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Influence of Porosity on Friction and Wear of Tetragonal Zirconia Polycrystal
Author(s) -
He Yingjie,
Winnubst Louis,
Burggraaf Anthonie J.,
Verweij Henk,
Varst Paul G. Th.,
With Bert
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb02841.x
Subject(s) - materials science , porosity , cubic zirconia , tribometer , tetragonal crystal system , composite material , ceramic , monoclinic crystal system , phase (matter) , metallurgy , tribology , mineralogy , crystallography , crystal structure , geology , chemistry , organic chemistry
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‐N 2 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.