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The effect of pyrolytic carbon (PyC) thickness on the tensile property of mini T800 carbon fiber reinforced SiC matrix composites (C/SiC) was studied. PyC interphase was prepared by chemical vapor infiltration (CVI) process using C3H6-Ar as gas source, the PyC thickness was adjusted from 0 to 400 nm, and then the SiC matrix was prepared by CVI process using methyltrichlorosilane (MTS)-H2-Ar as precursor and gas source. The results showed that the tensile strength of mini T800-C/SiC increased first and then decreased with the increase of the PyC thickness. When the thickness of PyC was 100 nm, the average strength reached the maximum value of 393 ± 70 MPa. The Weibull modulus increased from 2.0 to 8.06 with the increase of PyC thickness, and the larger the Weibull modulus, the smaller the dispersion, which indicated that the regulation of PyC thickness was conducive to improve tensile properties.


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Effect of pyrolytic carbon interphase on mechanical properties of mini T800-C/SiC composites

Show Author's information Donglin ZHAOaTong GUObXiaomeng FANa( )Chao CHENa( )Yue MAa
Science and Technology on Thermostructure Composites Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China
Innovation Academy for Microsatellites of Chinese Academy of Sciences, Shanghai 201203, China

Abstract

The effect of pyrolytic carbon (PyC) thickness on the tensile property of mini T800 carbon fiber reinforced SiC matrix composites (C/SiC) was studied. PyC interphase was prepared by chemical vapor infiltration (CVI) process using C3H6-Ar as gas source, the PyC thickness was adjusted from 0 to 400 nm, and then the SiC matrix was prepared by CVI process using methyltrichlorosilane (MTS)-H2-Ar as precursor and gas source. The results showed that the tensile strength of mini T800-C/SiC increased first and then decreased with the increase of the PyC thickness. When the thickness of PyC was 100 nm, the average strength reached the maximum value of 393 ± 70 MPa. The Weibull modulus increased from 2.0 to 8.06 with the increase of PyC thickness, and the larger the Weibull modulus, the smaller the dispersion, which indicated that the regulation of PyC thickness was conducive to improve tensile properties.

Keywords:

T800 carbon fiber, C/SiC, pyrolytic carbon (PyC) interphase, tensile strength, Weibull modulus
Received: 20 July 2020 Revised: 12 October 2020 Accepted: 26 October 2020 Published: 27 February 2021 Issue date: April 2021
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Publication history
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Publication history

Received: 20 July 2020
Revised: 12 October 2020
Accepted: 26 October 2020
Published: 27 February 2021
Issue date: April 2021

Copyright

© The Author(s) 2020

Acknowledgements

This study was supported by the National Natural Science Foundation of China (Nos. 51702261, 51821091, and 51802263), the Natural Science Foundation of Shaanxi Province (Project No. 2019JQ-634), and the Fundamental Research Funds for the Central Universities.

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