Shear-thinning behavior of the CaO-SiO2-CaF2-Si3N4 system mold flux and its practical application |
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| Authors: | Ying Xu Zhi-peng Yuan Li-guang Zhu Yi-hua Han Xing-juan Wang |
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| Institution: | 1. Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials,College of Materials Science and Engineering,North China University of Science and Technology,Tangshan 063009,China;2. 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 |
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| 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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| Keywords: | mold flux viscosity shear-thinningbehavior non-Newtonian fluid degree of polymerization |
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