Atypical decomposition processes of Sm2Zr2O7 + 8YSZ dual-phase TBCs during hot corrosion
作者： Grzegorz Moskal , Sebastian Jucha , Marta Mikuśkiewicz , Damian Migas , Anna Jasik
DOI: 10.1016/J.CORSCI.2020.108681
关键词: Decomposition 、 Chemical process of decomposition 、 Eutectic system 、 Superalloy 、 Sodium sulfate 、 Thermal barrier coating 、 Chemical engineering 、 Materials science 、 Thermal decomposition 、 Corrosion 、 General Materials Science 、 General chemistry 、 General Chemical Engineering
摘要: Abstract The accelerated decomposition of an Sm2Zr2O7+8YSZ system in the form air plasma spraying (APS) thermal barrier coatings composites, double ceramic layer (DCL), and functional graded (FGS) types under hot corrosion conditions were analyzed. Hot tests performed using liquid sodium sulfate salt deposits then X-Ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersion spectroscopy (EDS) to identify reaction products. obtained data indicated that negligible amounts sulfates or oxysulfates formed, but significant pyrochlore Sm2Zr2O7 fluorite phase was detected. These phenomena also observed a much higher temperature range during pure oxidation tests, lowest (920 °C) assisted process. described observations confirmed similar realized model powder mixtures. Microstructural analysis (TBC) cross-sections revealed complex process localized areas near splats. mainly related interactions between 8YSZ accordance with fluxing mechanism typical for Ni-based superalloys. Additionally, effect eutectic Na-Sm-O determined.
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