Synergistic roles of carbon fibres and ZrO2 particles in strengthening and toughening Li-α-sialon composites

Carbon fibre reinforced Li-alpha-sialon ceramic matrix composites were fabricated by a process of slurry infiltration followed by hot-pressing. The roles of both carbon fibres and ZrO2 particles in the strengthening and toughening of the composites are discussed. SEM observations show that microcrac...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2002-02, Vol.22 (2), p.225-235
Main Authors: YU, Z. B, THOMPSON, D. P, BHATTI, A. R
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:Carbon fibre reinforced Li-alpha-sialon ceramic matrix composites were fabricated by a process of slurry infiltration followed by hot-pressing. The roles of both carbon fibres and ZrO2 particles in the strengthening and toughening of the composites are discussed. SEM observations show that microcracks in the matrix resulting from the thermal mismatch between the carbon fibres and the matrix can be eliminated by the addition of the ZrO2 and a considerable amount of fibre pullout was achieved during fracture failure of the composites. Measurement of mechanical properties indicates that a synergistic strengthening and toughening was achieved with bending strength and fracture toughness of about 410 MPa and about 12 MPa.m1/2 respectively. 20 refs.
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(01)00262-X