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

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 rat...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2017-10, Vol.24 (10), p.1096-1103
Main Authors: Xu, Ying, Yuan, Zhi-peng, Zhu, Li-guang, Han, Yi-hua, Wang, Xing-juan
Format: Article
Language:English
Subjects:
Calcium fluoride
Calcium oxide
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Continuous casting
Corrosion and Coatings
Degree of polymerization
Entrapment
Fluctuations
Glass
High temperature
Materials Science
Metallic Materials
Mold fluxes
Natural Materials
Newtonian fluids
Non Newtonian fluids
Photoelectrons
Raman spectroscopy
Shear stress
Shear thinning (liquids)
Silicon dioxide
Silicon nitride
Slag
Spectroscopy
Spectrum analysis
Surfaces and Interfaces
Thin Films
Thinning
Tribology
Viscometers
Viscosity
X ray photoelectron spectroscopy
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Summary: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.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-017-1500-8