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Materials
Volume 13
Issue 7
10.3390/ma13071581
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Article

High-temperature Mechanical Properties and Their Influence Mechanisms of ZrC-Modified C-SiC Ceramic Matrix Composites up to 1600 °C

by
Jianjun Sha
1,2,*,
Shouhao Wang
3,
Jixiang Dai
1,2,
Yufei Zu
1,2,
Wenqiang Li
1 and
Ruyi Sha
1
1
State Key Laboratory of Structural Analyses for Industrial Equipment, Dalian University of Technology, Dalian 116024, China
2
Key Laboratory of Advanced Technology for Aerospace Vehicles, Liaoning Province, Dalian University of Technology, Dalian 116024, China
3
School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(7), 1581; https://doi.org/10.3390/ma13071581
Received: 28 February 2020 / Revised: 21 March 2020 / Accepted: 26 March 2020 / Published: 30 March 2020
(This article belongs to the Special Issue High Temperature Ceramic Materials)
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Abstract

In order to understand the influence of the mechanisms of ZrC nanoparticles on the high-temperature mechanical properties of C-SiC ceramic matrix composites, the mechanical properties were measured from room temperature (RT) to 1600 °C under vacuum. The microstructures features were characterized by scanning electron microscopy. In comparison with the composites without ZrC nanoparticles, the ZrC-modified composite presented better mechanical properties at all temperatures, indicating that the mechanical properties could be improved by the ZrC nanoparticles. The ZrC nanoparticles could reduce the residual silicon and improve the microstructure integrity of composite. Furthermore, the variation of flexural strength and the flexural modulus showed an asynchronous trend with the increase of temperature. The flexural strength reached the maximum value at 1200 °C, but the highest elastic modulus was obtained at 800 °C. The strength increase was ascribed to the decrease of the thermally-induced residual stresses. The degradation of mechanical properties was observed at 1600 °C because of the microstructure deterioration and the formation of strongly bonded fiber–matrix interface. Therefore, it is concluded that the high temperature mechanical properties under vacuum were related to the consisting phase, the matrix microstructure, and the thermally-induced residual stresses. View Full-Text
Keywords: ceramic matrix composite; high-temperature mechanical properties; microstructure evolution; UHTC nanoparticle; thermally-induced residual stress ceramic matrix composite; high-temperature mechanical properties; microstructure evolution; UHTC nanoparticle; thermally-induced residual stress
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MDPI and ACS Style

Sha, J.; Wang, S.; Dai, J.; Zu, Y.; Li, W.; Sha, R. High-temperature Mechanical Properties and Their Influence Mechanisms of ZrC-Modified C-SiC Ceramic Matrix Composites up to 1600 °C. Materials 2020, 13, 1581. https://doi.org/10.3390/ma13071581

AMA Style

Sha J, Wang S, Dai J, Zu Y, Li W, Sha R. High-temperature Mechanical Properties and Their Influence Mechanisms of ZrC-Modified C-SiC Ceramic Matrix Composites up to 1600 °C. Materials. 2020; 13(7):1581. https://doi.org/10.3390/ma13071581

Chicago/Turabian Style

Sha, Jianjun, Shouhao Wang, Jixiang Dai, Yufei Zu, Wenqiang Li, and Ruyi Sha. 2020. "High-temperature Mechanical Properties and Their Influence Mechanisms of ZrC-Modified C-SiC Ceramic Matrix Composites up to 1600 °C" Materials 13, no. 7: 1581. https://doi.org/10.3390/ma13071581

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