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Improved hardness and hierarchic influences on wear in submicron sintered alumina

: Krell, A.


Materials Science and Engineering, A. Structural materials, properties, microstructure and processing 209 (1996), No.1/2, pp.156-163
ISSN: 0921-5093
Journal Article
Fraunhofer IKTS ()
Al2O3; alumina ceramics; friction; hardness; Härte; Reibung; Sinterkorund; Verschleiß; Verschleißfestigkeit; Verschleißmechanismen; wear mechanism; wear resistance

Pressureless sintering is used to produce submicron alumina bodies with a hardness that equals the level of advanced hot-isostatically pressed Al2O3/TiC composites with 35 vol-% carbide. Wear can be reduced by almost one order of magnitude by reducing the grain size from 4 to 0.4 mym, but the grain size effect on wear strongly depends on the environment. Wear is governed by the pull-out behavior of grains with a secondary influence of the hardness. Therefore, the hierarchic order of the parameters which affect wear is dominated by the micromechanical stability of the grain boundaries.