also great acknowledged.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, P.R. China

    Lejun Zhou (Lecturer) & Wanlin Wang (Lotus Professor, Director of National Center for International Research of Clean Metallurgy)

  2. School of Metallurgy and Environment, National Center for International Research of Clean Metallurgy, Central South University, Changsha, P.R. China

    Wanlin Wang (Lotus Professor, Director of National Center for International Research of Clean Metallurgy)

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  1. Lejun Zhou
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  2. Wanlin Wang
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Correspondence to Wanlin Wang.

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Manuscript submitted May 23, 2016.

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Zhou, L., Wang, W. Study of the Viscosity of Mold Flux Based on the Vogel–Fulcher–Tammann (VFT) Model. Metall Mater Trans B 48, 220–226 (2017). https://doi.org/10.1007/s11663-016-0835-2

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