Influence of h-BN as additive on microstructure and oxidation mechanism of C/C-SiC composite |
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| Affiliation: | 1. National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials, Central South University, Changsha, 410083, PR China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, PR China;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;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. College of Science, Honghe University, Mengzi 661199, Yunnan, China;3. School of Resources and Environmental Engineering, Shandong University of Technology, Zibo 255049, Shandong, China;1. National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials, Central South University, Changsha 410083, China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, PR China;2. Ceramic Materials Engineering, University of Bayreuth, Bayreuth, 95447, Germany;3. College of Metallurgical Engineering, Hunan University of Technology, Zhuzhou, Hunan 412008, PR China |
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| Abstract: | Due to the favorable self-healing performance, hexagonal boron nitride (h-BN) as additive in the matrix can significantly influence the oxidation behavior and the kinetic characteristics of C/C-SiC composites. In this work, C/C-SiC composites modified by h-BN (C/C-BN-SiC) were prepared by low-temperature compression molding (LTCM), pyrolysis and liquid silicon infiltration (LSI). Microstructure, oxidation behavior and kinetic characteristics of the C/C-BN-SiC composites were investigated compared with the C/C-SiC composite. Because h-BN is non-wetted by liquid silicon, the h-BN flakes in the matrix can obstruct and prolong the flow path of silicon, and protect the carbon fibers from corrosion to a certain extent. The oxidation kinetics of composites occur in low and high temperature domains, with different oxidation-controlling mechanisms, and the addition of h-BN can hinder the inward diffusion and lead to the decline of carbon recession and apparent activation energy. |
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| Keywords: | C/C-SiC composites Hexagonal boron nitride Microstructure Kinetic characteristics Oxidation behavior |
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