Abstract
ZTA is an innovative ceramic composite for advanced industrial applications because of its superior mechanical properties compared to both pure Al2O3 and ZrO2. Therefore, it was subjected to extensive study since 1970s. The last review by Wang and Stevens (1989) focused on the development of ZTA ceramics through controlling powder preparation and densification processes. The current review verified the effects of adding various additives into ZTA ceramics utilising several sintering techniques and preparation routes to further enhance their mechanical properties through governing their microstructure pattern. It shows that the porosity, number and total quantity of additives, the reaction of additives with ZTA ingredients, grains sizes, and the number of secondary phases are important parameters affecting the mechanical properties of ZTA. This review also reported the most recent progress in the enhancement of mechanical properties of ZTA as an alternative to other costly related advanced materials industries and suggested a few approaches to accomplish this objective.
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