论文部分内容阅读
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 oxidation behavior of Ni-based superalloy M38 and its alloy Y containing trace amounts of Y at 1000 ℃ in air and the effects of surface-applied (Y_2O_3-Al_2O_3) composite oxide films on the above-mentioned alloying behavior were investigated. It was found that the oxidation kinetics of M38, M38 + (Y_2O_3-Al_2O_3) and M38 + Y + (Y_2O_3-Al_2O_3) showed a parabolic law basically, while M38 + Y started to gain weight rapidly and then became flat, deviating from the law of parabola. The order of oxidation and weight gain of 200h was M38> M38 + (Y_2O_3-Al_2O_3)> M38 + Y + (Y_2O_3-Al_2O_3)> M38 + Y. Yttrium alloyed and surface-deposited (Y_2O_3-Al_2O_3) composite oxide thin films significantly changed the surface morphology and composition of M38 alloy oxides, refined the oxide grains, and promoted the selective oxidation of Cr and Al to varying degrees.