Formation and Evaluation of Oxidation Behavior of Zirconia- Aluminide Coating on Nickel- Based Alloy

Authors

  • Atefi, A. 2- Department of Mechanical Engineering, Islamic Azad University- Khomeinishahr Branch, Isfahan, Iran.
  • Safari, M. 1- Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, Iran.
  • Shahriari Nogorani, F. 1- Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, Iran.
  • Taghipour, M. 2- Department of Mechanical Engineering, Islamic Azad University- Khomeinishahr Branch, Isfahan, Iran.
Abstract:

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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Journal title

volume 39  issue 1

pages  1- 12

publication date 2020-05

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