Influence of alumina particle size on fracture toughness of (Y, Nb)-TZP/Al2O3 composites

ZrO2/Al2O3 composites were prepared by mixing a tetragonal ZrO2, stabilised with 5.31 mol% Y2O3 and 4.45 mol% Nb2O5, and Al2O3 having different particle size (0.2 micron and 2.8 micron) to investigate the influence of the Al2O3 particle size on flaw tolerance of the composites. The composites exhibi...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2002-12, Vol.22 (13), p.2173-2179
Main Authors: DEUK YONG LEE, KIM, Dae-Joon, KIM, Bae-Yeon
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Structural ceramics
Technical ceramics
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Summary:ZrO2/Al2O3 composites were prepared by mixing a tetragonal ZrO2, stabilised with 5.31 mol% Y2O3 and 4.45 mol% Nb2O5, and Al2O3 having different particle size (0.2 micron and 2.8 micron) to investigate the influence of the Al2O3 particle size on flaw tolerance of the composites. The composites exhibited rising R-curve behaviour and plateau fracture toughness of 7.9 and 8.8 MPa.m1/2 for the additions of 20 vol% of 0.2 and 2.8 micron Al2O3 particles, respectively. The difference in the fracture resistance was attributed mainly to the grain size of tetragonal phase in the composites, which increased with the Al2O3 particle diameter, and partially to the dispersion toughening. 43 refs.
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(02)00012-2