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Research Article | Open Access

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

Donglin ZHAOa, Tong GUOb, Xiaomeng 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
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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 fiberC/SiCpyrolytic carbon (PyC) interphasetensile strengthWeibull modulus

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Journal of Advanced Ceramics
Volume 10 Issue 2,
April 2021
Pages 219-226
DOI: 10.1007/s40145-020-0432-3
Cite this article:
ZHAO D, GUO T, FAN X, et al. Effect of pyrolytic carbon interphase on mechanical properties of mini T800-C/SiC composites. Journal of Advanced Ceramics, 2021, 10(2): 219-226. https://doi.org/10.1007/s40145-020-0432-3
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10.1007/s40145-020-0432-3.T001Parameters of T800 carbon fiber

Fiber towsTensile strength (MPa)Tensile modulus (GPa)Failure strain (%)Density (g/cm3)Diameter (μm)Carbon content (%)
600055003001.81.85.296

10.1007/s40145-020-0432-3.T002Weibull distribution parameters and average strength of mini T800-C/SiC

SampleS0S1S2S3
Fiber volume fraction (%)20202020
m2.06.67.48.1
σ0 (MPa)86422364276
E(σ) (MPa)76 ± 6393 ± 70342 ± 53260 ± 37
Normalized tensile strength (MPa), Vf = 20%80380368304