Molten salt corrosion behavior of laser remelted PS-PVD YSZ thermal barrier coatings

• DOI: 10.1016/j.jmrt.2024.04.006
• Publication Date: 2024-04-04T04:43:47Z
• Authors: Qijie Zhou; Jiao Wen; Yuqi Li; Jianmin Han; Bangyang Zhou; Hongbo Guo; Jiebo Li; Jian He
• Keywords: Physical vapor deposition

Molten salt from the service environment leaches Y2O3 yttria-stabilized zirconia (YSZ), threatening security of thermal barrier coatings (TBCs). In this study, we compared molten corrosion resistances YSZ prepared via plasma-spraying physical vapor deposition (PS-PVD) before and after laser remelting. At 1000 °C, reacted with particulates in PS-PVD coating infiltrated gaps between quasi-columnar crystals, resulting phase transition column breakage. A dense glazed layer was formed on surface remelting by low-energy-density laser, which prohibited penetration improved hot resistance coating. By contrast, failure high-energy-density laser-treated accelerated due to significant interfacial stress thick volume expansion caused products. Our investigation revealed structural evolution under conditions emphasizes role It can thus serve as a guideline for TBC modification.