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<p>The phase diagram of the SnO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> and SnO<sub>2</sub>–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> systems was investigated experimentally between 1300&#xa0;°C and 1700&#xa0;°C using differential thermal analysis (DTA) and classical equilibration/quenching method, followed by phase characterization <i>via</i> X-ray diffraction (XRD) phase analysis and electron probe micro-analysis (EPMA). Sealed Pt crucible was utilized to prevent the volatile loss of SnO<sub>2</sub> during high-temperature experiments. No melting occurs for the SnO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> system up to 1650&#xa0;°C. For the SnO<sub>2</sub>–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> system, SiO<sub>2</sub>-rich liquid phase forms above 1550&#xa0;°C. Iso-thermal phase diagrams of the SnO<sub>2</sub>–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> system were determined at 1300, 1600, 1620, 1650, and 1700&#xa0;°C. Based on the present experimental data, the thermodynamic modeling of the SnO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> and SnO<sub>2</sub>–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> system was performed using the CALculation of PHAse Diagram (CALPHAD) methodology. The phase diagram of the entire SnO<sub>2</sub>–SiO<sub>2</sub>–Al<sub>2</sub>O<sub>3</sub> system was constructed for the first time.</p>

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Phase Diagram Study and Thermodynamic Modeling of the SnO2–Al2O3 and SnO2–SiO2–Al2O3 System

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Jaesung Lee,
  • In-Ho Jung

摘要

The phase diagram of the SnO2–Al2O3 and SnO2–SiO2–Al2O3 systems was investigated experimentally between 1300 °C and 1700 °C using differential thermal analysis (DTA) and classical equilibration/quenching method, followed by phase characterization via X-ray diffraction (XRD) phase analysis and electron probe micro-analysis (EPMA). Sealed Pt crucible was utilized to prevent the volatile loss of SnO2 during high-temperature experiments. No melting occurs for the SnO2–Al2O3 system up to 1650 °C. For the SnO2–SiO2–Al2O3 system, SiO2-rich liquid phase forms above 1550 °C. Iso-thermal phase diagrams of the SnO2–SiO2–Al2O3 system were determined at 1300, 1600, 1620, 1650, and 1700 °C. Based on the present experimental data, the thermodynamic modeling of the SnO2–Al2O3 and SnO2–SiO2–Al2O3 system was performed using the CALculation of PHAse Diagram (CALPHAD) methodology. The phase diagram of the entire SnO2–SiO2–Al2O3 system was constructed for the first time.