摘要
采用等离子喷涂技术制备了三种不同材料的热障涂层(TBC),对涂层进行了组织性能的分析比较。结果表明,Al1075的TBC结合强度最高,为24.66MPa,具有良好的抗热震性能;KF230的TBC结合强度最低,为16.06MPa;LG210的TBC结合强度居中,抗热震性能最差。分析认为,氧化物层(TGO)在热障涂层中的失效起至关重要的作用,TGO是裂纹的产生源,是裂纹扩展的通道,是热障涂层系统中的最薄弱环节。因此抑制TGO是提高涂层结合强度、改善涂层抗热震性能的重要措施。
Three kinks of thermal barrier coatings (TBC) were prepared with plasma spraying, and microstrutures and properties of the coatings were analyzed and compared. The results shows that the bonding strength of Al-1075 TBC is 24.66 MPa which is the highest strength and has great thermal shocking resistance. The bonding strength of KF-230 TBC is the lowest, 16.06 MPa. The bonding strength of LG-210 TBC is higher, but has the worst thermal shocking resistance. The analysis shows that the thermal grown oxide (TGO) plays an important role in failure of the TBCs. TGO is the origion of cracking, and is the passage of crack expansion. It is the weakest in the system. So restriction of TGO is a key method to increase the bonding strength and improve the thermal shocking resistance of the coating.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第7期49-52,共4页
Transactions of The China Welding Institution
基金
哈尔滨市学科后备带头人基金资助项目(2005AFXXJ038)
关键词
热障涂层
涂层组织性能
等离子喷涂
thermal barrier coating
microstructure and property of the coating
plasma spraying
