研究了镍基铸造高温合金Ｍ３８及其含微量Ｙ的合金在１０００℃空气中的高温氧化行为，以及表面施加（Ｙ_２Ｏ_３－Ａｌ_２Ｏ_３）复合氧化物薄膜对上述的种合金氧化行为的影响．发现Ｍ３８，Ｍ３８＋（Ｙ_２Ｏ_３－Ａｌ_２Ｏ_３），Ｍ３８＋Ｙ＋（Ｙ_２Ｏ_３－Ａｌ_２Ｏ_３）的氧化动力学基本呈抛物线规律，而Ｍ３８＋Ｙ开始增重较快，而后趋于平缓，偏离抛物线规律．２００ｈ的氧化增重顺序为：Ｍ３８＞Ｍ３８＋（Ｙ_２Ｏ_３－Ａｌ_２Ｏ_３）＞Ｍ３８＋Ｙ＋（Ｙ_２Ｏ_３－Ａｌ_２Ｏ_３）＞Ｍ３８＋Ｙ．钇合金化及表面沉积（Ｙ_２Ｏ_３－Ａｌ_２Ｏ_３）复合氧化物薄膜显著地改变了Ｍ３８合金氧化物的表面形貌和组成，细化了氧化物晶粒，不同程度地促进了Ｃｒ和Ａｌ的选择氧化．
The effects of the multi-component (Y_2O_3-Al_2O_3) coating on the surface oxidation of the Ni-base cast superalloy M38 and Y microalloyed M38 (mass fraction of 0.04%) exposed to air at 1000℃ have been investigated. The oxidation kinetics of M38, M38+(Y_2O_3-Al_2O_3) and M38+Y+(Y_2O_3-Al_2O_3) follow the approximate parabolic law. The mass-gain of M38+Y is very rapid at the initial stage and slow after about 50 h. The sequence of mass-gains after 200 h oxidation is M38>M38+(Y_2O_3-Al_2O_3)>M38+Y+(Y_2O_3-Al_2O_3)> M38+Y. The morphology and component of the oxide scale on M38 are changed remarkably by the alloying of Y and the coating of (Y_2O_3-Al_2O_3) thin film. The grain size of oxide is fined and the selective oxidation of Cr and Al is promoted. Correspondent: HE Yedong,(professor, Corrosion and Protection Centre, University of Science and Technology Beijing, Beijing 100083)
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