Hot corrosion behavior of Al2O3 + Sm2SrAl2O7 composite thermal barrier coatings
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Date
2022
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Publisher
John Wiley and Sons Inc
Abstract
Rare earth-based samarium strontium aluminate (Sm<inf>2</inf>SrAl<inf>2</inf>O<inf>7</inf>) powder has been synthesized in the laboratory through molten salt synthesis and Al<inf>2</inf>O<inf>3</inf> + Sm<inf>2</inf>SrAl<inf>2</inf>O<inf>7</inf> (SSA) thermal barrier coatings have been developed on an Inconel 718 superalloy substrate by atmospheric plasma spraying technique. The microstructures and surface morphologies of the samples before and after the hot corrosion tests in 50 wt% Na<inf>2</inf>SO<inf>4</inf> + 50 wt% V<inf>2</inf>O<inf>5</inf> (aviation atmosphere) and 90 wt% Na<inf>2</inf>SO<inf>4</inf> + 5 wt% V<inf>2</inf>O<inf>5</inf> + 5 wt% NaCl (marine atmosphere) at 700°C and 900°C were examined. It is observed that samples exposed to marine conditions exhibited 14.5% and 11.6% lower lifetime than the samples exposed to aviation conditions at 700°C and 900°C, respectively, due to significant chlorides attack. © 2022 Wiley-VCH GmbH.
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Keywords
Alumina, Aluminum oxide, Atmospheric corrosion, Composite coatings, Corrosion resistant coatings, Corrosive effects, High temperature corrosion, Plasma spraying, Powder coatings, Rare earths, Sodium Aluminate, Sodium chloride, Sodium sulfate, Sprayed coatings, Strontium compounds, Vanadium pentoxide, Atmospheric plasma-spraying, Corrosion behaviour, Exposed to, Hot corrosion, Inconel 718 superalloys, Molten salts synthesis, Rare-earths, Samarium strontium aluminate, Superalloy substrates, Synthesised, Thermal barrier coatings
Citation
Materials and Corrosion, 2022, 73, 12, pp. 2004-2008