钇对Fe-Cr-Al合金循环氧化行为的影响  

Influences of Yttrium on Cyclic Oxidation Behavior of Fe-Cr-Al Alloy

作　　者：辛丽[1] 李美栓[1] 钱余海[1] 李铁藩[1] 王福会[1] 

机构地区：[1]中国科学院金属腐蚀与防护研究所

出　　处：《中国稀土学报》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 )

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.

关 键 词：稀土 钇 循环氧化 铁铬铝合金 防腐 粘附性 

分 类 号：TG174.451[金属学及工艺—金属表面处理] O614.322[金属学及工艺—金属学]