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根据YSZ在高温下是氧离子导体的电化学特性,对EB-PVD制备的双层结构YSZ/MCrAlY热障涂层试样进行外加直流电场作用下的高温氧化实验,利用SEM、EDS观察分析了外加电场条件下YSZ/MCrAlY界面热生长氧化物TGO结构形貌和成分。结果表明,在20V直流电场作用下经过1050℃,80h高温氧化后,与电源正极连接一侧热障涂层试样表面平整,TGO致密,与YSZ结合较好,而与电源负极连接一侧的涂层出现鼓起失效,涂层产生严重内氧化。外电场控制氧离子从YSZ表面向YSZ/MCrAlY界面扩散,改变YSZ/MCrAlY界面氧分压和氧空位浓度,对热障涂层高温氧化行为和失效产生影响。
According to the electrochemical characteristics of YSZ at high temperature, the high-temperature oxidation test of YSZ / MCrAlY double-layer thermal barrier coatings prepared by EB-PVD was carried out under the action of applied DC electric field. SEM and EDS Structure Morphology and Composition of Thermal Growth Oxide TGO at YSZ / MCrAlY Interface under Electric Field. The results show that the surface of the thermal barrier coating on the side connected with the positive electrode of the power supply after the high temperature oxidation at 1050 ℃ and 80h under the direct current of 20V has a smooth surface with dense TGO and a good combination with YSZ, Coating appears bulging failure, the coating has serious internal oxidation. The external electric field controls the diffusion of oxygen ions from the YSZ surface to the YSZ / MCrAlY interface and changes the oxygen partial pressure and the oxygen vacancy concentration at the YSZ / MCrAlY interface, which affect the high temperature oxidation behavior and failure of the thermal barrier coating.