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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Al_2O_3.氧化过程中,外层中形成的富Ia相抑制基体合金中Al向外扩散,形成了平直连续Al_2O_3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.
Thermogravimetric analysis, X-ray diffraction (XRD) and scanning electron microscopy (SEM / EDX) were used to investigate the oxidation behavior of a Ni-based superalloy at 850 ℃ and 950 ℃ .The results showed that the oxidation kinetics follow the parabola Law, with the oxidation time, oxidation weight gain becomes slow.At 850 ℃ and 950 ℃, the oxide film consists of three layers, the outer layer of complex oxides and spinel compounds, the intermediate transition layer and the inner oxide layer Are Al 2 O 3 during the oxidation process, the outer layer formed in the rich Ia phase inhibition matrix alloy Al outward diffusion to form a straight continuous Al_2O_3 intermediate layer, the oxidation rate slowed down, thereby inhibiting the growth of oxide film, reducing the oxidation rate .