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Abstract <p>Manganese and silicon are present in almost any steel, whereas magnesium can enter into a metal from a brickwork and magnesia slags or is introduced in the form of a master alloy; because of this, the knowledge of the thermodynamics and phase equilibria of liquid and solid silicate solutions allows the appearance of intermetallic inclusions in a steel to be predicted. The FeO–MnO–MgO–SiO<sub>2</sub> phase diagram comprises six binary and four ternary phase diagrams of oxide systems. Previously, the binary FeO–MnO, FeO–MgO, FeO–SiO<sub>2</sub>, and MnO–MgO oxide systems were studied in my works. In the present study, the phase diagrams of the MnO–SiO<sub>2</sub> and MgO–SiO<sub>2</sub> oxide systems are considered and liquidus and thermodynamic data on the melting of manganese and magnesium silicates, namely, the enthalpies and entropies of melting of manganese and magnesium ortho- (MnSiO<sub>4</sub> and MgSiO<sub>4</sub>, respectively) and metasilicates (Mn<sub>2</sub>SiO<sub>3</sub> and MgSiO<sub>3</sub>, respectively) are calculated. To calculate the activities of oxide melt constituents, the theory of subregular ionic solutions is used, which takes into account the dependence of coordination number on the melt composition; the theory adequately describes the phase diagrams characterized by two immiscible liquids and agrees with the literature experimental data. The obtained data on the energy parameters in the subregular ionic solutions for the MnO–SiO<sub>2</sub> and MgO–SiO<sub>2</sub> systems and the thermodynamic data on the formation of manganese and magnesium silicates allow one to study the ternary oxide systems making up the FeO–MgO–MnO–SiO<sub>2</sub> system.</p>

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Phase Diagrams of the FeO–MnO–MgO–SiO2 Oxide System: Binary MnO–SiO2 and MgO–SiO2 Oxide Systems

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • L. A. Makrovets

摘要

Abstract

Manganese and silicon are present in almost any steel, whereas magnesium can enter into a metal from a brickwork and magnesia slags or is introduced in the form of a master alloy; because of this, the knowledge of the thermodynamics and phase equilibria of liquid and solid silicate solutions allows the appearance of intermetallic inclusions in a steel to be predicted. The FeO–MnO–MgO–SiO2 phase diagram comprises six binary and four ternary phase diagrams of oxide systems. Previously, the binary FeO–MnO, FeO–MgO, FeO–SiO2, and MnO–MgO oxide systems were studied in my works. In the present study, the phase diagrams of the MnO–SiO2 and MgO–SiO2 oxide systems are considered and liquidus and thermodynamic data on the melting of manganese and magnesium silicates, namely, the enthalpies and entropies of melting of manganese and magnesium ortho- (MnSiO4 and MgSiO4, respectively) and metasilicates (Mn2SiO3 and MgSiO3, respectively) are calculated. To calculate the activities of oxide melt constituents, the theory of subregular ionic solutions is used, which takes into account the dependence of coordination number on the melt composition; the theory adequately describes the phase diagrams characterized by two immiscible liquids and agrees with the literature experimental data. The obtained data on the energy parameters in the subregular ionic solutions for the MnO–SiO2 and MgO–SiO2 systems and the thermodynamic data on the formation of manganese and magnesium silicates allow one to study the ternary oxide systems making up the FeO–MgO–MnO–SiO2 system.