热老化对热障涂层界面力学性能影响及数值计算

刘延宽; 袁航; 李顶河; 费宇杰

doi:10.7527/S1000-6893.2023.28507

航空学报 >

2023 , Vol. 44 >Issue 20: 428507 - 428507

DOI: https://doi.org/10.7527/S1000-6893.2023.28507

材料工程与机械制造

热老化对热障涂层界面力学性能影响及数值计算

刘延宽 ,
袁航 ,
李顶河 ,
费宇杰

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^1.中国民航大学天津市民用航空器适航与维修重点实验室，天津　300300
^2.中国民航大学航空工程学院，天津　300300
^3.中国民航大学中欧航空工程师学院，天津　300300

．E-mail： dh-li@cauc.edu.cn

收稿日期: 2023-02-01

修回日期: 2023-02-06

录用日期: 2023-05-12

网络出版日期: 2023-05-26

基金资助

国家自然科学基金(U1933102);天津市教委科研计划(2020KJ016)

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Effect of thermal aging on mechanical properties of thermal barrier coatings interface and numerical calculation

Yankuan LIU ,
Hang YUAN ,
Dinghe LI ,
Yujie FEI

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^1.Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance，Civil Aviation University of China，Tianjin 　300300，China
^2.College of Aeronautical Engineering，Civil Aviation University of China，Tianjin 　300300，China
^3.Sino-European Institute of Aviation Engineering，Civil Aviation University of China，Tianjin 　300300，China

E-mail： dh-li@cauc.edu.cn

Received date: 2023-02-01

Revised date: 2023-02-06

Accepted date: 2023-05-12

Online published: 2023-05-26

Supported by

National Natural Science Foundation of China(U1933102);Scientific Research Project of Tianjin Education Commission(2020KJ016)

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摘要

针对热生长氧化物（TGO）对热障涂层系统寿命的影响问题，利用大气等离子喷涂（APS）制备氧化钇稳定氧化锆（YSZ）热障涂层，在1 100 ℃条件下，对热障涂层进行不同时间的热老化试验。采用扫描电镜（SEM）观察并分析涂层的微观形貌，并利用界面压痕法及Almen基片弯曲法分别测量其界面断裂韧性及涂层内部应力，系统研究了TGO对涂层性能的影响规律。与此同时，利用动态热力耦合扩展逐层/实体元（TM-XLW/SE）方法对该问题进行了数值研究，采用扩展逐层方法模拟陶瓷层（TC）/TGO和粘结层（BC）/TGO之间的行为，采用八节点实体单元来构建合金基体，根据热障涂层和基体连接区域的位移、温度协调和内力平衡条件，将热障涂层和基体相互耦合，分析了在热老化作用下TGO厚度演变对热障涂层力学性能的影响规律，将数值结果与试验结论进行了对比分析，为热障涂层失效分析提供更进一步的支撑和佐证。

关键词： 热障涂层; 热生长氧化物; 界面断裂韧性; 动态热力耦合; 扩展逐层/实体元

本文引用格式

刘延宽 , 袁航 , 李顶河 , 费宇杰 . 热老化对热障涂层界面力学性能影响及数值计算[J]. 航空学报, 2023 , 44(20) : 428507 -428507 . DOI: 10.7527/S1000-6893.2023.28507

Abstract

To investigate the effect of Thermally Grown Oxide （TGO） on the life of thermal barrier coating system， Yttria Stabilized Zirconia （YSZ） was prepared by Atmospheric Plasma Spray （APS） method. Thermal barrier coating was subjected to thermal aging tests at 1 100 ℃ for different durations. Micro morphology of the coatings was observed and analyzed by Scanning Electron Microscopy （SEM）， then the interfacial fracture toughness and internal stress of the coating were measured by the interfacial indentation method and the Almen specimen bending method， respectively. The effects of TGO on the coating properties were systematically studied. Meanwhile， the dynamic Thermo-Mechanical Coupling Extended Layer-by-Layer/Solid Element （TM-XLW/SE） method was used to numerically study the problem. The extended layer-by-layer method was used to simulate the behavior between the Top Coat （TC）/TGO and the Bond Coat （BC）/TGO. The alloy matrix was constructed by eight-node solid element. According to the displacement， temperature coordination and internal force balance conditions of the connection area between the thermal barrier coating and the substrate， the thermal barrier coating and the substrate were coupled with each other. The influence of the evolution of TGO thickness on the mechanical properties of the thermal barrier coating under thermal aging was analyzed. The numerical results were compared with the experimental conclusions， which provides further support and evidence for the failure analysis of thermal barrier coatings.

Key words： thermal barrier coatings; thermally grown oxide; interfacial fracture toughness; dynamic thermal coupling; extended layer wise/solid element

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