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

  • Chaoyang Fan
  • Qingsong Ma
  • Kuanhong Zeng
Article
  • 54 Downloads

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.

Keywords

Alumina composites carbon fibre reinforcement sol mechanical properties 

Notes

Acknowledgements

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

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Science and Technology on Advanced Ceramic Fibers and Composites LaboratoryNational University of Defense TechnologyChangshaPeople’s Republic of China

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