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首页> 外文期刊>Journal of Materials Research >Improved oxidation resistance of CoNiCrAITaHfY/Co coating on C/C composites by vapor phase surface alloying
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Improved oxidation resistance of CoNiCrAITaHfY/Co coating on C/C composites by vapor phase surface alloying

机译：通过气相表面合金化改善C / C复合材料上CoNiCrAITaHfY / Co涂层的抗氧化性

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摘要

A CoNiCrAITaHfY/Co composite coating was prepared on the etched C/C composites by using duplex vapor phase surface alloying treatments, i.e., Co alloying and Co-Ni-Cr-AI-Ta-Hf-Y alloying. Microstructures and oxidation behavior of the coated C/C composites were analyzed by scanning electron microscopy, energy-dispersive spectroscopy, and X-ray diffraction. The result showed that the CoNiCrAITaHfY/Co composite coating, 25 μm in thickness, was compact and composed of CrCoTa, AICo_2Ta, Al_xCr_y, Al_xNi_y, and Co. The coating adhesion can be enhanced by microwave plasma chemical vapor deposition etching of matrix surface and adding a Co intermediate layer between the CoNiCrAITaHfY top layer and C/C composites substrate. The honeycomb structure after etching was helpful to alloying element absorb and diffuse into substrate surface, and the composite coating continuation was improved by the Co buffer layer. After exposing in air for 180 min at 1000 ℃, the bulk C/C composites volatilized while the loss rate of coated C/C composites was 0.82%, showing an improved oxidation resistance. Mixed oxides mainly containing Al203 and Cr_2O_3 were formed in the composite coating surface and protected the C/C composites from oxidation in air.
机译：通过使用双相气相表面合金化处理，即Co合金化和Co-Ni-Cr-Al-Ta-Hf-Y合金化，在蚀刻的C / C复合材料上制备CoNiCrAlTaHfY / Co复合涂层。通过扫描电子显微镜，能量分散光谱和X射线衍射分析了涂层C / C复合材料的微观结构和氧化行为。结果表明，厚度为25μm的CoNiCrAITaHfY / Co复合涂层致密，由CrCoTa，AlCo_2Ta，Al_xCr_y，Al_xNi_y和Co组成。通过微波等离子体化学气相沉积法刻蚀基体表面并添加，可以提高涂层的附着力。 CoNiCrAlTaHfY顶层和C / C复合材料衬底之间的Co中间层。腐蚀后的蜂窝状结构有助于合金元素吸收和扩散到基底表面，并且通过Co缓冲层改善了复合涂层的连续性。在1000℃下暴露于空气中180分钟后，块状C / C复合材料挥发，而包覆的C / C复合材料的损失率为0.82％，显示出更好的抗氧化性。在复合涂层表面形成了主要包含Al2O3和Cr_2O_3的混合氧化物，并保护了C / C复合材料免受空气中的氧化。

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  • 来源
    《Journal of Materials Research》 |2020年第5期|500-507|共8页
  • 作者

    Qi Guo; Tianxu Meng; Wenqiang Ding; Wen Xi; Naiming Lin; Shengwang Yu; Xiaoping Liu;

  • 作者单位

    Research Institute of Surface Engineering Taiyuan University of Technology Taiyuan 030024 China and Taiyuan Heavy Industry Co. Ltd. Smelting & Casting Subco Taiyuan 030024 China;

    Research Institute of Surface Engineering Taiyuan University of Technology Taiyuan 030024 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
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