Abstract
Wetting of thermal barrier coatings (TBCs) with calcium-magnesium- alumino-silicate (CMAS) leads to sintering and phase transition, which are major issues in the aerospace industry. We prepared Sr(Zr1−2xYbxGdx)O3−x (x = 0, 0.05, 0.1, and 0.15) coatings using solution precursor plasma spraying with inter-pass boundaries (IPBs) and vertical cracks, and analyzed the CMAS wettability at 1350 °C using the sessile-drop method. The wetting and diffusion dynamics of the CMAS melt on the surface of the coating were studied using a CCD camera, revealing that the Sr(Zr0.7Yb0.15Gd0.15)O2.85 coating had the lowest spreading speed (2.60 × 10−4 mm/s, spreading balance process). Furthermore, a greater extent of crack bending and smaller crack diameter can prevent the coatings from penetration of the CMAS melt.
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