摘要
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、弥散分布的Y2 O3及离子注入Y+对Fe 2 3Cr 5Al合金 1 1 0 0℃循环氧化行为的影响。不含Y的合金经 1 0 0h循环氧化后氧化膜发生了开裂和剥落 ,露出合金基体 ;加入弥散的Y或Y2 O3的合金经 1 0 0h循环氧化后氧化膜平坦致密 ,不剥落 ;离子注入 1× 1 0 17Y+/cm2 后合金氧化膜主要发生层间剥落。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 1100 ℃ cyclic oxidation behavior of Fe 23Cr 5Al alloy modified by yttrium was studied. Yttrium was added to this alloy in the form of (1) metallic addition; (2) yttrium oxide dispersion; (3) ion implant. Cracking and spalling occurred on the convoluted scale formed on the Y free alloy and exposed the substrate. A flat dense scale without spallation was formed on the yttrium or yttrium oxide dispersion alloy. Spallation mainly occurred between the two layers of the scale on the 1×10 17 Y +/cm 2 implanted alloy. The results indicate that the main reason why the adhesion of alumina scale is improved by yttrium addition lies in: Yttrium is liable to form a stable yttrium sulfide with sulfur in the alloy and prevents sulfur interface segregation. Another reason is that the growth mechanism of alumina scale is changed by yttrium addition.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2000年第3期239-242,共4页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金!"八五"重点项目 ( 592 31 0 1 0 )
