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Open AccessArticle

Effect of CaF2 on the Viscosity and Microstructure of CaO–SiO2–Al2O3 Based Continuous Casting Mold Flux

1
College of Matallurgy and Energy, North China University of Science and Technology, Tangshan 063000, China
2
Hebei Engineering Research Center of High Quality Steel Continuous Casting, Tangshan 063000, China
3
School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(8), 871; https://doi.org/10.3390/met9080871
Received: 10 June 2019 / Revised: 22 July 2019 / Accepted: 5 August 2019 / Published: 8 August 2019
(This article belongs to the Special Issue Mold and Tundish Metallurgy)
In this study, a CaO–SiO2–Al2O3-based continuous casting mold flux was designed using the FactSage thermodynamics software to determine the composition range of CaF2. The viscosity characteristics of the mold flux were determined using a rotating viscometer. The results show that the constant temperature viscosity at 1300 °C decreases gradually as CaF2 content is increased from 3% to 11% in the CaO–SiO2–Al2O3-based slag. Viscosity is reduced from 0.854 to 0.241 Pa·s, viscous the flow activation energy is reduced from 157.74 to 114.34 kJ·mol−1, and the break temperature is reduced from 1280 to 1180 °C. Furthermore, when the CaF2 content is increased from 3% to 11%, the number of nonbridging fluorine bonds (Al–F structure and Si–F structure) in the melt increases to 287, the number of bridging fluorine bonds (Al–F–Al structure, Si–F–Si structure, and Si–F–Si structure) is only 17, and the network rupture of fluorine ions in the system is larger than the network formation. Consequently, both the degree of polymerization and viscosity are reduced. View Full-Text
Keywords: fluorine; mold flux; viscosity; microstructure; continuous casting fluorine; mold flux; viscosity; microstructure; continuous casting
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Wang, X.; Jin, H.; Zhu, L.; Xu, Y.; Liu, R.; Piao, Z.; Qu, S. Effect of CaF2 on the Viscosity and Microstructure of CaO–SiO2–Al2O3 Based Continuous Casting Mold Flux. Metals 2019, 9, 871.

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