Effect of SiCnws on flexural strength of SiCf/HfC-SiC composites after impact and ablation |
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| Affiliation: | 1. School of Mechanics, Civil Engineering & Architecture, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;2. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China;1. College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;1. State Key Laboratory of Solidification Processing, Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials, Northwestern Polytechnical University, Xi’an, Shaanxi, 710072, China;2. School of Mechanics, Civil Engineering & Architecture, Northwestern Polytechnical University, Xi’an, Shaanxi, 710072, China;1. State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi’an 710072, China;2. School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710032, China |
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| Abstract: | SiC nanowires (SiCnws) modified SiCf/HfC-SiC composites were prepared by precursor infiltration and pyrolysis (PIP) and chemical vapor infiltration (CVI) methods. The microstructure, flexural strengths, impact and impact-ablation tests of the composites with and without SiCnws were investigated. The results showed that after introducing SiCnws, not only the retention rate of HfC ceramic produced by PIP was increased obviously, but also the fracture displacement of the modified composites was reduced due to the enhancement effect of SiCnws at interface between SiC fiber and matrix. After impact and impact-ablation, the strength retention of SiCnws modified composites was 91.6 % and 69.1 % respectively, higher than that of the composites without SiCnws (85.2 % and 54.8 %). As the impact resistance of the modified composites was improved by the pull-out and bridging of SiCnws, the ablation resistance of the impacted composites was enhanced as well. |
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| Keywords: | Ultra-high temperature ceramics Nanowire Flexural strength Impact Ablation |
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