Effect of MgO on microstructure of CaO-Al2O3 based quaternary system mold fluxes
LIU Ke1,2, HAN Yi-hua1,2, YANG Fan1,2, ZHU Li-guang2,3
1. College of Metallurgy and Energy, North China University of Science and Technology, Tangshan 063210, Hebei, China; 2. Hebei Engineering Research Center of High Quality Steel Continuous Casting, Tangshan 063000, Hebei, China; 3. School of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, China
Abstract：In order to study the influence of MgO on the microstructure of CaO-Al2O3-B2O3-MgO quaternary slag system,the slag network structure model of CaO-Al2O3-B2O3-MgO-based quaternary slag system was constructed by Scigress molecular dynamics software. The results demonstrated that high-coordinated Al and tri-coordinate oxygen appear in the molten slag to compensate for [AlO4]5- tetrahedral negative charge excess;Boron as the network forming body has the strongest binding ability with O,and its coordination structure exists as Tri-coordinated trigonal and tetra-coordinated tetrahedrons;MgO acts as a network modifiers to compensate for charge and depolymerization networks. With the increasing of MgO content,the stability of the Al—O network structure enhanced,while the degree of polymerization of the melt and the complexity of the network structure decreased.
刘克, 韩毅华, 杨帆, 朱立光. MgO对CaO-Al2O3基四元系保护渣熔渣微结构的影响[J]. 钢铁, 2020, 55(5): 52-58.
LIU Ke, HAN Yi-hua, YANG Fan, ZHU Li-guang. Effect of MgO on microstructure of CaO-Al2O3 based quaternary system mold fluxes. Iron and Steel, 2020, 55(5): 52-58.
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2020, Vol. 55 
