Volume 39, Issue 1 (Journal of Advanced Materials-Spring 2020)                   jame 2020, 39(1): 1-12 | Back to browse issues page

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Shahriari Nogorani F, afari M, Taghipoor M A, Atefi A. Formation and Evaluation of Oxidation Behavior of Zirconia- Aluminide Coating on Nickel- Based Alloy. jame. 2020; 39 (1) :1-12
URL: http://jame.iut.ac.ir/article-1-1039-en.html
1- Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, Iran. , shahriari@sutech.ac.ir
Abstract:   (2766 Views)
Practical applications of thermal barrier coatings with aluminide bond-coats are limited due to oxide scale spallation of the aluminide coating under applied thermal stresses. Considering the positive effects of oxygen-active elements or their oxides on the high temperature oxidation behavior, in this research zirconia was introduced into an aluminide coating. For this purpose, a Watts type bath was used to electroplate a layer of Ni-ZrO2 composite on a Ni-based substrate. Aluminizing was performed using the conventional two-step process at 760 and 1080 °C. Microstructural characterization of coatings in the as-coated conditions and after cyclic oxidation via 5-hour cycles at 1050 °C was performed using electron microscopy, energy dispersive spectroscopy and X-ray diffractometry. The results showed that the general three-zone microstructure of the simple high activity aluminide coatings develops below the pre-deposited nickel-zirconia layer and latter converts to a nearly un-alloyed porous NiAl. In spite of its porous surface layer, the zirconia modified coating has a higher oxidation resistance than the unmodified aluminide coating.
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Type of Study: Research | Subject: Surface engineering and coatings
Received: 2019/06/2 | Accepted: 2020/01/7 | Published: 2020/06/20

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