Critical zirconia amount to enhance the strength of alumina

A small amount of zirconia particles (≤5 vol.%) is added into alumina in the present study. The grain size of alumina is reduced; the strength of alumina is therefore enhanced. Though the theoretical analysis demonstrates that an addition of 1 vol.% of fine zirconia particles is sufficient to prohib...

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Bibliographic Details
Published in:Ceramics international 2008-12, Vol.34 (8), p.2129-2135
Main Authors: Tuan, Wei-Hsing, Chen, Jiang-Rung, Ho, Chang-Ju
Format: Article
Language:English
Subjects:
A. Sintering
Applied sciences
B. Microstructure-final
Building materials. Ceramics. Glasses
C. Strength
Ceramic industries
Cermets, ceramic and refractory composites
Chemical industry and chemicals
Cross-disciplinary physics: materials science
rheology
D. Al 2O 3
D. ZrO 2
Exact sciences and technology
Materials science
Miscellaneous
Other materials
Physics
Specific materials
Technical ceramics
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Summary:A small amount of zirconia particles (≤5 vol.%) is added into alumina in the present study. The grain size of alumina is reduced; the strength of alumina is therefore enhanced. Though the theoretical analysis demonstrates that an addition of 1 vol.% of fine zirconia particles is sufficient to prohibit the coarsening of alumina grains; the experimental measurements indicate that a minimum amount of 2 vol.% is required to reduce the coarsening of alumina matrix and its size distribution. This discrepancy is due to the separation between the zirconia particles and alumina grain boundaries, which takes place when the alumina grain size increases above a critical value.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2007.08.013