SiC-TiC複合材の高靭化機構

概要

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Three different microstructures in SiC-TiC composites containing Al_2O_3 and Y_2O_3 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.
社団法人日本セラミックス協会の論文
2004-01-01