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采用电子束、原子束、离子束技术在基体上沉积NiCoCrAlY-ZrO_2·Y_2O_3热障复合涂层,对其进行了1100℃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。
The NiCoCrAlY-ZrO_2 · Y_2O_3 thermal barrier composite coatings were deposited on the substrate by electron beam, atomic beam and ion beam techniques. The isothermal oxidation tests were carried out at 1100 ℃ for different time. The coatings were characterized by scanning electron microscopy and X-ray diffractometry Observation and analysis. The results show that the oxidation behavior of the coating basically follows the parabolic law. With the increase of the oxidation time, the thickness of the ceramic coating gradually decreases. The enrichment of chromium oxide on the surface occurs. The effect of chromium oxide containing yttrium on the anti-oxidation of the coating has been greatly enhanced. The brittle oxides such as nickel and cobalt spall off at the same time, leading to the depletion of the aluminum oxide. After 300 h of oxidation, The alloy layer still has a good combination.