Microstructure studies of air-plasma-spray-deposited CoNiCrAlY coatings before and after thermal cyclic loading for high-temperature application |
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| Authors: | Dipak Kumar K N Pandey Dipak Kumar Das |
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| Affiliation: | 1. Mechanical Engineering Department, Motilal Nehru National Institute of Technology, Al ahabad-211004, India;2. Defense Metal urgical Research Laboratory, Hyderabad-500058, India |
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| Abstract: | In the present study, bond-coats for thermal barrier coatings were deposited via air plasma spraying (APS) techniques onto Inconel 800 and Hastelloy C-276 alloy substrates. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and atomic force microscopy (AFM) were used to investigate the phases and microstructure of the as-sprayed, APS-deposited CoNiCrAlY bond-coatings. The aim of this work was to study the suitability of the bond-coat materials for high temperature applications. Confirmation of nanoscale grains of theγ/γ′-phase was obtained by TEM, high-resolution TEM, and AFM. We concluded that these changes result from the plastic deformation of the bond-coat during the deposition, resulting in CoNiCrAlY bond-coatings with excellent thermal cy-clic resistance suitable for use in high-temperature applications. Cyclic oxidative stability was observed to also depend on the underlying metallic alloy substrate. |
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| Keywords: | thermal barrier coatings coating structure plasma spraying thermal cycle high-temperature applications microstructure studies |
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