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<p>The effects of adding mixtures of ceria and yttrium aluminum garnet (YAG) additives on the physical, microstructural and mechanical properties of 15&#xa0;wt.% zirconia-toughened alumina were studied. Firstly, the optimum percentage of ceria/YAG additives was evaluated; all mixtures were sintered at 1600, 1650, 1675 and 1700&#xa0;°C. A mixture of 30&#xa0;wt.% ceria with YAG achieved high densification and mechanical properties at 1675&#xa0;°C. Second, 10, 20 and 30&#xa0;wt.% of ceria/YAG additives were added to zirconia-toughened alumina. The samples were sintered at four sintering temperatures (1500-1600&#xa0;°C). The low porosity was achieved at 1575&#xa0;°C, and the 20&#xa0;wt.% additives led to the highest flexural strength and fracture toughness. Tetragonal zirconia is crucial for transformation toughening. YAG acts as an inclusion in the microstructure, allowing for crack deflection toughening, and ceria is essential for maintaining the tetragonal phase of partially stabilized zirconia after sintering.</p>

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Effect of Ceria/YAG Additives on the Mechanical Properties of ZTA Composites

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • S. M. Naga,
  • M. Awaad,
  • E. M. Abdelbary,
  • H. Mahmoud

摘要

The effects of adding mixtures of ceria and yttrium aluminum garnet (YAG) additives on the physical, microstructural and mechanical properties of 15 wt.% zirconia-toughened alumina were studied. Firstly, the optimum percentage of ceria/YAG additives was evaluated; all mixtures were sintered at 1600, 1650, 1675 and 1700 °C. A mixture of 30 wt.% ceria with YAG achieved high densification and mechanical properties at 1675 °C. Second, 10, 20 and 30 wt.% of ceria/YAG additives were added to zirconia-toughened alumina. The samples were sintered at four sintering temperatures (1500-1600 °C). The low porosity was achieved at 1575 °C, and the 20 wt.% additives led to the highest flexural strength and fracture toughness. Tetragonal zirconia is crucial for transformation toughening. YAG acts as an inclusion in the microstructure, allowing for crack deflection toughening, and ceria is essential for maintaining the tetragonal phase of partially stabilized zirconia after sintering.