Ablation behavior and mechanism of SiCf/Cf/SiBCN ceramic composites with improved thermal shock resistance under oxyacetylene combustion flow |
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| Affiliation: | 1. Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People''s Republic of China;2. University of Chinese Academy of Sciences, Beijing 100049, People''s Republic of China;1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Heilong Jiang, Harbin 150080, China, China;2. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Heilong Jiang, Harbin 150001, China, China |
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| Abstract: | The ablation properties and mechanisms (under oxyacetylene combustion) together with thermal shock behavior of SiCf/Cf/SiBCN ceramic composites were investigated. The solid ablation products are primarily amorphous SiO2 and cristobalite. The primary ablation mechanisms include fiber and ceramic matrix oxidation, evaporation of B2O3 (l) and SiO2 (l), and mechanical exfoliation. SiCf/Cf/SiBCN has a significantly low mass ablation rate and a desirable linear ablation rate. The combination of crack deflection caused by SiC and carbon fibers, fiber pull-out and debonding improves thermal shock resistance and thus leads to the absence of surface macrocracks. |
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| Keywords: | A Sintering B Composites C Corrosion C Thermal shock resistance |
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