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研究了熔模铸造钴基高温合金22Co-21Ni-29Cr-2.2Nb-Fe在1 050、1 150和1 250℃下的恒温氧化行为,并采用X射线衍射仪、扫描电镜及能谱仪分析了合金氧化层形貌及成分。结果表明,Co22合金在1 050~1 250℃下的氧化增重遵守二次抛物线规律,且随着温度的升高而增大;合金在氧化后形成了连续的氧化层,其中内层为Cr2O3氧化膜,外层由(Fe,Ni,Co,Cr)3O4尖晶石和少量的CrNbO4构成。合金氧化层的生长可分为3个阶段,第1阶段氧化层为Cr2O3氧化膜,第2阶段氧化层由内Cr2O3层与离散分布在外表面的Fe,Ni,Co和Nb的氧化物组成,且在氧化层的外表面出现了沿基体晶界分布的岛状氧化物区,第3阶段形成了外(Fe、Ni、Co、Cr)3O4尖晶石-内Cr2O3的双层氧化层结构并伴有少量的CrNbO4离散分布于外表面。
The oxidation behavior of 22Co-21Ni-29Cr-2.2Nb-Fe cobalt alloy superalloy at 1050,1 150 and 1 250 ℃ was investigated. The results of X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy Alloy oxide morphology and composition. The results show that the oxidation weight gain of Co22 alloy obeys the quadratic parabola law at 1050 ~ 1 250 ℃ and increases with the increase of temperature. The oxide forms a continuous oxide layer with an inner layer of Cr2O3 Oxide film, the outer layer (Fe, Ni, Co, Cr) 3O4 spinel and a small amount of CrNbO4 composition. The growth of the alloy oxide layer can be divided into three stages. The first stage oxide layer is a Cr2O3 oxide film, the second stage oxide layer is composed of an inner Cr2O3 layer and oxides of Fe, Ni, Co and Nb dispersedly distributed on the outer surface, and In the outer surface of the oxide layer, an island-shaped oxide region is formed along the grain boundaries of the substrate. In the third stage, a double oxide layer structure of the (Fe, Ni, Co, Cr) 3O4 spinel- A small amount of CrNbO4 dispersed on the outer surface.