Publication detail
Fracture behaviour of Al2O3/SiC nanocomposite ceramics after crack healing treatment
CHLUP, Z. FLAŠAR, P. KOTOJI, A. DLOUHÝ, I.
Czech title
Lomové chování nanokompozitu Al2O3/SiC po žíhání na zacelení trhliny
English title
Fracture behaviour of Al2O3/SiC nanocomposite ceramics after crack healing treatment
Type
journal article - other
Language
en
Original abstract
The self-crack-healing ability was systematically studied using flexural strength measurement of beams containing a semi-elliptical surface crack made by Vickers indenter. Beams of Al2O3/SiC ceramic nanocomposite with a good self-crack-healing ability predetermined for four-point and three-point bend test were prepared by ceramographic techniques. Flexural strength and fracture toughness were determined using three- and four-point bend method. Thermal aging in range from 1000 .C up to 1300 .C for 1 h was applied to find optimal conditions to heal the samples pre-cracked by the indentation technique. 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 micro-cracks having length up to 250 um and depth no higher than 100 um.
Czech abstract
Byla studována schopnost k zacelování trhliny za použití měření ohybové pevnosti trámečků obsahujících semieliptickou povrchovou trhlinu připravenou Vickersovým intentorem. Ke zkouškám byly připraveny trámečky určené pro tříbodový a čtyřbodový ohyb z Al2O3/SiC keramického nanokompozitu s dobrou schopností k zacelování trhlin a byla určena pevnost v ohybu a lomová houževnatost. V rámci hledání optimálních podmínek zacelování trhlin připravených indentace bylo aplikováno žíhání v rozmezí teplot od 1000 C do 1300 C po dobu 1 h. Ke studiu chování povrchové trhliny byla použita optická a rastrovací elektronová mikroskopie. Byla zjištěna velmi dobrá schopnost k zacelování trhlin velikosti až 250 mikrometrů do hloubky přibližně 100 mikrometrů.
English abstract
The self-crack-healing ability was systematically studied using flexural strength measurement of beams containing a semi-elliptical surface crack made by Vickers indenter. Beams of Al2O3/SiC ceramic nanocomposite with a good self-crack-healing ability predetermined for four-point and three-point bend test were prepared by ceramographic techniques. Flexural strength and fracture toughness were determined using three- and four-point bend method. Thermal aging in range from 1000 .C up to 1300 .C for 1 h was applied to find optimal conditions to heal the samples pre-cracked by the indentation technique. 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 micro-cracks having length up to 250 um and depth no higher than 100 um.
Keywords in Czech
kompozity, pevnost, Al2O3/SiC, zacelování trhlin
Keywords in English
Composites; Strength; Al2O3/SiC; Crack healing
RIV year
2008
Released
01.08.2008
Publisher
Elsevier
Location
GB
ISSN
0955-2219
Journal
Journal of the European Ceramic Society
Volume
28
Number
5
Pages from–to
1073–1077
Pages count
5
BIBTEX
@article{BUT48135,
author="Zdeněk {Chlup} and Petr {Flašar} and Ando {Kotoji} and Ivo {Dlouhý},
title="Fracture behaviour of Al2O3/SiC nanocomposite ceramics after crack healing treatment",
journal="Journal of the European Ceramic Society",
year="2008",
volume="28",
number="5",
month="August",
pages="1073--1077",
publisher="Elsevier",
address="GB",
issn="0955-2219"
}