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Home  >  Journal list  >  Journal of the Ceramic Society of Japan ( 2003 - 2007 )  >  Vol.112  No.1301 (January) (2004)  >  pp.18-21

Journal of the Ceramic Society of Japan ( 2003 - 2007 )
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Toughening Mechanisms in SiC–TiC Composites

Young-Il LEE1) and Young-Wook KIM1)
1) Department of Materials Science and Engineering, The University of Seoul

  Three different microstructures in SiC–TiC composites containing Al2O3 and Y2O3 as sintering additives were prepared by hot-pressing and subsequent annealing. To investigate the dominant toughening mechanism operating in toughened SiC–TiC composites, the microstructure-crack interaction was examined by image analysis. Crack deflection by elongated α-SiC grains was most frequently observed (61% of the observed sites) as the dominant toughening mechanism in the SiC–TiC composites. Crack deflection was generally observed for elongated α-SiC grains with aspect ratio (AR)>2.5 and grain thickness (t)<2.5 μm. Crack bridging (21% of the observed sites) was also observed as one of the operating toughening mechanisms. The rest (18%) of the observed grains fractured transgranularly. The crack bridging mechanism was mostly related to thinner grains with thickness t<2 μm, while transgranularly fractured elongated-grains were mostly related to thicker grains with thickness 2<t<4 μm.

Composite, SiC, TiC, Toughening mechanism, Microstructure

Received: August 13, 2003
Accepted: October 24, 2003 , Published online: January 23, 2004
Copyright (c) 2004 The Ceramic Society of Japan



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