Abstract
In this paper, we comprehensively review the physical principles behind the improvement of mechanical properties of zirconia (ZrO2) related ceramics. First, the transformation behaviour of different phases in zirconia is discussed. We next present an overview of two zirconia-related commercially important systems e.g. ZrO2-MgO and ZrO2-Y2O3. The commercial engineering ceramic materials, generated from these systems, are known as partially stabilized zirconia and tetragonal zirconia polycrystal respectively. The third important material is called zirconia toughened alumina. The evolution, characterization and importance of the microstructure in relation to the basic systems are also presented. Attention is then focussed on to three toughening mechanisms e.g. phase transformation toughening, microcrack toughening and crack deflection toughening. We carefully assess the roles they play in improving toughness. We discussR-curve behaviour arising out of these toughening mechanisms and the implications ofR-curve behaviour in engineering applications. Finally, the subcritical crack growth and tribological behaviour of these materials are discussed.
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Bhaduri, S.B. Science of zirconia-related engineering ceramics. Sadhana 13, 97–117 (1988). https://doi.org/10.1007/BF02811960
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DOI: https://doi.org/10.1007/BF02811960