Analysis of interfacial crack initiation mechanism of thermal barrier coatings in isothermal oxidation process based on interfacial stress state

被引：13
|
作者：
Hu, Dianyin [1 ,2 ,3 ]
Lv, Zhengzhe [1 ]
Liu, Haiyan [1 ]
Jing, Fulei [4 ]
Wang, Rongqiao [2 ,3 ,5 ]
机构：
[1] Beihang Univ, Res Inst Aeroengine, Beijing 100191, Peoples R China
[2] Beijing Key Lab Aeroengine Struct & Strength, Beijing 100191, Peoples R China
[3] United Res Ctr Midsmall Aeroengine, Beijing 100191, Peoples R China
[4] Corp China, Aero Engine Acad China, Aero Engine Grp, Beijing 101304, Peoples R China
[5] Beihang Univ, Sch Energy & Power Engn, Beijing 100191, Peoples R China
来源：
CERAMICS INTERNATIONAL | 2023年 / 49卷 / 07期
基金：
中国国家自然科学基金;
关键词：
Thermal barrier coatings; Thermal growth stress; Interfacial stress; Interfacial roughness; FINITE-ELEMENT SIMULATION; GROWN OXIDE; RESIDUAL-STRESSES; PART II; FAILURE CHARACTERISTICS; DAMAGE MECHANISMS; LIFETIME BEHAVIOR; TURBINE BLADE; GAS-TURBINES; BOND COATS;
D O I：
10.1016/j.ceramint.2022.11.209
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：
In this paper, the interfacial stress state is used to analyze the interfacial crack initiation mechanism of the thermal barrier coatings (TBCs) during isothermal oxidation. The influence of thermal growth stress, initial residual stress, and creep behavior on the stress distribution is considered to have an accurate simulation result. A parameter that integrates the effects of interfacial normal and tangential stress is modified for evaluating interfacial crack initiation. It is found that, in the cooling stage, the interfacial cracks sprout at the top coat (TC)/ thermally grown oxide (TGO) interface valley region and the TGO/bond coat (BC) interface peak region, which agrees with the experimental results. Furthermore, the influence of interfacial roughness on crack initiation is investigated. The result shows that different interfacial roughness affects the sprouting region of interfacial cracks and cracks within the TC layer.
引用
收藏
页码：10287 / 10297
页数：11
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