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

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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 Al 2O 3–SiO 2 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·m 1/2 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 SiO 2 in matrix was found above 1200 °C. 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 °C, and showed much higher strength retention ratio than C/mullite composites after annealing at 1600 °C.

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          Author and article information

          Journal
          J Adv Ceram
          Journal of Advanced Ceramics
          Tsinghua University Press and Springer-Verlag Berlin Heidelberg (USA )
          2227-8508
          2226-4108
          01 June 2019
          01 October 2019
          : 8
          : 2
          : 218-227
          Affiliations
          aSchool of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, Hunan, China
          bScience and Technology on Advanced Ceramic Fibers & Composites Laboratory, National University of Defense Technology, Changsha 410073, China
          Author notes
          *Corresponding authors: Q. Ma, E-mail: nudtmqs1975@ 123456163.com ; W. Mao, E-mail: ssamao@ 123456126.com
          Article
          s40145-018-0307-z
          10.1007/s40145-018-0307-z
          Copyright © The Author(s)

          This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See https://creativecommons.org/licenses/by/4.0/.

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