Overaluminizing of a CoNiCrAlY Coating by Inward and Outward Diffusion Treatments |
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Authors: | Samira Mohseni Bababdani Farhad Shahriari Nogorani |
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Affiliation: | 1. Department of Materials Science and Engineering, Shiraz University of Technology, 71557-13876, Shiraz, Iran
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Abstract: | Overaluminizing is a commercially accepted treatment to enhance high temperature oxidation resistance of MCrAlY overlay coatings. In the current investigation, a low pressure plasma-sprayed CoNiCrAlY coating was aluminized by two different growth modes: outward growth and inward growth. The resultant microstructures were characterized by means of scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction analysis. The results showed that the final microstructure of both types of overaluminized coatings was similar and included Al-rich NiAl and Ni-rich NiAl zones from the top to the bottom. The details of the microstructures are discussed and compared with the results of simple aluminizing of the nickel-based substrate. |
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