The effect on the tensile properties of PIP-processed SiC/SiC composite of a chemical vapor-infiltrated SiC layer overlaid on the pyrocarbon interface layer |
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| Affiliation: | 1. Aeronautical Technology Directorate, Japan Aerospace Exploration Agency, 6-13-1 Osawa, Mitaka-shi, Tokyo 181-0015, Japan;2. Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba 278-8510, Japan;1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China;2. College of Materials and Mineral Resources, Xi’an University of Architecture and Technology, Xi’an, Shaanxi 710055, China;1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China;2. Chongyi Zhangyuan Tungsten Co., Ltd, Ganzhou, 341000, China;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, PR China;2. College of Materials and Mineral Resources, Xi''an University of Architecture and Technology, Xi''an, Shaanxi 710055, PR China;1. OASIS, Muroran Institute of Technology, Muroran 050-8585, Japan;2. Graduated School of Engineering, Muroran Institute of Technology, Muroran 050-8585, Japan |
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| Abstract: | A chemical vapor-infiltrated (CVI) SiC layer is often deposited on the pyrocarbon (PyC) fiber–matrix interface layer in SiC fiber-reinforced SiC matrix (SiC/SiC) composites. It is normally applied to protect the PyC layer from reacting with molten Si or sintering aids during manufacturing, and to guard against the effects of high temperature, oxidation and moisture during use. In this study, we investigated the effect of this SiC layer on the tensile properties of a composite. Tensile tests of our composite samples showed the SiC layer to have no noticeable effects on its ultimate load or fracture strain, whereas it decreased the load-to-strain ratio and proportional limit. The test results were analyzed by carrying out element tests on filaments and fiber bundle samples, fracture mirror analysis of pullout fibers, and finite element analysis (FEA) of residual thermal stress around the interface. |
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| Keywords: | A SiC fiber-reinforced SiC matrix (SiC/SiC) composites B chemical vapor-infiltrated (CVI) SiC layer C Tensile properties |
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