https://doi.org/10.1140/epjp/s13360-023-03816-6
Regular Article
Analysis and evolution on diffusional stability of nickel aluminide bond coat via nickel electro-plating
1
School of Material Science and Engineering, Beijing Institute of Technology, Beijing, China
2
Department of Materials Engineering, NED University of Engineering and Technology, Karachi, Pakistan
Received:
29
November
2022
Accepted:
15
February
2023
Published online:
10
March
2023
Aircraft and aero-engine applications have manipulated nickel aluminide coatings for their corrosion resistance and oxidation resistance in high-temperature thermal barrier coatings. The purpose of this investigation is to develop a novel diffusion barrier pure Al-rich β-NiAl bond coat. To coat the K-403 superalloy substrate, both with and without a pre-electro-deposited nickel layer, aluminide coatings are deposited using in situ chemical vapor deposition (CVD). The material characterization techniques, scanning electron microscopy, energy-dispersive spectroscopy and X-ray diffraction patterns have revealed double-layered structure, outer-layer Al-rich β-NiAl and inner inter-diffusion zone. The outer-layer β-NiAl coatings formed onto the K-403 superalloy substrate is hyper-stoichiometric aluminum rich 44.76 at% Al without nickel coating. It was found that the inter-diffusion zone (IDZ) had a thickness of about 8 µm. The alloying element concentration increases steadily from exterior to the interior of the coating’s depth and develops impure Al-rich β-NiAl coatings. On the contrary, the outer-layer β-NiAl coatings formed onto the K-403 superalloy substrate are hyper-stoichiometric aluminum-rich 44.92 at% Al with nickel coating. It was found that the inter-diffusion zone (IDZ) had a thickness of about 3 µm. The Al-rich β-NiAl phase formed at the surface of the aluminized substrate is pure because nickel-deposited layer constrained the depletion of substrate.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
