In-situ testing of surface evolution of SiC during thermal ablation: Mechanisms of formation,flowing and growth of liquid silica beads |
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| Affiliation: | 1. AML, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China;2. Center for Mechanics and Materials, Tsinghua University, Beijing 100084, China;1. Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China;2. Beijing Institute of Near Space Vehicle’s System Engineering, Beijing 100076, China;1. Institute of Engineering Mechanics, Beijing Jiaotong University, Beijing 100044, China;2. Beijing Institute of Near Space Vehicle’s System Engineering, Beijing 100076, China;1. Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei 230027, PR China;2. Beijing Institute of Space Long March Vehicle, Beijing 100076, PR China;1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;2. National Key Laboratory of Science and Technology on Materials under Shock and Impact, Beijing 100081, China;3. Northwest Institute of Nuclear Technology, Xi’an 710024, China;4. State Key Laboratory of Laser Interaction with Matter, Xi’an 710024, China |
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| Abstract: | In this work we use real-time and in-situ observation technique at high temperature to capture the surface evolution of SiC (silicon carbide) specimen subjected to oxyacetylene torch flame. The obtained real-time images reveal clearly the nucleation, flowing and growth of the liquid silica beads on the surface of the specimen during thermal ablation process. A detailed model is developed to qualitatively analyze and interpret the mechanisms of the nucleation, flowing and the growth of the liquid silica beads. The result is expected to provide a better understanding of the ablation mechanism of SiC materials and serve as a preparatory work for the design and modification of the surface properties and topography of the materials to improve the thermal ablation resistance. |
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| Keywords: | In-situ testing Real-time observation Surface evolution Thermal ablation SiC |
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