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Volume 24 Issue 10
Oct.  2017
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文章导航 >  矿物冶金与材料学报（英文）  > 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
Cite this article as:
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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研究论文

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

  • 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

  • 通讯作者:

    Zhi-peng Yuan    E-mail: yuan_zhi_peng@126.com

  • 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.
    • Research Article

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

    + Author Affiliations
      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.
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