Abstract The pore filling behavior in yttria-stabilized zirconia air plasma sprayed (APS) thermal barrier coatings (TBCs) during calcium-magnesium-alumino-silicate (CMAS) infiltration process was investigated. After fully infiltration, the total porosity of the coating decreased. However, the total porosity of the top region increased due to severe microstructural change. For the bottom region, whose microstructure did not change significantly, its total porosity dropped and almost all crack network disappeared, but 48 vol. % of globular pores still existed and larger globular pores were more likely to remain. This study indicates that introducing relatively large globular pores into APS TBCs may mitigate CMAS damage.

中文翻译：

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CMAS攻击下空气等离子喷涂热障涂层的孔隙填充行为

摘要 研究了氧化钇稳定氧化锆空气等离子喷涂（APS）热障涂层（TBCs）在钙镁铝硅酸盐（CMAS）渗透过程中的孔隙填充行为。完全渗透后，涂层的总孔隙率下降。然而，由于严重的微观结构变化，顶部区域的总孔隙率增加。对于微观结构没有显着变化的底部区域，其总孔隙率下降，几乎所有裂纹网络消失，但 48 vol. ％的球状孔仍然存在，较大的球状孔更有可能保留。该研究表明，在 APS TBC 中引入相对较大的球状孔可以减轻 CMAS 的损伤。