Advanced analysis on growth mechanisms of thermally grown oxide at elevated temperature for thermal barrier coatings

被引：18
|
作者：
Song, Xuemei [1 ]
Meng, Fangli [1 ]
Kong, Mingguang [2 ]
Liu, Ziwei [1 ]
Wang, Yongzhe [1 ]
Huang, Liping [3 ]
Zheng, Xuebin [3 ]
Zeng, Yi [1 ,4 ]
机构：
[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China
[2] Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China
[3] Chinese Acad Sci, Shanghai Inst Ceram, Key Lab Inorgan Coating Mat, Shanghai 200050, Peoples R China
[4] CAS Ctr Excellence Superconducting Elect CENSE, Shanghai 200050, Peoples R China
来源：
VACUUM | 2016年 / 134卷
关键词：
TBCs; Heat treatment; TGO; Bond coat; Growth mechanisms; Ion diffusion; SELF-DIFFUSION; SINGLE-CRYSTALS; BOND COAT; ALPHA-AL2O3; ALUMINA; TBCS;
D O I：
10.1016/j.vacuum.2016.09.012
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) were prepared by plasma spraying. The as prepared YSZ TBCs were characterized by scanning electron microscopy (SEM), Electron backscatter diffraction (EBSD) and focused ion beam (FIB) systems before and after heat treatment. A thermally grown oxide (TGO) layer was formed between YSZ topcoat and bond coat after heat treatment. EBSD results revealed that the TGO layer was composed of alpha-Al2O3 and cubic Al2NiO4 layers. Mechanism controlling the growth of the TGO layer were analyzed in detail. It was found that the AlNi phase gradually disappeared from bond coat during heat treatment, which provided Al and Ni sources for the formation of TGO. Meanwhile, EBSD results confirmed that the growth of the TGO layer was dominated by the diffusion of Al and Ni rather than 0 penetration. Furthermore, direct evidence on the diffusion pathways of Al and Ni was also found, indicating that Al and Ni proceeded along the pores, cracks and YSZ grain boundaries to promote the further growth of TGO layer with increased heat treatment time. (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：33 / 39
页数：7
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