Cyclic Oxidation Behavior of an EB-PVD CoCrAlY Coating Influenced by Substrate/coating Interdiffusion

被引：15
作者：
Liang Tianquan [1 ,2 ]
Guo Hongbo [1 ]
Peng Hui [1 ]
Gong Shengkai [1 ]
机构：
[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China
[2] Guangxi Univ, Sch Mat Sci & Engn, Nanning 530004, Peoples R China
来源：
CHINESE JOURNAL OF AERONAUTICS | 2012年 / 25卷 / 05期
基金：
中国国家自然科学基金;
关键词：
CoCrAlY coating; cyclic oxidation; degradation; interdiffusion; substrate composition; THERMAL BARRIER COATINGS; HIGH-TEMPERATURE OXIDATION; SUPERALLOY DZ 125; ALUMINIDE COATINGS; BASE SUPERALLOYS; SCALE ADHESION; BOND COAT; AIR; MECHANISM; LIFETIME;
D O I：
10.1016/S1000-9361(11)60447-0
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
To reveal the influence of substrate/coating interdiffusion on the cyclic oxidation property of a metallic coating, cyclic oxidation behavior of an EB-PVD CoCrAlY coating on directionally solidified Ni-based superalloy DZ125 at 1 050 degrees C is investigated. The 40 mu m thick CoCrAlY coating has a cyclic oxidation life of around 160 h, and the oxidation constant is 1.915x10(-7) mg(4).cm(-8).s(-1). However, severe spallation of the oxides containing Co, Cr, Ni, Ta and Ti occurs with longer cyclic oxidation. The degradation in oxidation resistance for the coating is related to the depletion of Al due to the oxide spallation and interdiffusion. Severe interdiffusion between the coating and underlying substrate occurs at 1 050 degrees C. The composition of the substrate has an important effect on the thermal cycling lifetime of the coating. The influencing mechanism is discussed.
引用
收藏
页码：796 / 803
页数：8
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