Preparation and tensile behavior of SiCf/SiC mini composites containing different types and thicknesses of interphase |
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| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;2. National Key Laboratory of Science and Technology on High-strength Structural Materials, Central South University, Changsha 410083, China;3. Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China;1. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang, 330063, China;2. School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191, 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 |
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| Abstract: | SiC fiber-reinforced SiC matrix (SiCf/SiC) composites are promising materials for high-temperature structural applications. In this study, KD-II SiC fiber bundles with a C/Si ratio of approximately 1.25 and an oxygen amount of 2.53%, were used as reinforcement. PyC interphase, PyC-SiC co-deposition interphase I and II, with different thicknesses, and SiC matrix were deposited into the SiC fiber bundles by using chemical vapor infiltration (CVI) to form SiCf/SiC mini composites. When the thickness of the interphase is approximately 1000 nm, the ultimate tensile stress and strain of SiCf/SiC mini composites with PyC-SiC co-deposition interphase I can reach 1120.0 MPa and 0.72%, respectively, which are significantly higher than those of SiCf/SiC mini composites with a PyC interphase (740.0 MPa, 0.87%) and PyC-SiC co-deposition interphase II (645.0 MPa, 0.54%). The effect of thicknesses and types of interphase on tensile fracture behavior of mini composites and then the fracture mechanism are discussed in detail. |
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| Keywords: | Chemical vapor infiltration (CVI) Interphase Tensile behavior |
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