Oxidation behavior of oxidation protective coatings for PIP-C/SiC composites at 1500 °C |
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Authors: | Yang Xiang Wei LiSong Wang Zhao-hui Chen |
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Affiliation: | Key Laboratory of Advanced Ceramic Fibers & Composites, National University of Defense Technology, Changsha 410073, People's Republic of China |
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Abstract: | Three-dimensional carbon fiber reinforced silicon carbide (C/SiC) composites were fabricated by precursor infiltration and pyrolysis (PIP) with polycarbosilane as the matrix precursor, SiC coating prepared by chemical vapor deposition (CVD) and ZrB2-SiC/SiC coating prepared by CVD with slurry painting were applied on C/SiC composites, respectively. The oxidation of three samples at 1500 °C was compared and their microstructures and mechanical properties were investigated. The results show that the C/SiC without coating is distorted quickly. The mass loss of SiC coating coated sample is 4.6% after 2 h oxidation and the sample with ZrB2-SiC/SiC multilayer coating only has 0.4% mass loss even after oxidation. ZrB2-SiC/SiC multilayer coating can provide longtime protection for C/SiC composites. The mode of the fracture behavior of C/SiC composites was also changed. When with coating, the fracture mode of C/SiC composites became brittle. When after oxidation, the fracture mode of C/SiC composites without and with coating also became brittle. |
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Keywords: | C/SiC composites Oxidation protective coating Slurry Chemical vapor deposition |
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