Viscoelastic effects in testing of an Al2O3 ceramic containing a glassy phase

Viscoelastic effects in testing of an Al2O3 ceramic containing a glassy phase

An alumina with 3 wt% glassy phase was tested at different loading rates at two temperatures (900 and 1000 C). It was found that an increase in fracture toughness was accompanied by a decrease of the bending strength at the same loading rates. A model is given, which describes the experimental resul...

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Veröffentlicht in:Journal of materials science 1993-01, Vol.28 (16), p.4341-4346
Hauptverfasser: PETERLIK, H, KROMP, K
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Sprache:eng
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Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
General studies
Technical ceramics
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container_title Journal of materials science
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creator PETERLIK, H
KROMP, K
description An alumina with 3 wt% glassy phase was tested at different loading rates at two temperatures (900 and 1000 C). It was found that an increase in fracture toughness was accompanied by a decrease of the bending strength at the same loading rates. A model is given, which describes the experimental results by linear viscoelasticity of the second phase. Whereas the bulk properties are mainly due to the alumina grains and, therefore, remain nearly unchanged, the crack growth and the fracture behaviour in the intergranular regions is dominated by the viscosity of the glassy phase. This leads to a non-unique value of KIC, which is dependent on the temperature and the loading rate. 9 refs.
doi_str_mv 10.1007/BF01154940
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subjects Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
General studies
Technical ceramics
title Viscoelastic effects in testing of an Al2O3 ceramic containing a glassy phase
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