Mechanical and dielectric properties of SiCf/BN/SiBCN composites via different synthesis technologies |
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| Affiliation: | 1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Heilong Jiang, Harbin, 150080, China;2. Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology, Harbin Institute of Technology, Heilong Jiang, Harbin, 150080, China;3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Heilong Jiang, Harbin, 150001, 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, PR China;2. Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, PR China;1. School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191, China;2. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang, 330063, China;1. School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China;2. School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China |
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| Abstract: | SiC fibers reinforced SiBCN ceramic matrix composites (SiCf/BN/SiBCN composites) were synthesized by direct chemical vapor infiltration (CVI), polymer infiltration pyrolysis (PIP) or chemical vapor infiltration combined with polymer infiltration pyrolysis (CVI + PIP). It is shown that the insertion of a continuous and dense SiBCN matrix via the CVI process improves the flexural strength and modulus. Interface debonding and fiber pullout happened with 50–100 nm BN interface in CVI and CVI + PIP SiCf/BN/SiBCN composites. The relative complex permittivity was measured in X-band. Higher ε′′ values in CVI-containing composites can be observed, which can be attributed to the accumulation of C and SiC phases and a multilayer matrix. Strong electromagnetic wave attenuation ability was obtained with high dielectric loss. |
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| Keywords: | CVI PIP Flexural strength Dielectric property |
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