High-temperature oxidation behavior of plasma-sprayed NiCrAlY/TiO2 and NiCrAlY/Cr2O3/YSZ coatings on titanium alloy
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
Springer Science and Business Media Deutschland GmbH
Abstract
The 70% NiCrAlY + 30% TiO<inf>2</inf> and 70% NiCrAlY + 25% Cr<inf>2</inf>O<inf>3</inf> + 5% YSZ metallic coatings are sprayed on titanium-15 alloy of ASTM B338, Grade 2, by using the plasma spray coating technology. Cyclic oxidation studies are conducted on the uncoated and coated alloys at 700 °C under static air environment. The kinetics of oxidation is studied by using the thermo-gravimetric method. Phase, microstructural, and chemical analysis tests are performed on as-sprayed and oxidized coatings. The coated alloys are found to be more resistant when compared to the uncoated alloys. The NiCrAlY + Cr<inf>2</inf>O<inf>3</inf> + YSZ coating is found to be more protective when compared to NiCrAlY + TiO<inf>2</inf> coating. It is concluded that the formation of Cr<inf>2</inf>O<inf>3</inf>, NiCr<inf>2</inf>O<inf>4</inf>, and Al<inf>2</inf>O<inf>3</inf> is attributed to the development of oxidation resistance in the coatings. © 2022, International Institute of Welding.
Description
Keywords
Alumina, Aluminum oxide, Chemical analysis, Oxidation resistance, Plasma jets, Plasma spraying, Sprayed coatings, Thermooxidation, Titanium alloys, Yttria stabilized zirconia, Coating technologies, Cyclic oxidation, High temperature oxidation Behavior, Metallic coating, NiCrAlY/cr2O3/YSZ, NiCrAlY/TiO2, Plasma spray coating, Titania, Titanium (alloys), YSZ coatings, Titanium dioxide
Citation
Welding in the World, 2022, 66, 6, pp. 1069-1079