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测定了一种35Ni-15Cr型铁基高温合金750—1000℃的氧化动力学曲线,并计算出氧化激活能Q_(p1)=41kcal/g-mol,Q_(p2)=46kcal/g-mol.X射线结构分析表明,氧化膜主要由Cr_2O_3构成,并含有(Cr,Fe)_2O_3,TiO_2及NiCr_2O_4。电子探针分析表明,氧化膜富Cr,Fe,Ti。铬离子在Cr_2O_3中的扩散是这种合金抛物线氧化过程的主要控制机构。渗铝防护后,氧化膜富Al,Cr,Ti.主要由a-Al_2O_3构成,并含有TiO_2和Fe(Cr,Al)_2O_4。这种致密而牢固的氧化膜使抗氧化和抗热腐蚀性能大为改善。
The oxidation kinetics curve of a 35Ni-15Cr iron-based superalloy at 750-1000 ℃ was measured. The oxidation activation energy Q p1 = 41 kcal / g-mol and Q p2 46 kcal / g-mol were calculated. X-ray structure analysis shows that the oxide film mainly consists of Cr 2 O 3 and contains (Cr, Fe) 2 O 3, TiO 2 and NiCr 2 O 4. Electron probe analysis showed that the oxide film is rich in Cr, Fe, Ti. The diffusion of chromium ions in Cr_2O_3 is the main control mechanism for the parabolic oxidation of this alloy. After the aluminizing protection, the oxide film is rich in Al, Cr and Ti, and is mainly composed of a-Al 2 O 3 and contains TiO 2 and Fe (Cr, Al) 2 O 4. This dense and strong oxide film greatly improves the oxidation resistance and hot corrosion resistance.