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Open Access Microstructure and mechanical properties of ZrO2–40 wt%Al2O3 composite ceramics

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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 ยท 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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Keywords: ALUMINA; FLEXURAL STRENGTH; FRACTURE TOUGHNESS; VICKERS HARDNESS; ZIRCONIA

Document Type: Research Article

Publication date: August 1, 2014

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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