EB-PVD制备YSZ涂层的热震性研究

Research on Thermal Shock Performance of YSZ Coatings Deposited by EB-PVD

用电子束蒸发镀膜的技术制备一系列不同微观结构的YSZ涂层,通过对涂层进行热震实验,测试50次热循环,通过SEM、XRD对涂层样品微观结构进行表征。通过实验和表征结果发现制备束流在350mA的情况下YSZ涂层样品的热震性能最好。对涂层失效机理进行讨论得出,涂层表面过于致密阻碍热应力的缓解,表面过于疏松加速氧气的渗入,加速TGO的生长导致涂层剥落失效。

A series of YSZ coatings were deposited by electron beam evaporation coating.The thermal shock test of the coatings was used to test the peeling of different process coatings under the same thermal shock times.It was found that the thermal shock performance of the coating was best at 350 mA.Discussion on the failure mechanism of the coating shows that the dense coating structure hinders the alleviation of thermal stress,the loose coating structure accelerates the infiltration of oxygen,and accelerates the growth of TGO,which results in the failure of coating.