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Effects of CaO/SiO2 Ratio and Na2O Content on Melting Properties and Viscosity of SiO2-CaO-Al2O3-B2O3-Na2O Mold Fluxes

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Abstract

This paper investigated the effects of CaO/SiO2 ratio (0.8 to 1.5) and Na2O concentration (6 to 9 wt pct) on melting properties and viscosity of SiO2-CaO-Al2O3-B2O3-Na2O mold fluxes with a fixed B2O3 content. Melting properties of fluxes (softening temperature T s, hemispherical temperature T h, and fluidity temperature T f) were determined by the hot-stage microscopy method. Viscosity was measured using rotating cylindrical viscometer, and structure of quenched fluxes was studied using Raman spectroscopy. Equilibrium phases in the SiO2-CaO-Al2O3-B2O3-Na2O system were calculated using FactSage. It was found that T h decreased with increasing CaO/SiO2 ratio from 0.8 to 1.0 and increased with a further increase in the CaO/SiO2 ratio to 1.5. The effect of Na2O content in the range of 6 to 9 wt pct on T h of the flux with a fixed CaO/SiO2 ratio at 1.3 was marginal. Increasing CaO/SiO2 ratio and Na2O content increased the break temperature and reduced the value of viscosity at 1673 K (1400 °C). Viscosity of liquid fluxes was discussed in the relationship with the flux structure. Melting properties and viscosity of boracic fluxes were compared with those of industrial fluorine-containing mold fluxes.

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Acknowledgments

This project was financially supported by Baosteel through BAJC, Abel Metal, and Australian Research Council (ARC LP130100773).

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Authors and Affiliations

  1. School of Materials Science and Engineering, UNSW Australia, Sydney, 2052, Australia

    Lin Wang (Ph. D. Candidate), Jianqiang Zhang (Associate Professor), Yasushi Sasaki (Visiting Professor) & Oleg Ostrovski (Emeritus Professor)

  2. Steelmaking Research Department, Baosteel Group Corporation Research Institute, Shanghai, 201900, China

    Chen Zhang (Senior Research Fellow) & Dexiang Cai (Senior Research Fellow)

Authors
  1. Lin Wang
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  2. Chen Zhang
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  3. Dexiang Cai
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  4. Jianqiang Zhang
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  5. Yasushi Sasaki
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  6. Oleg Ostrovski
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Correspondence to Jianqiang Zhang.

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Manuscript submitted June 29, 2016.

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Wang, L., Zhang, C., Cai, D. et al. Effects of CaO/SiO2 Ratio and Na2O Content on Melting Properties and Viscosity of SiO2-CaO-Al2O3-B2O3-Na2O Mold Fluxes. Metall Mater Trans B 48, 516–526 (2017). https://doi.org/10.1007/s11663-016-0816-5

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  • DOI: https://doi.org/10.1007/s11663-016-0816-5

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