Publication detail
Crack healing behaviour of Al2O3/SiC nanocomposite ceramicS
FLAŠAR, P. DLOUHÝ, I. CHLUP, Z.
Czech title
ZACELOVÁNÍ POVRCHOVÝCH TRHLIN U NANOKOMPOZITNÍ KERAMIKY TYPU Al2O3/SiC
English title
Crack healing behaviour of Al2O3/SiC nanocomposite ceramicS
Type
conference paper
Language
en
Original abstract
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 um and depth no higher than 100 um.
Czech abstract
Na nanokompozitní keramice typu Al2O3/SiC byla za použití ohybových vzorků s poloeliptickou povrchovou trhlinou připravenou za pomocí indentační techniky měřena pevnost v ohybu a sledována schopnost zacelování povrchových trhlin. Vzorky v podobě trámečků pro zkoušky tříbodovým a čtyřbodovým ohybem byly připraveny keramografickými metodami. Pevnost v ohybu a lomová houževnatost byly měřeny za použití tří a čtyřbodového ohybu. Pro zacelování vzorků s povrchovou trhlinou bylo použito žíhání při 1573 K po dobu 1 h. Pro faktografickou analýzu povrchů vzorků a lomů byly použity techniky světelné a elektronové mikroskopie. Pro sledovaný materiál byla zjištěna velmi dobrá schopnost zacelení povrchových trhlin velikosti do 250 um zasahujících do hloubky nejvýše 100 um.
English abstract
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 um and depth no higher than 100 um.
Keywords in English
Al2O3/SiC, alumina based nanocomposite, self-crack-healing, flexural strength, fracture toughness, Vickers indentation
RIV year
2006
Released
18.08.2006
Publisher
VŠB Ostrava
Location
Ostrava
Book
New methods of demage and failure analysis of structural parts
Pages from–to
215–222
Pages count
7
BIBTEX
@inproceedings{BUT21818,
author="Petr {Flašar} and Ivo {Dlouhý} and Zdeněk {Chlup},
title="Crack healing behaviour of Al2O3/SiC nanocomposite ceramicS",
booktitle="New methods of demage and failure analysis of structural parts",
year="2006",
month="August",
pages="215--222",
publisher="VŠB Ostrava",
address="Ostrava"
}