摘要
对纯镍及其表面离子注钇试样在1000℃空气中的恒温氧化和循环氧化行为进行了研究。用扫描电镜(SEM)和透射电镜(TEM)对氧化膜的表面形貌及结构进行了观测。此外,用声发射(AE)技术研究了氧化膜/基体界面上缺陷的分布情况,并用激光拉曼(Raman)谱对注钇引起的膜内应力变化进行了测量。结果表明:离子注钇降低了NiO氧化膜的生长速率,提高了镍的抗氧化性能;离子注钇减小了表面NiO的晶粒尺寸,降低了膜内压应力水平;离子注钇还减小了氧化膜/基体界面缺陷的平均尺寸和数目,因而极大地提高了镍表面NiO氧化膜的粘附性和保护性。
Isothermal and cyclic oxidation behaviors of pure and yttrium-implanted nickel at 1 000℃ were studied in air. SEM and TEM were used to examine the oxide scales formed on nickel substrate. It was found that Y-implantation greatly improved the anti-oxidation ability of nickel. Acoustic emission (AE) technique was used to study the distribution of defects at the oxide/metal interface. Laser Raman microscopy was also used to study the stress status of oxide scales formed on nickel with and without Y. The main reason for the improvement in anti-oxidation and adhesion of oxide scale was Y-implantation greatly reduced the grain size of NiO and lowered the compressive stress within the scale. Meanwhile, Y-implantation reduced the size and number of interfacial defects, remarkably enhanced the adhesion of protective NiO oxide scale formed on nickel.
出处
《机械工程材料》
CAS
CSCD
北大核心
2004年第5期7-10,共4页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(59231011)
关键词
氧化
离子注入
声发射
激光拉曼
钇
镍
oxidation
ion-implantation
acoustic emission
laser Raman
yttrium
