Influence of Porosity on Friction and Wear of Tetragonal Zirconia Polycrystal


He, Yingjie and Winnubst, Louis and Burggraaf, Anthonie J. and Verweij, Henk and Varst, Paul G.Th. van de and With, Bert de (1997) Influence of Porosity on Friction and Wear of Tetragonal Zirconia Polycrystal. Journal of the American Ceramic Society, 80 (2). pp. 377-380. ISSN 0002-7820

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Abstract:Sliding wear properties of ultra-fine-grained (180 nm) yttria-doped tetragonal zirconia (Y-TZP) ceramics were examined with porosities from 1.5% to 7%. On a pin-on-plate tribometer under dry-N2 conditions, e.g., wear rates of the material increase by a factor of 5 by increasing porosity with a factor of 5 (from 1.5 to 7.0 vol%). In all cases no (irreversible) phase transformation to monoclinic zirconia took place during wear tests. The results for the relatively dense nanostructured materials showed significant evidence of plastic deformation and less microcrack formation. The morphology of the wear tracks in these ceramics indicate that the degree and amount of microcracks on the contact surface increased with porosity. A change in wear mechanism is observed.

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Copyright:© 1997 Blackwell
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