利用热重分析法及x射线衍射（XRD）、扫描电镜（SEM／EDX）等手段，研究一种镍基高温合金在850℃和950℃的高温氧化行为．结果表明，氧化动力学曲线遵循抛物线规律，随着氧化时间的延长，氧化增重变得缓慢．在850℃和950℃时氧化膜由三层组成，外层为复杂氧化物和尖晶石化合物等，中间过渡层和内氧化层均为Al2O3氧化过程中，外层中形成的富Ta相抑制基体合金中Al向外扩散，形成了平直连续Al2O3的中间层，使氧化速度减慢，进而抑制氧化膜生长，降低氧化速率．
The high temperature oxidation behavior of a new nickel-based superalloy was investigated at 850℃ and 950 ℃ in air by means of TGA, XRD and SEM/EDX. The results show that oxidation kinetics basically obeys parabolic law. The formed oxide scale is consisted of three layers at 850 ℃ and 950℃.The outer layer is mainly composed of complex oxides and spinals, and the middle one is a continuous layer and finally the inner one is a dis-continuous layer of Al2O3. The out layer is rich in Ta, which may suppress the diffusion rate of AI. As a result, a continuous oxide layer of Al2O3 is formed in the middle of the scale to restrain the growth of oxide scale and decrease the oxidation rate.
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