High temperature oxidation behavior of hafnium modified NiAl bond coat in EB-PVD thermal barrier coating system

被引:114
作者
Guo, Hongbo [1 ]
Sun, Lidong [1 ]
Li, Hefei [1 ]
Gong, Shengkai [1 ]
机构
[1] Beijing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, Beijing 100083, Peoples R China
关键词
thermal barrier coatings (TBCs); NiAl; hafinium; oxidation; electron beam physical vapor deposition (EB-PVD); thermal cycling;
D O I
10.1016/j.tsf.2007.07.031
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
NiAl coatings doped with 0.5 at.% and 1.5 at.% Hf were produced by co-evaporation of NiAl and Hf ingots by electron beam physical vapor deposition (EB-PVD), respectively The addition of 0.5 at.% Hf significantly improved the cyclic oxidation resistance of the NiAl coating. The TGO layer in the 1.5 at. % Hf doped NiAl coating is straight; while that in the 0.5 at.% Hf doped coating became undulated after thermal cycling. The doped NiAl thermal barrier coatings (TBCs) revealed improved thermal cycling lifetimes at 1423 K, compared to the undoped TBC. Failure of the 0.5 at.% Hf doped TBC occurred by cracking at the interface between YSZ topcoat and bond coat, while the 1.5 at.% Hf doped TBC cracked at the interface between bond coat and substrate. (C) 2007 Published by Elsevier B.V.
引用
收藏
页码:5732 / 5735
页数:4
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