Abstract
The spreading behavior of CMAS melt on cubic crystalline YSZ with low index orientation is studied by observing the variation of contact angles of CMAS melt on YSZ surface and the microstructure change caused by thermal chemical corrosion. In this study, the empirical formula of CMAS spreading on YSZ is established based on the experimental results. Whether in the vacuum or in the air, the tendency of the equilibrium contact angle of molten CMAS on the surface of single crystalline cubic YSZ is 〈1 0 0〉 > 〈1 1 1〉 > 〈1 1 0〉, and the spreading speed increases as 〈1 0 0〉 < 〈1 1 0〉 < 〈1 1 1〉. However, the specific spreading behavior of sectional samples varies with the atmosphere. Compared to the air environment, YSZ 〈1 0 0〉 obviously shows faster spreading speed and smaller equilibrium contact angle than in the vacuum. In this spreading process, the microstructures of invert trapezoid formed at the interface between CMAS and YSZ 〈1 0 0〉 and the semicircle (or the rounded triangle) formed on YSZ 〈1 1 0〉 and 〈1 1 1〉 play more important role than the surface energy which is calculated by first-principles.
Published Version
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