Y₂O₃ stabilized ZrO₂ (YSZ) thermal barrier coatings (TBCs) are prone to hot corrosion by molten salts. In this study, the microstructure of atmospheric plasma spraying YSZ TBCs is modified by laser glazing in order to improve the corrosion resistance. By optimizing the laser parameters, a ∼18 µm smooth glazed layer with some vertical cracks was produced on the coating surfaces. The as-sprayed and modified coatings were both exposed to hot corrosion tests at 700 and 1000 °C for 4 h in V₂O₅ molten salt, and the results revealed that the modified one had improved corrosion resistance. After hot corrosion, the glazed layer kept structural integrity, with little evidence of dissolution. However, the vertical cracks in the glazed layer acted as the paths for molten salt penetration, accelerating the corrosion of the non-modified coating. Further optimization of the glazed layer is needed in the future work.

中文翻译：

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Y 2 O 3稳定的ZrO 2热障涂层的激光玻璃修饰及其对耐热腐蚀性能的影响

Y ₂ O ₃稳定的ZrO ₂（YSZ）热障涂层（TBC）容易被熔融盐腐蚀。在这项研究中，大气等离子喷涂YSZ TBCs的微观结构通过激光玻璃修饰，以提高耐蚀性。通过优化激光参数，在涂层表面产生了约18 µm的光滑玻璃层，并带有一些垂直裂纹。喷涂后的涂层和改性涂层均在V ₂ O _5中于700和1000°C暴露于热腐蚀下4小时。结果表明，改性盐具有更好的耐腐蚀性。热腐蚀后，玻璃层保持结构完整性，几乎没有溶解迹象。但是，玻璃层中的垂直裂纹充当了熔融盐渗透的路径，从而加速了未改性涂层的腐蚀。在未来的工作中需要进一步优化玻璃层。