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In this work, the effects of carbon nanotubes (CNTs) on the microstructure evolution, thermal conductivity, and mechanical properties of Cf/SiC composites during chemical vapor infiltration (CVI) densification were investigated in detail. Compared with composites without CNTs, the thermal conductivity, flexural strength, flexural modulus, fracture toughness, interfacial shear strength, and proportional limit stress of specimens with CNTs of 4.94 wt% were improved by 117%, 21.8%, 67.4%, 10.3%, 36.4%, and 71.1%, respectively. This improvement was attributed to the role of CNTs in the division of inter-layer pores, which provided abundant vapor growth sites for the ceramic matrix and promoted densification of the whole composite. In addition, the high thermal conductivity network formed by the overlap of CNTs and the rivet strengthening effect of CNTs were beneficial for synergistic improvement of thermal conductivity and mechanical properties of the composites. Therefore, this study has practical significance for the development of thermal protection composite components with enhanced thermal conductivity and mechanical characteristics.


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Enhanced thermal conductivity and mechanical properties of 2D Cf/SiC composites modified by in-situ grown carbon nanotubes

Show Author's information Changhui Niu1Qing Zhang1( )Laifei Cheng1Fang Ye1Litong Zhang1Min Huang2,3( )Tao Yang3
Science and Technology on Thermostructure Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China
Civil Aviation Department, Zhejiang Institute of Communications, Hangzhou 311112, China
Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou 318000, China

Abstract

In this work, the effects of carbon nanotubes (CNTs) on the microstructure evolution, thermal conductivity, and mechanical properties of Cf/SiC composites during chemical vapor infiltration (CVI) densification were investigated in detail. Compared with composites without CNTs, the thermal conductivity, flexural strength, flexural modulus, fracture toughness, interfacial shear strength, and proportional limit stress of specimens with CNTs of 4.94 wt% were improved by 117%, 21.8%, 67.4%, 10.3%, 36.4%, and 71.1%, respectively. This improvement was attributed to the role of CNTs in the division of inter-layer pores, which provided abundant vapor growth sites for the ceramic matrix and promoted densification of the whole composite. In addition, the high thermal conductivity network formed by the overlap of CNTs and the rivet strengthening effect of CNTs were beneficial for synergistic improvement of thermal conductivity and mechanical properties of the composites. Therefore, this study has practical significance for the development of thermal protection composite components with enhanced thermal conductivity and mechanical characteristics.

Keywords: microstructure, thermal conductivity, carbon nanotubes, mechanical properties, ceramic−matrix composites

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Publication history

Received: 15 September 2023
Revised: 06 November 2023
Accepted: 26 November 2023
Published: 18 January 2024
Issue date: January 2024

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© The Author(s) 2024.

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 52072304, 51872229, and 52172100), the 111 Project of China (Grant No. B08040), Science Center for Gas Turbine Project (Grant No. P2022-B-IV-002–001), Key Research and Development Program of Shaanxi (Grant Nos. 2022GY-367 and 2022GY-370), and the Open Fund of Zhejiang Provincial Key Laboratory for Cutting Tools (Grant No. ZD202108). We would like to thank the Analytical & Testing Center of Northwestern Polytechnical University for the kind assistance with electron microscopic characterization in this work.

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This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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