Wetting behavior of CaO–Al<sub>2</sub>O<sub>3</sub>-based mold flux with various BaO and MgO contents on the steel substrate

Lejun Zhou; Hao Luo; Wanlin Wang; Houfa Wu; Erzhuo Gao; You Zhou; Daoyuan Huang

doi:10.1007/s12613-021-2300-8

Volume 29 Issue 6

Jun. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(6): 1179-1185

Lejun Zhou, Hao Luo, Wanlin Wang, Houfa Wu, Erzhuo Gao, You Zhou, and Daoyuan Huang, Wetting behavior of CaO–Al₂O₃-based mold flux with various BaO and MgO contents on the steel substrate, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1179-1185. https://doi.org/10.1007/s12613-021-2300-8

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Lejun Zhou, Hao Luo, Wanlin Wang, Houfa Wu, Erzhuo Gao, You Zhou, and Daoyuan Huang, Wetting behavior of CaO–Al2O3-based mold flux with various BaO and MgO contents on the steel substrate, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1179-1185. https://doi.org/10.1007/s12613-021-2300-8

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Research Article

Wetting behavior of CaO–Al₂O₃-based mold flux with various BaO and MgO contents on the steel substrate

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Corresponding author:
Wanlin Wang E-mail: wanlin.wang@gmail.com
Received: 19 January 2021; Revised: 16 April 2021; Accepted: 7 May 2021; Available online: 8 May 2021

Abstract

Abstract

The interfacial phenomena in mold have a great impact on the smooth operation of continuous casting process and the quality of the casting product. In this paper, the wetting behavior of CaO–Al₂O₃-based mold flux with different BaO and MgO contents was studied. The results showed that the contact angle between molten flux and interstitial free (IF) steel substrate increased from 62.4° to 74.5° with the increase of BaO content from 3wt% to 7wt%, while it decreased from 62.4° to 51.3° with the increase of MgO content from 3wt% to 7wt%. The interfacial tension also increased from 1630.3 to 1740.8 mN/m when the BaO content increased, but it reduced from 1630.3 to 1539.7 mN/m with the addition of MgO. The changes of contact angle and interfacial tension were mainly due to the fact that the bridging oxygen (O⁰) at the interface was broken into non-bridging oxygen (O⁻) and free oxygen (O²⁻) by MgO. However, more O⁻ and O²⁻ connected into O⁰ when BaO was added, since the charge compensation effect of BaO was so stronger that it offset the effect of providing O²⁻.
- mold flux;
- wetting;
- contact angle;
- interfacial tension;
- melt structure;
- continuous casting

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