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Morphology and Microstructure of Three-Dimensional Orthogonal C/SiC Composites Ablated by an Oxyacetylene Flame at 2900℃

机译:乙炔火焰在2900℃烧蚀的三维正交C / SiC复合材料的形貌和微观结构

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摘要

C/SiC composites were prepared by polycarbosilane infiltration pyrolysis and ablated by oxy-acetylene flame at 2900℃ for 180 s. The morphology and microstructure of C/SiC were observed by scanning electron microscopy. The phase transition and the composition were confirmed by energy-dispersive spectroscopy and X-ray diffraction. The ablation rates of the center region and the outer region were 2.5 and 1.1 μm/s, respectively. The ablated C/SiC was covered by a turbostratic carbon coating resulting from the pyrolysis of acetylene. White dross attached on the surface was composed of SiO_2 resulting from the sublimation and decomposition of SiC during ablation and oxidization of Si and SiC during cooling. The results indicated that the ablation was due to a combination of carbon coating deposition, decomposition of SiC, oxidation, and mechanical erosion.
机译:聚碳硅烷渗透热解法制备C / SiC复合材料,并在2900℃下经氧乙炔火焰烧蚀180 s。通过扫描电镜观察了C / SiC的形貌和微观结构。通过能量分散光谱和X射线衍射确认了相变和组成。中心区域和外部区域的消融速率分别为2.5和1.1μm/ s。烧蚀的C / SiC被乙炔热解产生的涡轮层碳涂层覆盖。附着在表面的白渣由SiO_2组成,SiO_2是由于烧蚀时SiC的升华和分解以及冷却时Si和SiC的氧化而形成的。结果表明,烧蚀是由于碳涂层沉积,SiC分解,氧化和机械腐蚀共同作用的结果。

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  • 作者

    Zhaofeng Chen; Bo Yan;

  • 作者单位

    College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;

    College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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  • 入库时间 2022-08-17 13:43:33

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