Abstract
Abstract Composites of yttria- and ceria-stabilized tetragonal zirconia polycrystals (Y-TZP, Ce-TZP) with up to 20 vol% alumina platelets were fabricated by hot isostatic pressing. The microstructure and mechanical properties of these materials were investigated. The fracture toughness of Y-TZP increased by addition of platelets, e.g. KIc of 2Y-TZP from 8·2 M Pa m to 9·5 M Pa m with 5 vol% Al2O3-platelets. The fracture strength of this composite, however, decreased from 1430 MPa to 735 MPa. Such decrease in strength was generally observed in Y-TZP platelet composites investigated in this work. Platelet-reinforced Ce-TZP exhibited a slight increase in strength and a decrease in fracture toughness in comparison to the non-reinforced matrix.
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