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Effect of Al2O3/(B2O3 + Na2O) Ratio on CaO-Al2O3-Based Mold Fluxes: Melting Property, Viscosity, Heat Transfer, and Structure

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Abstract

CaO-Al2O3-based mold fluxes, which are under development for the continuous casting of high-Al steel, contain fluxing compounds, such as Na2O and B2O3. The reaction between [Al] and the fluxing agents in mold fluxes leads to an increase in Al2O3 and a decrease in B2O3 and Na2O concentrations, changing the properties of mold fluxes. The effect of the Al2O3/(B2O3 + Na2O) ratio on the melting properties, viscosity, heat transfer, and structure of the CaO-Al2O3-based mold fluxes is presented in this work. The increase of the Al2O3/(B2O3 + Na2O) ratio in the fluxes raised the melting temperature and high-temperature viscosity of mold fluxes but decreased the heat transfer rate across the flux disks. It also enhanced the degree of polymerization by promoting the formation of 3-D aluminate structure, which accounted for the change of the viscous behavior.

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Acknowledgments

Financial supports from Baosteel-Australia Joint Research and Development Centre (BAJC) (BA16006) and Australian Research Council (ARC) Industrial Transformation Hub (IH140100035) are greatly acknowledged. The authors also would like to acknowledge Dr Aditya Rawal of the NMR Facility within the Mark Wainwright Analytical Centre at the University of New South Wales for NMR support.

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Correspondence to Jianqiang Zhang.

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Manuscript submitted 21 May, 2019.

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Yang, J., Wang, Q., Zhang, J. et al. Effect of Al2O3/(B2O3 + Na2O) Ratio on CaO-Al2O3-Based Mold Fluxes: Melting Property, Viscosity, Heat Transfer, and Structure. Metall Mater Trans B 50, 2794–2803 (2019). https://doi.org/10.1007/s11663-019-01711-z

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