MgO对CaO-Al<sub>2</sub>O<sub>3</sub>基四元系保护渣熔渣微结构的影响

doi:10.13228/j.boyuan.issn0449-749x.20190357

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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.

Key words： mold fluxes CaO-Al₂O₃-B₂O₃-MgO molecular dynamics microstructure

Received: 01 August 2019

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	LIU Ke
	HAN Yi-hua
	YANG Fan
	ZHU Li-guang

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LIU Ke,HAN Yi-hua,YANG Fan等. Effect of MgO on microstructure of CaO-Al₂O₃ based quaternary system mold fluxes[J]. Iron and Steel, 2020, 55(5): 52-58.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190357 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I5/52

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