Coupling effect of delamination cracks and vertical cracks on local phase transition of ceramic topcoat in thermal barrier coatings

被引：6
作者：
Dong, Hui [1 ]
Xu, Long [1 ]
Zhou, Pan-Hu [1 ]
Yang, Guan-Jun [2 ]
Wang, Li-Shuang [1 ]
Yao, Jian-Tao [1 ]
机构：
[1] Xian Shiyou Univ, Sch Mat Sci & Engn, Xian Key Lab High Performance Oil & Gas Field Mat, Xian 710065, Shaanxi, Peoples R China
[2] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2023年 / 49卷 / 08期
基金：
中国国家自然科学基金;
关键词：
Thermal barrier coatings; Local phase transition; Vertical crack; Delamination crack; STABILIZED ZIRCONIA; MECHANICAL-PROPERTIES; SINTERING BEHAVIOR; RESIDUAL-STRESSES; TGO THICKNESS; MICROSTRUCTURE; EVOLUTION; OXIDATION; LIFETIME; HAFNIA;
D O I：
10.1016/j.ceramint.2022.12.196
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The phase transition of atmospheric plasma-sprayed yttria-stabilized zirconia (APS YSZ) coating over delamination cracks in thermal barrier coatings (TBCs) was addressed by gradient thermal cycling test at 1150 degrees C to illustrate the coupling effect of delamination cracks and vertical cracks in TBCs on the phase transition. Phase structure of 15 dot-matrix micro-regions across YSZ thickness was examined by Raman spectroscopy. Three twodimensional models were built to elaborate the local temperature evolution in the YSZ coating. The phase transition of YSZ had a markedly time-space characteristic with application duration, depending on the temperature increment. The phase-transition quantity decreased radioactively from the delamination crack center to its tip and gradually decreased from the YSZ free surface to the YSZ/bond coat interface. Compared with YSZ coating only containing delamination cracks or only vertical cracks, the temperature in the YSZ coating was significantly elevated by the combination of vertical cracks and delamination cracks. The increment was in 75 degrees C-295 degrees C when the delamination crack propagated from 0.5 mm to 4.0 mm. Consequently, due to the coupling effect of delamination cracks and vertical cracks, serious sintering and phase transition of the YSZ coating would occur once the delamination crack length was beyond 0.5 mm.
引用
收藏
页码：13176 / 13184
页数：9
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