在空气条件下对电子束物理气相沉积制备的Ni-19.3Cr-20Fe-0.8Al高温合金箔于800 ℃和900 ℃恒温氧化100 h, 通过扫描电子显微镜及附带的能谱仪、X射线衍射仪对氧化后试样的物相组成及氧化行为进行了研究。结果表明: 合金箔在800 ℃恒温氧化的动力学曲线遵守三次方规律, 100 h的平均氧化速率为1.7×10-10 g·m-2·h-1, 氧化膜的外层为致密的Cr2O3, 内层为准连续的Al2O3; 在900 ℃恒温氧化的动力学曲线遵守抛物线规律, 100 h平均氧化速率为5.2×10-10g·m-2·h-1, 氧化膜由致密的Cr2O3组成, 内部伴有少量的内氧化物Al2O3。

The superalloy foil Ni-19.3Cr-20Fe-0.8Al prepared by electron beam physical vapor deposition was oxidized at 800 ℃and 900 ℃ for 100 h in air, respectively. And the phase composition and the oxidation behaviors were investigated using scanning electron microscopy with energy dispersive spectrometer, X-ray diffraction. The results show that the oxidation kinetics curve of the alloy foil followed a cubic power law at 800 ℃ for 100 hours in air, and the average oxidation rate was 1.7×10-10 g·m-2·h-1. The oxide scale after 800 ℃ oxidation for 100 hours consisted of double layers, a compact Cr2O3 oxide of outer layer and a quasi-continuous Al2O3 oxide of inner layer. The oxidation kinetics curve of the alloy foil followed a parabolic law at 900 ℃ for 100 hours in air, and the average oxidation rate was 5.2×10-10 g·m-2·h-1. The oxide scale after 900 ℃ oxidation for 100 hours consisted of a dense Cr2O3 oxide layer with some internal oxide Al2O3.