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Microstructure and mechanical properties of carbon fibre-reinforced alumina composites fabricated from sol

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Abstract

Alumina matrix composites reinforced with the laminated and stitched carbon fibre cloth preform were fabricated through the infiltration–drying–heating route using the \(\hbox {Al}_{2}\hbox {O}_{3}\) sol with a high solid content as raw materials. The investigation was focussed on the characteristics of sol and the mechanical properties and high-temperature resistance of \(\hbox {C}/\hbox {Al}_{2}\hbox {O}_{3}\) composites. \({\upalpha }\hbox {-Al}_{2}\hbox {O}_{3}\) with favourable sintering activity can be obtained after heat treatment of sol at \(1200{^{\circ }}\hbox {C}\). The as-received \(\hbox {C}/\hbox {Al}_{2}\hbox {O}_{3}\) composites with a total porosity of 16.8% exhibit a flexural strength of 271.3 MPa and a notch toughness of 13.0 MPa \(\hbox {m}^{1/2}\), respectively. As a result of the evolution of interface and matrix, the flexural strength of \(\hbox {C}/\hbox {Al}_{2}\hbox {O}_{3}\) composites is decreased by 28.5% after heat treatment at \(1600{^{\circ }}\hbox {C}\) for 1 h under inert atmosphere. At the same time, fracture mode of composites is transformed from tough to brittle behaviour.

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Acknowledgements

This work was financially supported by the Science Innovation Foundation of Shanghai Academy of Spaceflight Technology (Grant No. SAST2015043).

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Authors and Affiliations

  1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha, 410073, People’s Republic of China

    Chaoyang Fan, Qingsong Ma & Kuanhong Zeng

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  1. Chaoyang Fan
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  2. Qingsong Ma
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  3. Kuanhong Zeng
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Correspondence to Qingsong Ma.

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Fan, C., Ma, Q. & Zeng, K. Microstructure and mechanical properties of carbon fibre-reinforced alumina composites fabricated from sol. Bull Mater Sci 41, 68 (2018). https://doi.org/10.1007/s12034-018-1597-z

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  • DOI: https://doi.org/10.1007/s12034-018-1597-z

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