Abstract
Plasma-sprayed (PS) coatings in industrial or aerospace applications are chosen as a technique for enhancing the high-temperature oxidation performance of parts operating under strenuous conditions. However, the presence of microstructural defects and amorphous phases developed in as-sprayed plasma coatings can restrict the potential of such coatings when exposed to thermal cycling conditions. Examining the oxidation performance and microstructural characterization of three heat-treated Inconel 625-Al2O3 plasma-sprayed composite coatings over an ASTM SA210 GrA1 (uncoated) substrate is the goal of the current study: The three prepared compositions are; a) Inconel625-30 wt% micron-sized Al2O3 (INC625-CHT) coating, b) Inconel625-30 wt% nano-sized Al2O3 (INC625-NHT) coating and c) Inconel625-15 wt% micron-sized Al2O3 + 15 wt% nano-sized Al2O3 (INC625-BHT/bimodal) coating. High-temperature oxidation tests were conducted at 900 °C temperature in air for 50 cycles in a simulated environment using a laboratory silica tube furnace. The microstructures and morphologies of the composite coatings in the as-sprayed and oxidized conditions were characterized using SEM, EDX, and XRD techniques. The furnace heat treatment (HT) improves the oxidation resistance of the coatings in order INC625-BHT, INC625-NHT, and INC625-CHT coating by healing interlamellar defects like pores and cracks.
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