Shear-thinning behavior of the CaO-SiO2-CaF2-Si3N4 system mold flux and its practical application

Ying Xu; Zhi-peng Yuan; Li-guang Zhu; Yi-hua Han; Xing-juan Wang

doi:10.1007/s12613-017-1500-8

Volume 24 Issue 10

Oct. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(10): 1096-1103

Ying Xu, Zhi-peng Yuan, Li-guang Zhu, Yi-hua Han, and Xing-juan Wang, Shear-thinning behavior of the CaO-SiO₂-CaF₂-Si₃N₄ system mold flux and its practical application, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1096-1103. https://doi.org/10.1007/s12613-017-1500-8

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Ying Xu, Zhi-peng Yuan, Li-guang Zhu, Yi-hua Han, and Xing-juan Wang, Shear-thinning behavior of the CaO-SiO2-CaF2-Si3N4 system mold flux and its practical application, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1096-1103. https://doi.org/10.1007/s12613-017-1500-8

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Research Article

Shear-thinning behavior of the CaO-SiO₂-CaF₂-Si₃N₄ system mold flux and its practical application

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Corresponding author:
Zhi-peng Yuan E-mail: yuan_zhi_peng@126.com
Received: 16 February 2017; Revised: 17 May 2017; Accepted: 31 May 2017

Abstract

Abstract

Satisfying the mold-flux performance requirements for high-speed continuous casting necessitates the development of a new non-Newtonian-fluid mold flux with shear-thinning behavior, i.e., a mold flux whose viscosity is relatively high under lower shear rates and relatively low under higher shear rates. In this work, a mold flux that exhibits shear-thinning behavior was developed by adding different amounts of Si₃N₄ to the CaO-SiO₂-CaF₂ mold flux. The shear-thinning behavior was investigated using a rotational viscometer. In addition, the microstructure of the newly prepared slags was studied by high-temperature Raman spectroscopy and X-ray photoelectron spectroscopy. The results showed that the mechanism of shear-thinning was attributable to a temporary viscosity loss caused by the one-way shear stress, whereas the corresponding magnitude of shear-thinning was closely related to the degree of polymerization (DP). Finally, the non-Newtonian fluid mold flux was used for laboratory casting tests, which revealed that the mold flux could reduce slag entrapment and positively affect the continuous casting optimization.
- mold flux;
- viscosity;
- shear-thinning behavior;
- non-Newtonian fluid;
- degree of polymerization

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