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反应压力对炭纤维表面SiC涂层制备及组织结构的影响
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中南大学 粉末冶金研究院,湖南 长沙 410083

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Effect of Reaction Pressure on Synthesis and Microstructure of SiC Coating on Carbon Fiber
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Powder Metallurgy Research Institute, Central South University, Changsha 410083, China

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National Natural Science Foundation of China (U19A2088)

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    摘要:

    以硅粉为硅源,采用原位反应法在炭纤维表面制备了SiC涂层,并研究了反应压力对SiC涂层的制备、组织结构及抗氧化性能的影响。结果表明:常压下制备的涂层疏松多孔,表面有较多的SiC纳米线,而负压下制备的涂层致密均匀。静态氧化测试表明:与常压下制备的SiC涂层相比,负压下制备的SiC涂层抗氧化性能更好,主要是由于涂层致密均匀,能够更好地阻隔氧气的扩散。根据实验结果,探讨了反应压力对SiC涂层生长机理的影响。常压下,沉积粒子能量低,难以克服遮蔽效应,因此易形成疏松多孔的涂层;而负压下,沉积粒子能量高,表面扩散率高,易形成致密均匀的涂层。

    Abstract:

    The SiC coating on carbon fiber was synthesized via an in-situ reaction method using silicon powder as silicon source, and the effect of reaction pressure on the synthesis, microstructure, and oxidation resistance of SiC coating was investigated. The results show that SiC coating synthesized at the atmospheric pressure is loose and porous; numerous SiC nanowires are formed on it. In comparison, the SiC coating synthesized at the low pressure is uniform and dense. The isothermal oxidation test shows that the SiC coating synthesized at the low pressure has better oxidation resistance than the one synthesized at the atmospheric pressure, because the dense and uniform SiC coating can prevent oxygen from contacting with carbon fiber more effectively. Based on the experiment results, the growth mechanism of SiC coating influenced by the reaction pressure was proposed. At the atmospheric pressure, the kinetic energies of deposition particles are too low to overcome the shadowing effect, causing the formation of porous SiC coating. By contrast, the deposition particles have higher kinetic energies and surface diffusion rate on the surface of carbon fiber at the low pressure, thereby forming a uniform and dense SiC coating.

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谢翔旻,苏哲安,王亚峰,黄启忠.反应压力对炭纤维表面SiC涂层制备及组织结构的影响[J].稀有金属材料与工程,2021,50(11):3890~3895.[Xie Xiangmin, Su Zhean, Wang Yafeng, Huang Qizhong. Effect of Reaction Pressure on Synthesis and Microstructure of SiC Coating on Carbon Fiber[J]. Rare Metal Materials and Engineering,2021,50(11):3890~3895.]
DOI:10.12442/j. issn.1002-185X.20200669

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历史
  • 收稿日期:2020-09-03
  • 最后修改日期:2020-09-23
  • 录用日期:2020-10-21
  • 在线发布日期: 2021-11-25
  • 出版日期: 2021-11-24