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采用静态增重法测定了中频感应炉熔炼、金属型冷却制备的Fe3Al合金在700、850、1000℃的高温氧化行为,700、850℃时合金的氧化动力学曲线基本符合抛物线规律,1000℃的则不符合;合金在氧化过程中表现为完全抗氧化级。X射线衍射、扫描电镜和能谱分析表明,700℃×125h的氧化膜主要由FeAl2O4、Cr2O3和少量的Al2O3组成;850、1000℃时氧化膜分为两层,内层主要由FeAl2O4和Fe2O3组成,表层为Al2O3,在实验时间内Al2O3氧化膜没有完全覆盖内层氧化膜;随着氧化温度的升高,氧化时间的延长,合金表层的Al2O3氧化膜将由θ-Al2O3向α-Al2O3转变。
Static oxidation was used to measure the oxidation behavior of Fe3Al alloy prepared by medium frequency induction furnace melting and metal cooling at 700, 850 and 1000 ℃. The oxidation kinetics curve of the alloy at 700 and 850 ℃ basically met the parabolic law, It does not meet; alloy in the oxidation process showed complete antioxidant level. X-ray diffraction, scanning electron microscopy and energy spectrum analysis show that the oxide film at 700 ℃ × 125h mainly consists of FeAl2O4, Cr2O3 and a small amount of Al2O3; 850,1000 ℃ the oxide film is divided into two layers, the inner layer is mainly composed of FeAl2O4 and Fe2O3 , The surface layer of Al2O3, Al2O3 oxide film does not completely cover the inner oxide film during the experimental time; With the oxidation temperature increases, the oxidation time, the surface of the alloy Al2O3 oxide film from α-Al2O3 to α-Al2O3 transformation.