The yttria-stabilized zirconia (YSZ) ceramic has been proved to be a promising material for abradable seal coatings. In this research, abradable seal coatings named C-YSZ and M-YSZ were prepared by applying the conventional plasma spraying method with improved nanostructured powders and by the mixed solution precursor plasma spraying technique, respectively. A study on the microstructure, mechanical properties, oxidation resistance and hot corrosion resistance was conducted on both C-YSZ and M-YSZ coatings by using scanning electron microscopy, transmission electron microscopy, muffle furnace and x-ray diffractometer. The results show that the C-YSZ coating presents larger-size pores with denser YSZ structures and grains showing size larger than 100 nm distributed around the pores compared with M-YSZ, in which the pores are much smaller and the grain size is 20-30 nm. As a result, the M-YSZ coating displays lower hardness and bond strength compared with C-YSZ. The oxidation tests show that the M-YSZ coating possesses better oxidation resistance due to the nanostructure topcoat compared with C-YSZ. However, the hot corrosion tests indicate that both the C-YSZ coating and the M-YSZ coating fail to present ideal hot corrosion resistance.

氧化钇稳定的氧化锆（YSZ）陶瓷已被证明是用于耐磨密封涂层的有前途的材料。在这项研究中，分别通过使用具有改进的纳米结构粉末的常规等离子喷涂方法和混合溶液前驱体等离子喷涂技术分别制备了名为C-YSZ和M-YSZ的耐磨密封涂层。利用扫描电子显微镜，透射电子显微镜，马弗炉和X射线衍射仪对C-YSZ和M-YSZ涂层进行了显微组织，力学性能，抗氧化性和抗热腐蚀性能的研究。结果表明，与M-YSZ相比，C-YSZ涂层具有较大的孔，具有更密实的YSZ结构，并且晶粒尺寸大于100 nm分布在孔周围。其中孔小得多，晶粒尺寸为20-30 nm。结果，与C-YSZ相比，M-YSZ涂层显示出较低的硬度和粘结强度。氧化测试表明，与C-YSZ相比，由于纳米结构面涂层，M-YSZ涂层具有更好的抗氧化性。然而，热腐蚀测试表明，C-YSZ涂层和M-YSZ涂层均不能表现出理想的抗热腐蚀性能。