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Abstract <p>The knowledge of the thermodynamics and phase equilibria of the FeO–MnO–MgO–SiO<sub>2</sub> silicate melts and MnO–MgO–SiO<sub>2</sub> silicate solid solutions allows one to predict the appearance of nonmetallic inclusions in steel in the presence of silicon, manganese, and magnesium. The FeO–MnO–MgO–SiO<sub>2</sub> phase diagram comprises six binary and four ternary phase diagrams of oxide systems. Earlier, I examined the phase diagrams of the binary FeO–MnO, FeO–MgO, FeO–SiO<sub>2</sub>, and MnO–MgO and ternary FeO–MnO–MgO oxide systems. In the present study, the FeO–MnO–SiO<sub>2</sub>, FeO–MgO–SiO<sub>2</sub>, and MgO–MnO–SiO<sub>2</sub> phase diagrams are constructed. In the calculations, the theory of subregular ionic solutions is used, which takes into account the dependence of the coordination number on the melt composition. This theory adequately describes the liquidus of the oxide systems characterized by the presence of two immiscible liquids, which agrees with experimental data available in the literature. In the present study, the energy parameters in the theory are selected for the calculation of the activities of constituents of oxide melt of each of the systems under study and the parameter in the theory of regular ionic solutions is selected in order to calculate the activities of constituents of the magnesium–manganese orthosilicate |Mg<sub>2</sub>SiO<sub>4</sub>, Mn<sub>2</sub>SiO<sub>4</sub>| solution. The obtained data on the phase diagrams of the systems comprising the FeO–MnO–MgO–SiO<sub>2</sub> system allow one to determine nonmetallic inclusions in equilibrium with the liquid metal in the Fe—Mg—Mn—Si–O system.</p>

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Phase Diagrams of the FeO–MnO–MgO–SiO2 Oxide System: Ternary FeO–MnO–SiO2, FeO–MgO–SiO2, and MgO–MnO–SiO2 Phase Diagrams

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • L. A. Makrovets

摘要

Abstract

The knowledge of the thermodynamics and phase equilibria of the FeO–MnO–MgO–SiO2 silicate melts and MnO–MgO–SiO2 silicate solid solutions allows one to predict the appearance of nonmetallic inclusions in steel in the presence of silicon, manganese, and magnesium. The FeO–MnO–MgO–SiO2 phase diagram comprises six binary and four ternary phase diagrams of oxide systems. Earlier, I examined the phase diagrams of the binary FeO–MnO, FeO–MgO, FeO–SiO2, and MnO–MgO and ternary FeO–MnO–MgO oxide systems. In the present study, the FeO–MnO–SiO2, FeO–MgO–SiO2, and MgO–MnO–SiO2 phase diagrams are constructed. In the calculations, the theory of subregular ionic solutions is used, which takes into account the dependence of the coordination number on the melt composition. This theory adequately describes the liquidus of the oxide systems characterized by the presence of two immiscible liquids, which agrees with experimental data available in the literature. In the present study, the energy parameters in the theory are selected for the calculation of the activities of constituents of oxide melt of each of the systems under study and the parameter in the theory of regular ionic solutions is selected in order to calculate the activities of constituents of the magnesium–manganese orthosilicate |Mg2SiO4, Mn2SiO4| solution. The obtained data on the phase diagrams of the systems comprising the FeO–MnO–MgO–SiO2 system allow one to determine nonmetallic inclusions in equilibrium with the liquid metal in the Fe—Mg—Mn—Si–O system.