Mechanical and microwave dielectric properties of SiCf/SiC composites with BN interphase prepared by dip-coating process |
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| Authors: | Haitao Liu Hao Tian |
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| Affiliation: | 1. Key Laboratory of Advanced Ceramic Fiber and Composites, College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China;2. Science and Technology on Scramjet Laboratory, College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China;1. Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea;2. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 130-743, Republic of Korea;3. Sialon Group, National Institute for Materials Science, Tsukuba-shi, Ibaraki 305-0044, Japan;1. Key Lab. of Advanced Ceramic Fiber and Composites, College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China;2. Science and Technology on Scramjet Laboratory, College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China;1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;2. Department of Physics, Konkuk University, Seoul 05029, Republic of Korea;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, PR China;2. Key Laboratory for Advanced Corrosion and Protection of Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, PR China |
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| Abstract: | The BN interphase of SiC fiber-reinforced SiC matrix (SiCf/SiC) composites was fabricated by dip-coating process with boric acid and urea as precursor. The results show that the tensile strength of SiC fiber decreases about 30% after BN coating treatment, but the BN coating has little influence on the electrical resistivity of SiC fiber. Compared with the as-received SiCf/SiC composites, the SiCf/SiC composites with BN interphase exhibit a toughened fracture behavior, and the flexural strength is about 2 times that of the as-received SiCf/SiC composites. From the microstructural analysis, it can be confirmed that the BN interphase plays a key part in weakening interfacial bonding, which can improve the mechanical properties of SiCf/SiC composites remarkably. Owing to the close dielectric properties between SiC and BN, the complex permittivity of SiCf/SiC composites with and without the BN interphase is similar. |
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