研究了不同铝含量的Fe-25Cr-20Ni在900℃、1000℃和1100℃的高温氧化行为.其中,Fe-25Cr-20Ni-4.72A1在900℃、1 000℃和1 100℃时的平均氧化速度比Fe-25Cr-20Ni分别降低47.14%、58.14%和17.49%.X射线衍射分析结果表明,氧化膜主要为Fe、Cr的氧化物和尖晶石(NiCr2O4、FeCrzO4),其中在Fe-25Cr-20Ni-4.72A1合金中检测到了A12O3.对氧化后试样截面进行扫描电镜观察和能谱分析,结果表明,不含铝以及铝的质量分数为1.68%和7.10%的试样氧化后氧化膜分为两层:即厚度较为均匀,存在较多的破碎、剥落的外层和外层与基体之间的较为致密,但存在空穴的内层;铝的质量分数为4.72%的试样氧化膜较为致密,基本无剥落,分层现象不明显,生成的AlzOa存在于氧化膜的最外层,有效防止了材料的进一步氧化.
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