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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 ,Y2 O3 及离子注入Y+ 对Fe 2 3Cr 5Al合金 110 0℃恒温氧化行为的影响。不含Y的Fe2 3Cr5Al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× 10 1 7Y+ /cm2 后氧化膜粘附性得到了改善。合金中加入弥散的Y或Y2 O3 改变了氧化膜形貌 ,膜平坦致密 ,不开裂剥落。不含Y的Fe2 3Cr5Al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Al2 O3 膜粘附性的原因还在于改变了Al2 O3 膜的生长机制。
The effects of dispersed Y, Y2O3 and ion-implanted Y + on the isothermal oxidation behavior at 110 ℃ of Fe 2 3Cr 5Al alloy were investigated by means of TG, SEM and EDS. Y2-free Fe2 3Cr5Al alloy film wrinkles, after prolonged oxidation, the film cracks during the cooling process. Oxide film adhesion was improved after the alloy ions were implanted at 1 × 10 17 Y + / cm 2. Addition of dispersed Y or Y2 O3 alloy changed the oxide film morphology, the film is flat and dense, no cracking spalling. The formation of wrinkle topography of Fe2Cr5Al alloy oxide film without Y and the reason of flaking of the film are related to the growth mechanism of oxide film and the segregation of S in the alloy, and the reason for Y to improve the adhesion of the oxide film of Fe Cr Al alloy is mainly It is easy for Y to form a stable sulfide with S, thereby preventing S from segregating at the film / alloy interface. The reason why Y improves the adhesion of Al 2 O 3 film also lies in changing the growth mechanism of Al 2 O 3 film.