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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。
The thickening kinetics, morphology and oxide composition of high temperature oxidation film of 800H alloy were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) The results show that the oxide films formed at 700 and 800 ℃ are similar to each other and consist of (Cr, Fe) 2O3 and Mn-Cr oxides. At 900 ℃, the oxide film thickens sharply. The inner layer is still Cr2O3 and the middle layer is Cr -Fe-Mn oxide and the outer layer is Ti-rich oxide. Based on the thermodynamic and kinetic calculations, a model of the formation of 800H alloy oxide film was proposed. It was found that the presence of TiN changed the structure of the oxide film.