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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International Journal of Minerals, Metallurgy and Materials > 2017 > 24(10): 1096-1103. > DOI: 10.1007/s12613-017-1500-8

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://dx.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

Ying Xu¹⁾,
Zhi-peng Yuan^2), ,,
Li-guang Zhu²⁾,
Yi-hua Han²⁾ and
Xing-juan Wang²⁾

Author Affilications

Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, College of Materials Science and Engineering, North China University of Science and Technology, Tangshan 063009, China
Key Laboratory for Advanced Metallurgy Technology, Hebei Provincial High-Quality Steel Continuous Casting Engineering Technology Research Center, College of Metallurgy & Energy, North China University of Science and Technology, Tangshan 063009, China

Funds:

This work was financially supported by the National Natural Science Foundation of China (Nos. 51574109 and 51604119).

Received: 15 February 2017; Revised: 16 May 2017; Accepted: 30 May 2017;

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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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References (26)

References

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