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Viscosity and surface tension of CaF2–CaO–Al2O3-based slag with varying SiO2 and B2O3 contents for ESR of rotor steel

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Abstract

The effect of SiO2 and B2O3 on viscosity and surface tension of CaF2–CaO–Al2O3–MgO–SiO2–B2O3 slag designed for electroslag remelting of rotor steel was investigated. The viscosity of the slag melts increases with increasing the SiO2 content from 0.37 to 8.03 mass%, and the viscous activation energy increases from 54.21 to 58.49 kJ/mol. Increasing B2O3 content of the slag from 0 to 3.62 mass% exhibits a similar effect on the viscosity, and the activation energy increases from 47.30 to 55.71 kJ/mol. The increase in the viscosity and activation energy for viscous flow of slag is attributed to the enhanced polymerization degree of slag melts network with increasing either SiO2 or B2O3 content. The surface tension of slag melts decreases with increasing temperature. The surface tension of slag melts decreases with increasing either SiO2 or B2O3 content, which is originated from the increase in the polymerization degree and the decrease in the CaO content of the slag.

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Acknowledgements

The financial support by the National Natural Science Foundation of China (Grant Nos. 52074027 and 51874026) is greatly acknowledged.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Yi Huang, Cheng-bin Shi, Xiu-xiu Wan, Yu-jing Liang & Jing Li

  2. Xingtai Shuzhi Metallurgy Technology Co., Ltd., Xingtai, 054027, Hebei, China

    Shu-jie Liu

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  1. Yi Huang
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Correspondence to Cheng-bin Shi.

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Huang, Y., Shi, Cb., Wan, Xx. et al. Viscosity and surface tension of CaF2–CaO–Al2O3-based slag with varying SiO2 and B2O3 contents for ESR of rotor steel. J. Iron Steel Res. Int. 30, 74–81 (2023). https://doi.org/10.1007/s42243-022-00861-w

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  • DOI: https://doi.org/10.1007/s42243-022-00861-w

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