Effects of high temperature heat treatment on the micro structure and mechanical performance of C/C-SiC composite materials

MA Fei; LUO Hao; SUN Shouye; SHI Xiangdong; LUO Ruiying; GUO Lingyan

doi:10.13801/j.cnki.fhclxb.20240202.001

Volume 41 Issue 8

Aug. 2024

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MA Fei, LUO Hao, SUN Shouye, et al. Effects of high temperature heat treatment on the micro structure and mechanical performance of C/C-SiC composite materials[J]. Acta Materiae Compositae Sinica, 2024, 41(8): 4375-4385. doi: 10.13801/j.cnki.fhclxb.20240202.001

Citation:

MA Fei, LUO Hao, SUN Shouye, et al. Effects of high temperature heat treatment on the micro structure and mechanical performance of C/C-SiC composite materials[J]. Acta Materiae Compositae Sinica, 2024, 41(8): 4375-4385. doi: 10.13801/j.cnki.fhclxb.20240202.001

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Effects of high temperature heat treatment on the micro structure and mechanical performance of C/C-SiC composite materials

doi: 10.13801/j.cnki.fhclxb.20240202.001

1.
State Key Laboratory of Engine Reliability, Weichai Power CO., LTD., Weifang 261000, China
2.
Research Institute for Frontier Science, Beihang University, Beijing 100191, China

Funds: Open Project of National Key Laboratory for Internal Combustion and Power Systems (WCDL-GH-2020-0242)

Received Date: 2023-11-06
Accepted Date: 2023-12-29
Rev Recd Date: 2023-12-28

Available Online: 2024-02-04

Publish Date: 2024-08-01

Abstract

Abstract

The microstructure and properties of C/C-SiC composites prepared by reactive melt infiltration (RMI) are significantly affected by post-heat treatment. In order to study the effect and mechanism of post-heat treatment on the microstructure and mechanical properties of C/C-SiC composites prepared by RMI, the isothermal chemical vapor infiltration (CVI) process was used to deposit pyrolytic carbon matrix in the carbon fiber preform, and C/C porous bodies with a density of 1.2 g/cm³ were prepared by using natural gas as carbon source gas and nitrogen as carrier gas and dilution gas. Then C/C-SiC composites were prepared by reactive melt infiltration method. The effects of different post-heat treatment temperatures on the phase composition, internal stress and mechanical properties of C/C-SiC composites were studied. The prepared C/C-SiC composites were treated at 1300℃, 1500℃ and 1700℃, respectively. The effects of post-high temperature heat treatment on the density, porosity, matrix composition, internal stress and bending properties of the C/C-SiC composites were investigated. The results show that after heat treatment at 1300℃, 1500℃ and 1700℃, the density of C/C-SiC composites decreases, the porosity increases, the content of SiC matrix increases, the distribution of SiC matrix becomes more extensive, and the residual Si content decreases significantly with large pores caused by residual Si volatilization. At 1300℃, 1500℃ and 1700℃, the bending strength increases first and then decreases. At 1500℃, the bending strength reaches a maximum of 296.52 MPa. With the increase of the post-treatment temperature, the bending modulus decreases, and at 1700℃, the bending strength decreases the most.
- C/C-SiC,
- RMI,
- high-temperature thermal treatment,
- flexural properties,
- microscopic structure
Long Abstrsct
Innovation Points

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References(24)

References

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