Oxidation and thermal fatigue of EB-PVD thermal barrier coatings on tube superalloy substrate

被引：0
|
作者：
Gao Yu [1 ]
Zhang Chun-xia [1 ]
Zhou Chun-gen [1 ]
Gong Sheng-kai [1 ]
Xu Hui-bin [1 ]
机构：
[1] Beijing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, Beijing 100083, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2006年 / 16卷
关键词：
thermal barrier coatings; electron beam physical vapor deposition; oxidation; thermal shock;
D O I：
暂无
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Two-layer structured thermal barrier coatings (TBCs) (NiCoCrAlY (bond coat)+(6%-8%, mass fraction) Y2O3-stabilized ZrO2(YSZ top coat)) were deposited by electron beam physical vapor deposition (EB-PVD) on tube superalloy substrates. The samples were investigated by isothermal oxidation and thermal shock tests. It is found that the mass gains of the,substrate with and 2 without TBCs are 0.165 and 7.34 mg/cm(2), respectively. So the TBCs system is a suitable protection for the substrate. In thermal shock tests the vertical cracks initiate at the top coat and grow into the bond coat, causing the oxidation of the bond coat along the cracks. Failure of the TBCs system occurs by the spallation of the YSZ from the bond coat, and some micro-cracks are found at the location where the fragment of the YSZ top coat spalled from.
引用
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页码：S10 / S13
页数：4
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