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TOUGHENING MECHANISMS OF Al2O3–SiO2–ZrO2 COMPOSITE MATERIALS

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Author(s): G. MEBRAHITOM ASMELASH | O. MAMAT | FAIZ AHMAD

Journal: Ceramics-Silikáty
ISSN 0862-5468

Volume: 56;
Issue: 4;
Start page: 360;
Date: 2012;
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Keywords: Flexural strength | Fracture toughness | Pressureless sintering | Residual stress

ABSTRACT
In this paper, Al2O3–SiO2–ZrO2 (ASZ) composite was developed via pressureless sintering route and investigated for microstructures and mechanical properties. The flexural strength and fracture toughness of the SiO2 + ZrO2 particles reinforced alumina matrix was developed and measured 230.39 MPa and 2.39 MPa.m1/2, respectively, demonstrating a significant tougheners due to the presence of both particles. The microstructural observation on cracked and fractured samples showed that three toughening mechanisms, crack deflection, crack bridging and microcracks were the contributing factors for the enhanced toughness of the matrix and the composite. Besides, phase transformation toughening and residual stress due to difference of coefficient of thermal expansion played a key role for the improved toughness of the composites.
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