Abstract
Abstract The microstructure plays an important role in the durability and performance of the Thermal Barrier Coatings (TBCs). The TBCs were deposited on Ti-6Al-4 V substrate with NiCrAlY bond coat using APS and 8YSZ using in-house EB-PVD. The paper presents the effect of spray angle onto the microstructural and mechanical properties of 8YSZ in detail. The surface microstructural and elemental composition are examined using SEM with EDS. The coating porosity was examined by SEM and ImageJ using the grayscale threshold technique. Also, the mechanical properties like hardness, surface roughness, and thickness were measured by indentation, surface profilometer, and optical microscopy in combination with ImageJ. The results show 90° TBC with the uniform structure in the presence of a few pores and cracks compared to 60° TBC. In 60° TBC, the dissimilar grain growth and elongated grains with average size 300 nm compared to 90° TBC grain size 150 nm was observed. In 60° TBC, porosity with 20.65% more was present which contributes to large shadow region leading to high porosity. Also, the decrease in coating hardness with 5% was observed with an inclined spray angle. In 60° TBC, the rough and non-uniform surface was obtained, but the overall coating thickness was almost similar for both the spray angle condition.
Published Version
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