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Zacelování povrchových trhlin u nanokompozitní keramiky typu Al2O3/SiC
 Flašar, Petr ; Dlouhý, Ivo ; Chlup, Zdeněk ; Ando, K.
Indentation strength and self-crack-healing ability were systematically studied using beams containing a semi-elliptical surface crack made by Vickers indentor. Beams of Al2O3/SiC ceramic nanocomposite with a good self-crack-healing ability predetermined for four-point and three-point bending test were prepared by ceramographics techniques. Flexural strength and fracture toughness were determined using three- and four-point bend method. Thermal aging at 1573 K for 1h was applied to heal the samples with indentation pre-cracking. Fractographical analyses using an optical and/or scanning electron microscopy has been carried out to investigate the surface crack behaviour. Very good self-crack healing ability has been proved for surface microcracks having length up to 250 μm and depth no higher than 100 μm.
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