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Oxidizing ageing effects on SiC-SiC composites

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Abstract

The effects of oxidizing ageing at 800 and 1400 ‡C were investigated on two unprotected SiC-SiC composites differing in the thickness of the carbon interlayer between the fibres and the matrix. Three-point bending tests showed that ageing generally induces an embrittlement and a weakening of the material. Fractographic observations and microstructural analyses allowed this damage to be correlated with a strengthening of the bonding at the interfaces related to their oxidation. At 1400‡C, this phenomenon is however limited by passive oxidation and by a change in the crystallographic structure of the silica created at the interfaces.

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Authors and Affiliations

  1. Ecole des Mines de Paris, Centre des Matériaux, BP 87, 91003, Evry Cédex, France

    N. Frety, R. Molins & M. Boussuge

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  1. N. Frety
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  2. R. Molins
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  3. M. Boussuge
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Frety, N., Molins, R. & Boussuge, M. Oxidizing ageing effects on SiC-SiC composites. J Mater Sci 27, 5084–5090 (1992). https://doi.org/10.1007/BF01105277

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  • DOI: https://doi.org/10.1007/BF01105277

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