摘要
采用等离子喷涂(atmospheric plasma spraying,APS)技术在镍基高温合金(GH99)上沉积MCrAlY粘结涂层,并进行超音速颗粒轰击处理。研究超音速颗粒轰击工艺对MCrAlY涂层高温氧化性能的影响。利用扫描电镜、X射线衍射仪、辉光光谱仪对涂层的氧化物演化过程进行观察和分析。结果表明,表面超音速颗粒轰击处理后,涂层表面所生成的氧化物较细小,能快速形成致密连续的氧化膜,保护了粘结层中其它元素的进一步氧化,避免了Ni(Cr,Al)2O4等大颗粒氧化物的形成,延缓了涂层中裂纹的产生和扩展,有效地改善了涂层抗高温氧化性能。
MCrAlY bonding coating was deposited on GH99 high-temperature alloy using atmospheric plasma spraying(APS). The influence of supersonic fine particles bombarding on microstructure and thermally grown oxide of MCrAlY coating was investigated, and the interface,phase constituents and the evolution of the coating exposed at 1 100 ℃ for different times was evaluated by SEM, XRD and glow discharge spectroscopy. The experimental results showed that the oxide particles were fine through supersonic treating, then Al2O3 scale formed quickly on MCrAlY surface, and Ni and Cr were prevented from oxidizing. For this reason, the formation of Ni (Cr,Al)2O4 can be avoided and flaw decreases, so that the high-temperature oxidation resistance of coating is improved.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2008年第11期29-32,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(50575220)
关键词
热障涂层
超音速颗粒轰击
热生长氧化物
等离子喷涂
MCrAlY粘结层
thermal barrier coating
supersonic fine particles bombarding
thermally grown oxide
plasma spraying
MCrAlY bond coat
