论文部分内容阅读
分别采用大气等离子喷涂(APS)和等离子喷涂-物理气相沉积(PS-PVD)两种工艺方法制备YSZ(Y_2O_3稳定ZrO_2)热障涂层,同时在YSZ涂层表面沉积CMAS(CaO-MgO-Al_2O_3-SiO_2)混合盐,研究高温燃气持续加热下两种YSZ涂层的抗CMAS腐蚀行为。采用SEM、EDS、XRD等检测手段表征热障涂层腐蚀前后的微观结构、成分及物相变化。结果表明:APS-YSZ涂层在高温下经CMAS渗透后从基体整块剥落,涂层快速失效,而PS-PVD-YSZ涂层经高温燃气加热后同样被CMAS渗入,但并未发生明显涂层剥落,抗CMAS腐蚀剥落性能明显优于APS-YSZ涂层。分析表明CMAS混合盐对YSZ层的失效作用主要表现为热机械作用,其中APS-YSZ涂层应变容限较小,在涂层冷却过程中出现整块剥离现象,而PS-PVD-YSZ涂层应变容限较大,抗热震性好,涂层未出现整块剥离现象。
The YSZ (Y2O3 stabilized ZrO2) thermal barrier coatings were prepared by atmospheric plasma spraying (APS) and plasma spray-physical vapor deposition (PS-PVD) respectively. At the same time, the deposition of CMAS (CaO-MgO-Al 2 O 3 -SiO_2) mixed salt to study the anti-CMAS corrosion behavior of the two YSZ coatings under continuous heating with high temperature gas. The microstructure, composition and phase change of the thermal barrier coatings before and after thermal barrier coating were characterized by SEM, EDS and XRD. The results showed that the APS-YSZ coating peeled off from the whole matrix after infiltrated by CMAS at high temperature, and the coating rapidly failed. However, PS-PVD-YSZ coating infiltrated by CMAS after being heated by high temperature gas did not show obvious coating Peeling layer, anti-CMAS corrosion peel performance significantly better than the APS-YSZ coating. The results show that the failure mechanism of mixed salts of CMAS on YSZ layer is mainly thermomechanical, in which the strain tolerance of APS-YSZ coating is small, and the PSS-YSZ coating peels off during cooling. Large strain tolerance, good thermal shock resistance, the coating does not appear whole stripping phenomenon.