利用热重分析、扫描电镜及能谱分析等手段研究了合金中弥散分布的Y, Y2O3及离子注入Y+对Fe-23Cr-5Al合金1100 ℃恒温氧化行为的影响. 不含Y的Fe23Cr5Al合金氧化膜起皱, 长时间氧化后冷却过程中膜发生开裂剥落. 合金离子注入1×1017Y+/cm2后氧化膜粘附性得到了改善. 合金中加入弥散的Y或Y2O3改变了氧化膜形貌, 膜平坦致密, 不开裂剥落. 不含Y的Fe23Cr5Al合金氧化膜皱褶形貌的形成及膜发生剥落的原因与氧化膜生长机制及合金中S的界面偏聚有关, Y提高Fe-Cr-Al合金氧化膜粘附性的原因主要在于Y易与S形成稳定的硫化物, 从而阻止了S在膜/合金界面偏聚. Y提高Al2O3膜粘附性的原因还在于改变了Al2O3膜的生长机制.
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