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首页> 外文会议>High temperature ceramic matrix compositei III >Structure and Materials of a Multi-Layer Coating for the Oxidation Protection of C/C Composites up to 1700℃
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Structure and Materials of a Multi-Layer Coating for the Oxidation Protection of C/C Composites up to 1700℃

机译：1700℃以下C / C复合材料抗氧化多层涂层的结构与材料

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摘要

A four-layer coating for the oxidation protection of C/C composites was presented on the basis of investigating failure mechanism of a three-layer coating by XRD, SEM, TEM, Auger and Raman. The three-layer coating, which can be used for 30 hours at 1650℃, consisted of a conversion SiC layer, a CVD SiC layer and a liquid-reaction Si-W layer. The failure process was essentially caused by interfacial reaction which produces gaseous pressure of higher than the ambient with non-homogeneous nucleation, growth, bursting and sealing of bubbles. Holes were formed on the surface of coating when the bubbles are large enough that the burst bubbles can not be sealed in time by the viscous flow. W ion increases oxygen diffusion through the oxide film of the coating, and accelerates the failure process. The four-layer coating consists of a conversion SiC inner layer, a CVD SiC barrier layer, a Si-Zr layer for increasing the interfacial stability of CVD SiC and outer layer, a sol-gel silica outer layer for decreasing oxygen diffusion.
机译：在通过XRD，SEM，TEM，Auger和Raman研究了三层涂层失效机理的基础上，提出了一种用于C / C复合材料氧化防护的四层涂层。该三层涂层可在1650℃下使用30个小时，由转化SiC层，CVD SiC层和液体反应Si-W层组成。失效过程主要是由界面反应引起的，该界面反应产生的气压高于环境压力，并且产生非均质的成核，生长，破裂和气泡密封。当气泡足够大以致破裂的气泡不能被粘性流及时密封时，在涂层表面上会形成孔。 W离子增加了氧通过涂层氧化膜的扩散，并加速了破坏过程。该四层涂层由转化SiC内层，CVD SiC阻挡层，用于增加CVD SiC和外层的界面稳定性的Si-Zr层，以及用于减少氧扩散的溶胶-凝胶二氧化硅外层组成。

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  • 来源
  • 会议地点 Osaka(JP);Osaka(JP);Osaka(JP);Osaka(JP)
  • 作者

    L. Cheng; Y. Xu; L. Zhang;

  • 作者单位

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an Shaanxi 710072, P.R. China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an Shaanxi 710072, P.R. China;

    State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an Shaanxi 710072, P.R. China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TQ174.58;
  • 关键词

    multi-layer coating; oxidation protection; C/C composites;

    机译：多层涂层氧化保护；碳/碳复合材料;

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