Microcrack propagation induced by dynamic infiltration of calcium-magnesium-alumino-silicate in columnar structures for thermal barrier coatings

被引：5
作者：
Tseng, Shaochen [1 ]
Chao, Chingkong [1 ]
Zhang, Weixu [2 ]
Fan, Xueling [2 ]
机构：
[1] Natl Taiwan Univ Sci & Technol, Dept Mech Engn, Taipei, Taiwan
[2] Xi An Jiao Tong Univ, Sch Aerosp Engn, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Shaanxi, Peoples R China
来源：
JOURNAL OF THE CHINESE INSTITUTE OF ENGINEERS | 2021年 / 44卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Thermal barrier coating (TBC); columnar structure; CMAS infiltration; extended finite element method (XFEM); GROWN OXIDE; CMAS; MECHANISMS; DELAMINATION; TEMPERATURE; BEHAVIOR; CRACKING; PENETRATION; SPALLATION; FRACTURE;
D O I：
10.1080/02533839.2020.1831968
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Columnar-structured thermal barrier coating systems (TBCs) possess a strain tolerant columnar microstructure wherein the gaps between the columns are filled with high-porosity oxides. A numerical model is proposed to estimate the stress fields of the microcrack induced by calcium-magnesium-alumina-silicate (CMAS) infiltration and microcrack propagation behavior in the yttria stabilized zirconia column induced by dynamic CMAS infiltration is studied using the extended finite element method. The results demonstrate that both the stress and energy release rate near microcracks were found to dramatically increase when CMAS reached a microcrack. The present analysis reveals that the vertical cracks easily initiate from the microstructure column and coalesce with adjacent horizontal and vertical pores, thereby resulting in premature failure of TBCs via delamination.
引用
收藏
页码：11 / 21
页数：11
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