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采用扫描电子显微镜和X射线衍射分析仪研究了1100℃下Ni-22Cr-20Co-18W合金氧化膜的演变规律。结果显示,在氧化初始阶段,表面形成了Cr2O3,NiO和(Co,Ni,Mn,Cr)3O4混合氧化膜,后者为M3O4型氧化物。长时间氧化后,氧化膜由单层转变为双层,在内层形成连续的Cr2O3膜,在外层形成可以抑制内层Cr2O3挥发的致密NiO氧化膜;同时氧化空位在氧化膜与合金基体界面处形成,并且Al元素的内氧化也在该处发生。
The evolution of the oxide film of Ni-22Cr-20Co-18W alloy at 1100 ℃ was investigated by scanning electron microscopy and X-ray diffraction analyzer. The results show that at the initial stage of oxidation, mixed oxides of Cr2O3, NiO and (Co, Ni, Mn, Cr) 3O4 are formed on the surface, and the latter is M3O4 type oxide. After oxidation for a long time, the oxide film changes from single layer to double layer, forming continuous Cr2O3 film in the inner layer and dense NiO oxide film in the outer layer to suppress the volatilization of Cr2O3 in the inner layer. Meanwhile, the oxidized vacancies are formed at the interface between the oxide film and the alloy substrate Is formed, and internal oxidation of Al element also occurs there.