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首页> 外文会议>Minerals, Metals and Materials Society >Effects of Hf Predeposition on the Morphology of an Aluminide Coating Produced on Single Crystal Ni Superalloy by Chemical Vapor Deposition
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Effects of Hf Predeposition on the Morphology of an Aluminide Coating Produced on Single Crystal Ni Superalloy by Chemical Vapor Deposition

机译：HF Predoposition对单晶Ni超合金制备的铝化涂层形态的影响通过化学气相沉积

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摘要

The (100) surface of a single crystal Ni superalloy was exposed to HfCl_4 and H_2 at 1150 °C in a hot-wall chemical vapor deposition (CVD) reactor. The Hf deposition step was immediately followed by aluminizing the alloy surface in the same reactor using AlCl_3 and H_2. The effects of the Hf predeposition step on the development of coating microstructure were examined. Without Hf predeposition, the aluminide coating formed after 20 min of aluminizing was continuous and its microstructure was distinctly columnar. But, with 0.5 to 30 min of Hf predeposition, the aluminide coating layer became thinner and no longer continuous. Also, the coating surface became topologically irregular and compositionally segregated. It appeared that the predeposited layer of Hf (or Hf-rich phases) on the alloy surface acted as a diffusion barrier for the outward diffusion of Ni required to form a continuous β-NiAl layer. Morphological changes observed with increasing the Hf predeposition time were discussed in the context of this diffusion barrier phenomenon.
机译：在热壁化学气相沉积（CVD）反应器中，在1150℃下暴露于1150℃的HFCl_4和H_2的（100）表面。立即通过AlCl_3和H_2将HF沉积步骤紧接着通过铝合金表面在相同的反应器中涂布。研究了HF预沉积步骤对涂层微观结构发展的影响。在没有HF的预热，20分钟铝化后形成的铝化涂层是连续的，其微观结构明显柱状。但是，随着HF预沉积的0.5至30分钟，铝化涂层变得更薄，不再连续。而且，涂层表面变得拓扑上不规则和组成的偏析。似乎，合金表面上的预遗传层（或富含HF的相）用作形成连续β-in层所需的Ni的向外扩散的扩散屏障。在这种扩散阻隔现象的背景下讨论了随着增加HF预辨别时间观察到的形态学变化。

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