Ablation property and oxide scale evolution of Y2O3 modified C/C-SiC composites fabricating via precursor infiltration and pyrolysis method |
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| Affiliation: | 1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;2. National Key Laboratory of Science and Technology for on High-strength Structural Materials, Central South University, Changsha 410083, China;3. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;1. Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology, School of Mechanical Engineering, Hebei University of Technology, Tianjin, PR China;2. School of Artificial Intelligence, Hebei University of Technology, Tianjin 300401, PR China;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. School of Material Science and Energy Engineering, Foshan University, Foshan 528000, China;3. Hunan Key Laboratory of applied Enviromental Photocatalysis, Changsha University, Changsha 410022, China;1. Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, Tokyo 152-8550, Japan;2. Laboratory for Zero-Carbon Energy, Institute of Innovative Research, Tokyo Institute of Technology, Tokyo 152-8550, Japan;1. School of Material Science and Engineering, Zhengzhou University, Henan 450001, China;2. Henan Vocational College of Information and Statistics, Zhengzhou 450008, China;3. School of Material Science and Engineering, Luoyang Institute of Science and Technology, Henan 471023, China;4. Sinosteel Luoyang Institute of Refractories Research Co., Ltd., Henan 471039, China;1. Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, PR China;2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, PR China |
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| Abstract: | Employed precursors of Y(NO3)3·6H2O and polycarbosilane, Y2O3 doped C/C-SiC composites were prepared by utilizing precursor infiltration and pyrolysis method. Results show that Y2O3 alters the composition of C/C-SiC composites with the generation of β-Y2Si2O7 and Y2O3 together with slight Y2SiO5, Y4.46(SiO4)3O and Y2C3. During ablation, β-Y2Si2O7 is stable and directly liquefied to rapidly fill in the empties in the substrate; the other three are transformed to δ-Y2Si2O7, evolving the oxide scale from SiO2-β-Y2Si2O7-Y2O3 (semi-fused) layer to SiO2-β-Y2Si2O7-δ-Y2Si2O7 ones. The ablation rates after ablation for 120 s were respectively 0.210 mg/s and 14.58 µm/s, severally decreased by 57.32% and 8.59% compared with that for 60 s. Further evaporation of SiO2 is suppressed and reconcilement of oxide layer is hence confirmed, implying decent anti-ablation resistance of oxide layer. |
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| Keywords: | Microstructure Ablation property Evolution of oxide scale |
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