Abstract
The effect of transformation toughening on the wear behaviour of tetragonal zirconia polycrystals (TZPs) has been evaluated. Trials were conducted using wire drawing dies and automotive cam followers fabricated from both 2 and 3 mol% Y2O3 TZPs, sliding under lubricated conditions against steel counterfaces. The worn surfaces were analysed by scanning electron microscopy and X-ray diffraction techniques. A mechanism for the wear of TZP ceramics is presented which provides a qualitative relationship with the degree of transformability, the composition of the asreceived powder and the preferred orientation effects occurring in the surface layers of ceramic wear components.
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