Abstract
Tetragonal zirconia polycrystal (TZP) is a new type of zirconia-based engineering ceramic. TZP ceramics are attractive because of their excellent room-temperature mechanical properties, which include flexural strength values over 1 GPa and a fracture toughness greater than 15 MPam 1 2 . These, combined with superior wear properties and a thermal expansion coefficient close to that of iron and iron-based alloys, give rise to a class of desirable engineering ceramics. This review will attempt to summarise the considerable amount of work done on the microstructural development and mechanical properties of TZP, especially over the last few years. The paper is divided into four main sections: 1. (a) The ZrO 2Y 2O 3 phase diagram. 2. (b) Development and optimisation of Y-TZP. 3. (c) Low-temperature ageing of TZP. 4. (d) TZP developed by means of the ZrO 2CeO 2 system
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