PS-PVD热障涂层抗沙尘冲刷行为研究

Erosion Behavior of PS-PVD Thermal Barrier Coatings against Sand Dust

为提高PS-PVD热障涂层的抗沙尘冲刷性能,采用等离子喷涂-物理气相沉积技术(PS-PVD)在粘结层表面制备7YSZ热障涂层,在大气环境下进行了抗沙尘冲刷试验,研究了PS-PVD热障涂层的冲刷行为及失效机制。通过等离子喷涂技术(APS)在PS-PVD热障涂层表面制备了一层致密层状涂层,重点研究了致密层厚度对PSPVD热障涂层抗冲刷失效性能的影响。结果表明PS-PVD热障涂层冲刷过程经历了快速、中速、慢速冲刷三个阶段。随着致密层厚度的增加,对PS-PVD热障涂层抗冲刷性能的提升愈加明显。当致密层厚度为5μm时,对PS-PVD热障涂层抗冲刷性能无明显影响;当致密层厚度为10μm时,PS-PVD热障涂层抗冲刷性能提高了约30%;当致密层厚度为20μm时,PS-PVD热障涂层抗冲刷性能约提高了4倍。

In order to improve the particle erosion resistance of the PS-PVD thermal barrier coatings,7YSZ thermal barrier coating was prepared on the surface of the bond coat by plasma spray-physical vapor deposition(PS-PVD).The particle erosion test was carried in atmospheric environment and the erosion failure behavior of the PS-PVD thermal barrier coating was studied,the dense-layered coating was prepared on the surface of the PS-PVD thermal barrier coating by air plasma spraying(APS).The effect of dense-layered coating thickness on the erosion failure behavior of PS-PVD thermal barrier coating were studied.The results show that the particle erosion process of the PS-PVD thermal barrier coating has experienced three stages of fast speed,medium speed and slow speed erosion.As the thickness of the dense-layered increases,the improvement of the erosion resistance performance of the PS-PVD thermal barrier coatings becomes more significant.When the thickness of the denselayered coating is 5μm,the dense-layered has no obvious influence on the erosion failure behavior of the PSPVD thermal barrier coating;When the thickness of the dense-layered coating is 10μm,the erosion resistance performance of the PS-PVD thermal barrier coating is improved by about 30%;When the thickness of the denselayered coating is 20μm,the erosion resistance performance of the PS-PVD thermal barrier coating is increased by about 4 times.