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Layer-structured interphase, existing between reinforcing fiber and ceramics matrix, is an indispensable constituent for fiber-reinforced ceramic composites due to its determinant role in the mechanical behavior of the composites. However, the interphase may suffer high residual stress because of the mismatch of thermal expansion coefficients in the constituents, and this can exert significant influence on the mechanical behavior of the composites. Here, the residual stress in the boron nitride (BN) interphase of continuous SiC fiber-reinforced SiC composites was measured using a micro-Raman spectrometer. The effects of the residual stress on the mechanical behavior of the composites were investigated by correlating the residual stress with the mechanical properties of the composites. The results indicate that the residual stress increases from 26.5 to 82.6 MPa in tension as the fabrication temperature of the composites rises from 1500 to 1650 ℃. Moreover, the increasing tensile residual stress leads to significant variation of tensile strain, tensile strength, and fiber/matrix debonding mode of the composites. The sublayer slipping of the interphase caused by the residual stress should be responsible for the transformation of the mechanical behavior. This work can offer important guidance for residual stress adjustment in fiber-reinforced ceramic composites.


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Effects of interfacial residual stress on mechanical behavior of SiCf/SiC composites

Show Author's information Xiaowu CHEN1,2( )Guofeng CHENG3Jinshan YANG1,2Jianbao HU1,2Chunjin LIAO1,2Xiangyu ZHANG1,2Shaoming DONG1,2( )
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Structural Ceramics and Composites Engineering Research Center, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
Analysis and Testing Center for Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China

Abstract

Layer-structured interphase, existing between reinforcing fiber and ceramics matrix, is an indispensable constituent for fiber-reinforced ceramic composites due to its determinant role in the mechanical behavior of the composites. However, the interphase may suffer high residual stress because of the mismatch of thermal expansion coefficients in the constituents, and this can exert significant influence on the mechanical behavior of the composites. Here, the residual stress in the boron nitride (BN) interphase of continuous SiC fiber-reinforced SiC composites was measured using a micro-Raman spectrometer. The effects of the residual stress on the mechanical behavior of the composites were investigated by correlating the residual stress with the mechanical properties of the composites. The results indicate that the residual stress increases from 26.5 to 82.6 MPa in tension as the fabrication temperature of the composites rises from 1500 to 1650 ℃. Moreover, the increasing tensile residual stress leads to significant variation of tensile strain, tensile strength, and fiber/matrix debonding mode of the composites. The sublayer slipping of the interphase caused by the residual stress should be responsible for the transformation of the mechanical behavior. This work can offer important guidance for residual stress adjustment in fiber-reinforced ceramic composites.

Keywords:

ceramic matrix composites, Raman spectroscopy, mechanical properties, residual stress
Received: 21 March 2021 Revised: 13 June 2021 Accepted: 08 July 2021 Published: 28 October 2021 Issue date: January 2022
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Publication history

Received: 21 March 2021
Revised: 13 June 2021
Accepted: 08 July 2021
Published: 28 October 2021
Issue date: January 2022

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© The Author(s) 2021.

Acknowledgements

Authors appreciate the financial support of the research grant from the National Natural Science Foundation of China (No. 51902328), the research grant from the Science and Technology Commission of Shanghai Municipality (No. 19ZR1464700), the research grant from the Innovation Academy for Light-duty Gas Turbine, CAS (No. CXYJJ20- QN-09), the research grant from the Chinese Academy of Sciences (No. QYZDY-SSW-JSC031), and the research grant from the Key Deployment Projects of the Chinese Academy of Sciences (No. ZDRW-CN-2019-01).

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