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Research Article | Open Access

Mechanical properties and thermal stability of carbon fiber cloth reinforced sol-derived mullite composites

Wei ZHANGa,b, Qingsong MAb( ), Kuanhong ZENGb, Songlin LIANGb, Weiguo MAOa( )
School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, Hunan, China
Science and Technology on Advanced Ceramic Fibers & Composites Laboratory, National University of Defense Technology, Changsha 410073, China
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Abstract

For the wide application as thermal protection materials, it is very necessary for mullite ceramics to improve fracture toughness. In this paper, the laminated and stitched carbon fiber cloth preform reinforced mullite (C/mullite) composites were prepared through the route of sol impregnation and heat treatment using the Al2O3-SiO2 sol with a high solid content as raw materials. The C/mullite composites showed a flexural strength of 228.9 MPa that was comparable to that of dense monolithic mullite although the total porosity reached 13.4%. Especially, a fracture toughness of 11.2 MPa·m1/2 that was 4-5 times that of dense monolithic mullite was obtained. Strength deterioration due to the carbothermal reduction between carbon fiber and the residual SiO2 in matrix was found above 1200 ℃. A pyrolytic C (PyC) coating was deposited on carbon fibers as interfacial coating. The chemical damage to carbon fibers was obviously alleviated by the sacrifice of PyC coating. Accordingly, the C/PyC/mullite composites kept strength unchanged up to 1500 ℃, and showed much higher strength retention ratio than C/mullite composites after annealing at 1600 ℃.

Keywords

carbon fiber reinforced mullite compositesolmechanical propertythermal stability

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Journal of Advanced Ceramics
Volume 8 Issue 2,
June 2019
Pages 218-227
DOI: 10.1007/s40145-018-0307-z
Cite this article:
ZHANG W, MA Q, ZENG K, et al. Mechanical properties and thermal stability of carbon fiber cloth reinforced sol-derived mullite composites. Journal of Advanced Ceramics, 2019, 8(2): 218-227. https://doi.org/10.1007/s40145-018-0307-z

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Received: 30 August 2018
Revised: 05 November 2018
Accepted: 21 November 2018
Published: 13 June 2019
© The author(s) 2019

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