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<p>A fused cast refractory with a composition from the system Al<sub>2</sub>O<sub>3</sub>-ZrO<sub>2</sub>-SiO<sub>2</sub> (AZS) as frequently used for industrial glass tanks was studied. As shown by X-ray diffraction, monoclinic ZrO<sub>2</sub> and α-Al<sub>2</sub>O<sub>3</sub> (corundum) were present. As proved by scanning electron microscopy and transmission electron microscopy, monoclinic ZrO<sub>2</sub> occurs in two morphological different types, as compact large crystals with sizes in the 50–200&#xa0;μm range and as dendritic structures. The monoclinic phase is formed by a phase transition of an initially formed tetragonal ZrO<sub>2</sub> phase during cooling. Besides, compact crystals of α-Al<sub>2</sub>O<sub>3</sub> (corundum) as well as a residual glass phase were detected, however, mullite was not observed. The glass phase contains tiny tetragonal ZrO<sub>2</sub> crystals with sizes of few nm up to 130&#xa0;nm. These crystals contain some HfO<sub>2</sub>, UO<sub>2</sub>, TiO<sub>2</sub> and Y<sub>2</sub>O<sub>3</sub> and do not transfer to the monoclinic phase during cooling due to their small sizes and the incorporation of Y<sub>2</sub>O<sub>3</sub> which both have a stabilizing effect.</p>

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Microstructure in fused cast AZS refractories—an SEM and TEM study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月28日

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  • Christian Thieme,
  • Susanne Selle,
  • Christian Rüssel

摘要

A fused cast refractory with a composition from the system Al2O3-ZrO2-SiO2 (AZS) as frequently used for industrial glass tanks was studied. As shown by X-ray diffraction, monoclinic ZrO2 and α-Al2O3 (corundum) were present. As proved by scanning electron microscopy and transmission electron microscopy, monoclinic ZrO2 occurs in two morphological different types, as compact large crystals with sizes in the 50–200 μm range and as dendritic structures. The monoclinic phase is formed by a phase transition of an initially formed tetragonal ZrO2 phase during cooling. Besides, compact crystals of α-Al2O3 (corundum) as well as a residual glass phase were detected, however, mullite was not observed. The glass phase contains tiny tetragonal ZrO2 crystals with sizes of few nm up to 130 nm. These crystals contain some HfO2, UO2, TiO2 and Y2O3 and do not transfer to the monoclinic phase during cooling due to their small sizes and the incorporation of Y2O3 which both have a stabilizing effect.