采用喷雾干燥法制备了等离子喷涂-物理气相沉积(PS-PVD)用纳米CeO2-Y2O3-ZrO2(CYSZ)粉末,然后在四个不同的温度下进行煅烧处理(600°C,700°C,800°C,900°C)。物理性质,微观结构,使用激光粒度分析仪研究了煅烧粉末的相组成,扫描电子显微镜(SEM),和X射线衍射(XRD)。结果表明,与通过喷雾干燥获得的团聚粉末相比,团聚粉末的粒径随煅烧温度的升高而变化,伴随着团聚粉末颗粒的自结合力的增加。适当的煅烧温度改善了粉末的可喷涂性。此外,随着煅烧温度的升高,粉末中发生了从m相到t相的转变,Ce4+部分进入Zr晶格形成t-Zr0.84Ce0.16O2相,这促进了m相的抑制并提高了高温相稳定性。还发现,使用上述粉末制备的PS-PVD涂层随着粉末煅烧温度的升高而表现出更粗的柱状结构。
Self-made agglomerated nanometer CeO2-Y2O3-ZrO2 (CYSZ) powders for plasma spray-physical vapor deposition (PS-PVD) were prepared by spray-drying, followed by calcination treatment at four different temperatures (600 °C, 700 °C, 800 °C, 900 °C). The physical properties, microstructure, and phase composition of the calcined powders were investigated using a laser particle size analyzer, scanning electron microscopy (SEM), and X-ray diffraction (XRD). The results showed that compared to the agglomerated powders obtained through spray-drying, the particle size of the agglomerated powders changed with increasing calcination temperature, accompanied by an increase in the self-bonding force of the agglomerated powder particles. The proper calcination temperature improved the sprayability of the powders. Additionally, with the increase in the calcination temperature, a transformation from the m-phase to the t-phase occurred in the powder, with Ce4+ partially entering the Zr lattice to form the t-Zr0.84Ce0.16O2 phase, which facilitated the suppression of the m-phase and improved the high-temperature phase stability. It was also found that the PS-PVD coatings prepared using the aforementioned powders exhibited coarser columnar structures with increasing powder calcination temperature.