| Microstructure and physical properties of SiCf/SiC composites fabricated by the CVI/LSI/PIP hybrid process |
| Young-Seok Jeong1,2, Min-Ho Jang3, Jung-Won Kim3, Kyoon Choi1, Ho Gyu Yoon2 |
1Icheon Branch, Korea Institute of Ceramic Engineering and Technology, Icheon, 17303, Korea
2Department of Material Science and Engineering, Korea University, Seoul, 02841, Korea
3Orange E&C, Gumi, 39171, Korea |
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Received: July 6, 2023; Revised: September 26, 2023 Accepted: October 8, 2023. Published online: November 21, 2023. |
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| ABSTRACT |
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The mechanical properties of SiCf/SiC composites depend on the microstructure of matrix, fiber and interphase. Therefore, the technology to control the microstructure of those components can be key to determining its application in the future. In this study, SiCf/SiC composite with a fiber volume fraction of 30 vol% was prepared using the CVI/LSI/PIP hybrid process. The apparent density and residual silicon of the prepared composite were measured to be 2.77 g/cm3 and 2 vol%, respectively. As a result of evaluatingthe tensile strength, the elastic modulus, PLS, and UTS of the SiCf/SiC composite at 1400 °C were measured to be 152.3 GPa, 125.1 MPa, and 144.1 MPa, respectively. Additionally, the crystallinity of the PyC interphase in SiCf/SiC composites was quantified using HRTEM, and the effect of the microstructure of the SiC matrix and PyC interphase on the mechanical properties discussed. |
| Key words:
SiCf/SiC composite · PyC interphase · CVI/LSI/PIP hybrid process · High-temperature strength |
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