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Sliding Wear of Oxide Ceramics at Elevated Temperatures
Author(s) -
Senda Tetsuya,
Drennan John,
McPherson Reg
Publication year - 1995
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.1151-2916.1995.tb09077.x
Subject(s) - materials science , ceramic , crystallite , mullite , recrystallization (geology) , grain size , metallurgy , oxide , dislocation , brittleness , composite material , microstructure , paleontology , biology
Sliding wear tests of sintered alumina and mullite consistently showed that the wear loss significantly decreased at 800°C and above by an order of magnitude. Microscopy of the room‐temperature wear surfaces revealed a feature suggesting material removal by brittle fracture. Microscopy of the wear surface at 1000°C revealed that the immediate vicinity of the wear surface consisted of a very fine grain size polycrystalline structure. The zone below this consisted of heavily deformed grains containing dense dislocation networks forming a cellular structure. The results suggest that, at high temperatures, dynamic recrystallization at the wear surface forms the fine grain size structure which suppresses further material removal.