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Journal of Advanced Ceramics 2021, 10(4): 758-767 https://doi.org/10.1007/s40145-021-0470-5
Research Article | Open Access | Issue | Published: 05 August 2021

Enhanced mechanical property and tunable dielectric property of SiCf/SiC-SiBCN composites by CVI combined with PIP

Show Author's Information Chaokun SONGa,  Yongsheng LIUa,  Fang YEa( ),  Laifei CHENGa( ),  Pengfei ZHANGb,  Nan CHAIc
Science and Technology on Thermostructure Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China
Beijing Spacecrafts, Beijing 100000, China
Institut für Materialwissenschaft, Technische Universität Darmstadt, Darmstadt D-64287, Germany
Keywords:
mechanical property, chemical vapor infiltration (CVI), SiCf/SiC-SiBCN composites, polymer infiltration pyrolysis (PIP), electromagnetic characteristic
Cite this article:
SONG C, LIU Y, YE F, et al. Enhanced mechanical property and tunable dielectric property of SiCf/SiC-SiBCN composites by CVI combined with PIP. Journal of Advanced Ceramics, 2021, 10(4): 758-767. https://doi.org/10.1007/s40145-021-0470-5
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Abstract Full text About this article

The SiBCN matrix via chemical vapor infiltration (CVI) or/and polymer infiltration pyrolysis (PIP) technologies was orderly introduced to SiCf/SiC composites to optimize the mechanical property and electromagnetic (EM) shielding effectiveness simultaneously. The BN interface with the thickness of 350 nm was designed to obtain a little stronger interface bonding. The flexural strength of SiCf/SiC-SiBCN composites reached 545.45±29.59 MPa thanks to the crack deflection between the CVI SiC and CVI SiBCN, as well as CVI SiBCN and PIP SiBCN matrix because of the modulus difference between them. The fracture toughness (KIC) with the value of 16.02±0.94 MPa·m1/2 was obtained owing to the extension of crack propagation path. The adverse effect of stronger interface bonding was eliminated by the design of matrix microstructure for SiCf/SiC-SiBCN composites. The thermal conductivity in the thickness direction was 7.64 W·(m·K)-1 at 1200 ℃ and the electric resistivity decreased to 1.53×103 Ω·m. The tunable dielectric property was obtained with the coordination of wave-absorption CVI SiBCN matrix and impedance matching PIP SiBCN matrix, and the total shielding effectiveness (SET) attained 30.01 dB. It indicates that the SiCf/SiC-SiBCN composites have great potential to be applied as structural and functional materials.


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About this article

Enhanced mechanical property and tunable dielectric property of SiCf/SiC-SiBCN composites by CVI combined with PIP

Show Author's information Chaokun SONGa, Yongsheng LIUa, Fang YEa( ), Laifei CHENGa( ), Pengfei ZHANGb, Nan CHAIc
Science and Technology on Thermostructure Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China
Beijing Spacecrafts, Beijing 100000, China
Institut für Materialwissenschaft, Technische Universität Darmstadt, Darmstadt D-64287, Germany

Abstract

The SiBCN matrix via chemical vapor infiltration (CVI) or/and polymer infiltration pyrolysis (PIP) technologies was orderly introduced to SiCf/SiC composites to optimize the mechanical property and electromagnetic (EM) shielding effectiveness simultaneously. The BN interface with the thickness of 350 nm was designed to obtain a little stronger interface bonding. The flexural strength of SiCf/SiC-SiBCN composites reached 545.45±29.59 MPa thanks to the crack deflection between the CVI SiC and CVI SiBCN, as well as CVI SiBCN and PIP SiBCN matrix because of the modulus difference between them. The fracture toughness (KIC) with the value of 16.02±0.94 MPa·m1/2 was obtained owing to the extension of crack propagation path. The adverse effect of stronger interface bonding was eliminated by the design of matrix microstructure for SiCf/SiC-SiBCN composites. The thermal conductivity in the thickness direction was 7.64 W·(m·K)-1 at 1200 ℃ and the electric resistivity decreased to 1.53×103 Ω·m. The tunable dielectric property was obtained with the coordination of wave-absorption CVI SiBCN matrix and impedance matching PIP SiBCN matrix, and the total shielding effectiveness (SET) attained 30.01 dB. It indicates that the SiCf/SiC-SiBCN composites have great potential to be applied as structural and functional materials.

Keywords: mechanical property, chemical vapor infiltration (CVI), SiCf/SiC-SiBCN composites, polymer infiltration pyrolysis (PIP), electromagnetic characteristic

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Publication history

Received: 29 November 2020
Revised: 24 February 2021
Accepted: 05 March 2021
Published: 05 August 2021
Issue date: August 2021

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© The Author(s) 2021

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 52072304, 51632007, and 51872229), the 111 Project of China (B08040), and the National Science and Technology Major Project (Grant No. 2017-VI-0007-0077).

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