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Effects of Grain Size and Humidity on Fretting Wear in Fine‐Grained Alumina, Al 2 O 3 /TiC, and Zirconia
Author(s) -
Krell Andreas,
Klaffke Dieter
Publication year - 1996
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.1151-2916.1996.tb08565.x
Subject(s) - materials science , grain size , microstructure , grain boundary , composite material , ceramic , toughness , cubic zirconia , metallurgy
Friction and wear of sintered alumina with grain sizes between 0.4 and 3 μm were measured in comparison with Al 2 O 3 /TiC composites and with tetragonal ZrO 2 (3 mol% Y 2 O 3 ). The dependence on the grain boundary toughness and residual microstresses is investigated, and a hierarchical order of influencing parameters is observed. In air, reduced alumina grain sizes improve the micromechanical stability of the grain boundaries and the hardness, and reduced wear is governed by microplastic deformation, with few pullout events. Humidity and water slightly reduce the friction of all of the investigated ceramics. In water, this effect reduces the wear of coarser alumina microstructures. The wear of aluminas and of the Al 2 O 3 /TiC composite is similar; it is lower than observed in zirconia, where extended surface cracking occurs at grain sizes as small as 0.3 μm.