Thermal shock behavior of platinum aluminide bond coat/electron beam-physical vapor deposited thermal barrier coatings

被引:15
|
作者
Xu, Zhenhua [1 ]
Dai, Jianwei [1 ]
Niu, Jing [2 ]
Li, Na [1 ]
Huang, Guanghong [1 ]
He, Limin [1 ]
机构
[1] Beijing Inst Aeronaut Mat, Dept 5, Beijing 100095, Peoples R China
[2] Shenyang Liming Aeroengine Grp Corp Ltd, Inst Met Technol, Ctr Tech, Shenyang 110043, Peoples R China
关键词
Thermal barrier coatings; Thermal shock; Ridge; Interface; Failure; NI-BASED SUPERALLOY; CYCLIC OXIDATION; BASE SUPERALLOY; SCALE ADHESION; MECHANISMS; SPALLATION; FAILURE; STRESS; OXIDE; DEGRADATION;
D O I
10.1016/j.jallcom.2014.08.041
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Thermal barrier coating systems (TBCs) including of chemical vapor deposited (Ni, Pt)Al bond coat with grit blasting process and electron beam physical vapor deposited Y2O3-stabilized-ZrO2 (YSZ) ceramic coating were investigated. The phase structures, surface and cross-sectional morphologies, thermal shock behaviors and residual stresses of the coatings were studied in detail. Grain boundary ridges still remain on the surface of bond coat prior to the deposition of the ceramic coating, which are shown to be the major sites for spallation damage initiation in TBCs. When these ridges are mostly removed, they appear some of cavities formation and then the damage initiation mode is deteriorated. Damage initiation and progression occurs at the bond coat to thermally grown oxide (TGO) interface leading to a buckling failure behavior. A buckle failure once started may be arrested when it runs into a region of high bond coat to TGO interface toughness. Thus, complete failure requires further loss in toughness of the bond coat to TGO interface during cooling. The suppressed cavities formation, the removed ridges at the grain boundaries, the relative high TGO to bond coat interface toughness, the uniform growth behavior of TGO thickening and the lower of the residual stress are the primary factors for prolonging the lifetime of TBCs. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:185 / 191
页数:7
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