Comparison of CMAS Corrosion Resistance of Different Structure Thermal Barrier Coatings Prepared by Atmospheric Plasma Spraying

Dense vertical cracks thermal barrier coating（DVC TBC） and embedded micro-agglomerated particle thermal barrier coating（EMAP TBC） were prepared by atmospheric plasma spraying（APS）. The penetration behavior of molten calcium-magnesium-alumina-silicates（CMAS） at 1300 ℃ and the thermal shock performance at 1100 ℃ were compared between the two coatings. The results show that the EMAP TBC has a loose porous structure, and the penetration area of CMAS is uniform and obvious; the structure of DVC TBC is dense and vertical cracks exist, and the penetration of CMAS is uneven. In the dense area, the concentration of CMAS is less than that of EMAP coating, but the vertical crack makes CMAS penetrate deeper than that of EMAP coating. In addition, the thermal shock performance of EMAP TBC is better than that of DVC TBC. The results provide a basis for improving the microstructure and CMAS corrosion resistance of thermal barrier coatings in the future.