Fabrication process and growth mechanism of novel micro-stack PyC interphase with different textures |
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| Authors: | Xu Pang Mengshan Zhang Wang Hong Zhongwei Zhang Longbiao Li Aijun Li Weijie Li Yufeng Liu |
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| Affiliation: | 1. Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, P. R. China;2. Beijing Mechanical Equipment Institute, Beijing, P. R. China;3. College of Civil Aviation, Nanjing University of Aeronautics and Astronautics, Nanjing, P. R. China;4. Shaoxing Institute of Technology, Shanghai University, Shanghai, P. R. China;5. School of Civil Engineering, Beijing Jiaotong University, Beijing, P. R. China;6. Science and Technology of Advanced Functional Composites Laboratory, Aerospace Research Institute of Materials and Processing Technology, Beijing, P. R. China |
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| Abstract: | Pyrolytic carbon (PyC) interphase plays a crucial role in the mechanical properties of fiber-reinforced ceramic matrix composites. In this research, a novel micro-stack PyC interphase with different PyC textures was designed and fabricated by changing the deposition parameters during the chemical vapor infiltration process. The growth mechanism of the micro-stack PyC interphase with different texture were also studied by experimental characterizations and kinetic calculations, and the results show that the content ratio of (C2H2 + C2H4) to C6H6 gas intermediate is a key parameter to control the texture types of PyC interphase. Furthermore, the value of orientation angle (OA) value, thickness, and modulus of the micro-stack PyC interphase were further characterized by high resolution TEM (HRTEM), scanning electronic microscopy, and nanoindentation. Finally, the tensile testing of mini-Cf/PyC/SiC composites was conducted, and the results showed that the tensile strength of mini-Cf/PyC/SiC composites with micro-stack PyC interphase is approximately 40% higher than that containing single high texture PyC interphase. The improvements on the tensile strength of Cf/PyC/SiC composites prove the significant advantages of micro-stack PyC interphase. |
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| Keywords: | mechanical properties micro-stack PyC interphase PyC growth model PyC texture |
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