Abrasive wear of alumina matrix composites
Zbigniew Pędzich Akademia Górniczo-Hutnicza, Wydział Inżynierii Materiałowej i Ceramiki, Katedra Ceramiki Specjalnej, al. A. Mickiewicza 30, 30-059 Kraków, Poland
Quarterly No. 3, 2007 pages 149-154
DOI:
keywords: composites, alumina, wear
abstract The paper describes potential differences in wear mechanisms during wet (Miller Test) and dry (Dry Sand Test) wear tests come from different inclusion type. As an additives zirconia, tungsten carbide, metallic tungsten and their mixtures were used. It was stated that the type of inclusion influences the composite microstructure. Especially it influences the inclusions morphology. This successively, influences the way of material degradation during wear tests. The wear tests results connected with worn surfaces analysis confirmed that the optimal solution for alumina matrix is application of zirconia inclusions. They cause the wear resistance increase at both dry and wet environments. The diversified curvature of zirconia inclusions makes difficult to act the most intensive wear mechanisms (i.e. whole grain pull out). The least effective act metallic inclusions. It is a result of no optimal composite microstructure and probably the weakness of interphase boundary.