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Oxidation behaviors of carbon fiber reinforced SiC matrix composites (C/SiC) are one of the most noteworthy properties. For C/SiC, the oxidation behavior was controlled by matrix microcracks caused by the mismatch of coefficients of thermal expansion (CTEs) and elastic modulus between carbon fiber and SiC matrix. In order to improve the oxidation resistance, multilayer SiC-Si3N4 matrices were fabricated by chemical vapor infiltration (CVI) to alleviate the above two kinds of mismatch and change the local stress distribution. For the oxidation of C/SiC with multilayer matrices, matrix microcracks would be deflected at the transition layer between different layers of multilayer SiC-Si3N4 matrix to lengthen the oxygen diffusion channels, thereby improving the oxidation resistance of C/SiC, especially at 800 and 1000 ℃. The strength retention ratio was increased from 61.9% (C/SiC-SiC/SiC) to 75.7% (C/SiC-Si3N4/SiC/SiC) and 67.8% (C/SiC-SiC/Si3N4/SiC) after oxidation at 800 ℃ for 10 h.


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Oxidation behaviors of carbon fiber reinforced multilayer SiC-Si3N4 matrix composites

Show Author's information Xiaolin DANGaDonglin ZHAOaTong GUObXiaomeng FANa( )Jimei XUEaFang YEaYongsheng LIUaLaifei CHENGa
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China
Innovation Academy for Microsatellites of Chinese Academy of Sciences, Shanghai 201203, China

† Xiaolin Dang and Donglin Zhao contributed equally to this work.

Abstract

Oxidation behaviors of carbon fiber reinforced SiC matrix composites (C/SiC) are one of the most noteworthy properties. For C/SiC, the oxidation behavior was controlled by matrix microcracks caused by the mismatch of coefficients of thermal expansion (CTEs) and elastic modulus between carbon fiber and SiC matrix. In order to improve the oxidation resistance, multilayer SiC-Si3N4 matrices were fabricated by chemical vapor infiltration (CVI) to alleviate the above two kinds of mismatch and change the local stress distribution. For the oxidation of C/SiC with multilayer matrices, matrix microcracks would be deflected at the transition layer between different layers of multilayer SiC-Si3N4 matrix to lengthen the oxygen diffusion channels, thereby improving the oxidation resistance of C/SiC, especially at 800 and 1000 ℃. The strength retention ratio was increased from 61.9% (C/SiC-SiC/SiC) to 75.7% (C/SiC-Si3N4/SiC/SiC) and 67.8% (C/SiC-SiC/Si3N4/SiC) after oxidation at 800 ℃ for 10 h.

Keywords:

carbon fiber reinforced SiC matrix composites (C/SiC), multilayer SiC-Si3N4 matrices, elastic modulus mismatch, coefficient of thermal expansion (CTE) mismatch, oxidation resistance
Received: 26 May 2021 Revised: 07 September 2021 Accepted: 20 September 2021 Published: 11 January 2022 Issue date: February 2022
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Publication history

Received: 26 May 2021
Revised: 07 September 2021
Accepted: 20 September 2021
Published: 11 January 2022
Issue date: February 2022

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© The Author(s) 2021.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 52072303 and 51821091) and the National Science and Technology Major Project (No. J2019-VI-0014-0129). The authors would like to give their special thanks to Prof. Xiaowei Yin for his kind guidance and help on this work. The authors would like to thank the Analytical & Testing Center of Northwestern Polytechnical University for this work.

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