Microstructure and mechanical properties of ZrO2–40 wt%Al2O3 composite ceramics
The effects of the sintering temperature on the microstructure, crystalline phases and mechanical properties of the 3 mol% yttria-stabilized ZrO2–40 wt.%Al2O3 (abridged as 3YSZ–40 wt.%Al2O3) composites has been investigated. The monoclinic zirconia (m-ZrO2) phase has completely been transformed into tetragonal zirconia (t-ZrO2) phase for Al2O3 content. The presence of 3 mol% yttria-stabilized zirconia (3YSZ) particles on the grain boundaries effectively limits a rapid grain growth of the Al2O3 grains. The relative density and average grain size increased with increasing the sintering temperature. The maximum flexural strength of 395 MPa, Vickers hardness of 15.01 GPa and fracture toughness of 6.1 MPa · m1/2 was associated with the highly 99.4% dense homogeneous microstructure consisting of t-ZrO2 grains of the critical size, which makes it suitable for dental applications.
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Document Type: Research Article
Publication date: August 1, 2014
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