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<p>The solid-liquid phase equilibria in the Na<sub>2</sub>O-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> system, relevant in several industrial applications, were experimentally investigated. The liquidus compositions in the ternary system, at temperatures ranging from 1200 to 1600&#xa0;°C, at the saturation of solid SiO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub>, and 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub>, were measured by the equilibration-quenching method using Energy-Dispersive x-ray Spectroscopy (EDS) and Electron Probe Microanalyzer (EPMA) technique. This study introduces a new approach to achieving equilibrium more quickly, which is often challenging due to the slow formation of 3Al<sub>2</sub>O<sub>3</sub>·2SiO<sub>2</sub> (mullite). Furthermore, the use of EDS and EPMA enhances the accuracy of the results, marking a significant improvement over previous studies that relied on petrographic analysis. The experimental data obtained were compared with findings from earlier studies and with computed phase diagrams derived from two well-established thermodynamic databases. The insights gained from this investigation contribute to the existing body of knowledge and the thermodynamic models related to the Na<sub>2</sub>O-Al<sub>2</sub>O<sub>3</sub>-SiO<sub>2</sub> system.</p>

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Phase Equilibria of Na2O-Al2O3-SiO2 System at 1200 to 1600 °C in Air

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Lina Nur Listiyowati,
  • David Sibarani,
  • Imam Santoso,
  • Pekka Taskinen,
  • Daniel Lindberg,
  • Edy Sanwani,
  • Mohammad Zaki Mubarok

摘要

The solid-liquid phase equilibria in the Na2O-Al2O3-SiO2 system, relevant in several industrial applications, were experimentally investigated. The liquidus compositions in the ternary system, at temperatures ranging from 1200 to 1600 °C, at the saturation of solid SiO2, Al2O3, and 3Al2O3·2SiO2, were measured by the equilibration-quenching method using Energy-Dispersive x-ray Spectroscopy (EDS) and Electron Probe Microanalyzer (EPMA) technique. This study introduces a new approach to achieving equilibrium more quickly, which is often challenging due to the slow formation of 3Al2O3·2SiO2 (mullite). Furthermore, the use of EDS and EPMA enhances the accuracy of the results, marking a significant improvement over previous studies that relied on petrographic analysis. The experimental data obtained were compared with findings from earlier studies and with computed phase diagrams derived from two well-established thermodynamic databases. The insights gained from this investigation contribute to the existing body of knowledge and the thermodynamic models related to the Na2O-Al2O3-SiO2 system.