Abstract
The crystallization, morphological and mechanical behavior of excess ceria additions in zirconia toughened alumina (ZTA) systems is investigated. The results reveal the crucial role of ceria in the thermal stability of ZTA systems. The pure ZTA system indicated degraded to yield monoclinic zirconia (m-ZrO2) at 1200 °C whereas ceria inclusions retained the phase stability of ZTA systems till 1500 °C. The ceria additions higher than zirconia influenced the dominant crystallization of cubic ceria (c-CeO2) whereas equal presence of ceria and zirconia led to the crystallization of t-ZrO2 as an additional phase. Moreover, the complete solubility of Zr4+ at the c-CeO2 lattice was also observed in the compositions that possessed high ceria content. The SEM analysis revealed varied morphologies with limited CeO2 additions exhibiting a uniform and dense morphology, whereas excess CeO2 additions displayed its disintegrated growth on the Al2O3 matrix. Excess ceria additions to the ZTA systems were proved detrimental as it displayed poor mechanical properties.
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