采用电子束、原子束、离子束技术在基体上沉积NiCoCrAlY-ZrO2·Y2O3热障复合涂层,对其进行了1 100 ℃不同时间的等温氧化试验,用扫描电镜和X射线衍射仪对涂层进行观察和分析.结果表明：涂层的氧化行为基本遵循抛物线规律:随着氧化时间的增加,表面陶瓷层厚度逐渐减少:表面发生铬氧化物的富集,同时由于表面钇的偏聚对表面铬氧化物起钉扎作用,从而使含钇的铬氧化物在涂层的抗氧化中起了主要贡献:镍、钴等脆性氧化物发生剥落的同时,导致了铝氧化物的耗损:300 h氧化后陶瓷层与合金层仍具有良好的结合.

NiCoCrAlY-ZrO2·Y2O3 coatings were deposited by the technology combining electron,atom and ion beams ( three beams).Isothermal oxidation was performed at 1 100 ℃ for 50 h,150 h and 300 h respectively.SEM with EDAX,as well as XRD were used to characterize the coatings.The results show that the oxidation behavoirs of the NiCoCrAlY-ZrO2·Y2O3 coatings obey the law of parabola.After oxidation at 1 100 ℃ the thickness of the ceramic layer became smaller,enrichment of chromium oxides form on the surface,and segregation of Y occurr at the surface due to its extra-diffusion with increasing oxidation time.The pinning of Y stabilize the chromium oxides at high temperature.Y play the main role in the oxidation resistance of the NiCoCrAlY-ZrO2·Y2O3 coatings.The brittle nickel and cobalt oxides on the surface spall and led to the depletion of aluminium oxides with the increase of time.The cross-section morphology of the coatings after oxidation 300 h show that good bonds between ceramic and alloy layers could be obtained for the coatings prepared with the technology of three beams.