利用X射线衍射仪（XRD）、扫描电镜（SEM）和能谱仪（EDS）等,对800H合金高温氧化膜的增厚动力学、形貌及氧化物组成进行了分析。结果表明,700和800℃下形成的氧化膜相近,由（Cr,Fe）2O3和Mn-Cr氧化物组成;900℃时的氧化膜急剧增厚,里层依然是Cr2O3,中间层则是Cr-Fe-Mn氧化物,外层为富Ti的氧化物。通过热力学和动力学计算,提出了800H合金氧化膜形成的模型,发现TiN的存在改变了氧化膜的结构。
Oxidation kinetics, morphology and constitution of oxides formed on alloy 800 H at high temperature were analyzed by means of X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The results show that the scales formed at 700 ℃ are similar to that formed at 800 ℃ , mainly composed of （Cr,Fe）2O3 and Mn-Cr oxides. The scales formed at 900 ℃ are much thicker with three layers ： an inner layer of Cr2O3 , an interlayer of Cr-Fe-Mn oxides and an outer layer of Ti-riched oxides. The oxidation of 800H alloy is simulated by thermodynamics and kinetics calculation, and TiN particles are considered to change the scales structure.
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