Special attention has been given to ZrO
2-based ceramics, such as partially stabilized ZrO
2 (PSZ), tetragonal ZrO
2 polycrystal (TZP), and ZrO
2-toughened Al
2O
3 (ZTA), to improve the mechanical properties of ceramic materials. Hot isostatic pressing (HIP) is applied to fabricate dense ZrO
2-based ceramics from solid solution powders developed by sol-gel techniques. This paper reviews recent research trends and progresses related to the solid solution and composite ceramics focussing on the microstructures, strength and fracture toughness, and ionic conductivity.
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