预热温度对热障涂层表面裂纹形成的影响

doi:10.7527/S1000-6893.2021.26184

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预热温度对热障涂层表面裂纹形成的影响

李定骏^1,2, 杨镠育¹, 孙帆¹, 江鹏¹, 陈艺文², 王铁军¹

1. 西安交通大学航天航空学院机械结构强度与振动国家重点实验室, 西安 710049;
2. 东方电气集团东方汽轮机有限公司长寿命高温材料国家重点实验室, 德阳 618000

收稿日期:2021-08-02 修回日期:2022-06-22 出版日期:2022-06-15 发布日期:2022-07-07
通讯作者: 江鹏,E-mail:jiangpeng219@xjtu.edu.cn E-mail:jiangpeng219@xjtu.edu.cn
基金资助:
国家科技重大专项（2019-VII-0007-0147）

Effect of preheating temperature on formation of surface cracks in thermal barrier coating system

LI Dingjun^1,2, YANG Liuyu¹, SUN Fan¹, JIANG Peng¹, CHEN Yiwen², WANG Tiejun¹

1. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China;
2. State Key Laboratory of Long-Life High Temperature Materials, Dongfang Turbine Co., Ltd. of Dongfang Electric Corporation, Deyang 618000, China

Received:2021-08-02 Revised:2022-06-22 Online:2022-06-15 Published:2022-07-07
Supported by:
National Science and Technology Major Project(2019-VII-0007-0147)

摘要/Abstract

摘要： 先进航空发动机与燃气轮机热端部件的服役温度不断提高，对热障涂层性能提出了越来越高的要求。在涂层中引入一定密度的周期分布表面裂纹，可以同时提升其隔热性能和服役寿命，是一种极具潜力的先进热障涂层技术。然而，目前关于这种涂层中表面裂纹形成的力学机制研究尚不充分。以等离子喷涂热障涂层表面裂纹的形成过程为对象，发展了考虑热应力的多层结构剪切滞后模型，推导了表面裂纹形成前陶瓷层内应力场与位移场的解析解，获得了不同预热温度下陶瓷层内平均应力、平均应变能密度及总应变能随涂层厚度的演变规律，发现：在表面裂纹形成前，陶瓷层内平均应力和平均应变能密度不随其厚度改变，而总应变能随其厚度线性增大，这说明陶瓷层内总应变能是衡量能否在涂层中形成表面裂纹的关键参量；在其他喷涂参数不变的情况下，预热温度越高，表面裂纹越容易形成。本文阐明了预热温度对表面裂纹形成的影响，为实现高热障和高应变容限热障涂层的可控制备提供了理论指导。

关键词: 航空发动机, 燃气轮机, 热端部件热障涂层, 表面裂纹, 剪滞模型, 预热温度, 应变能

Abstract: Current development in advanced aero-engine and gas turbine technologies has increased the work temperature of hot components, constantly imposing higher requirements for the thermal insulation and service life of Thermal Barrier Coating system (TBCs). The introduction of periodic surface cracks with certain density into the ceramic coating to improve both thermal insulation and service life of TBCs is a new TBCs technology. However, the formation mechanism of surface cracks in the ceramic layer is still unclear. This study develops a shear-lag model considering thermal stresses in multilayer structures, and derives the analytical solutions of the stress and displacement fields in the ceramic layer before the formation of surface cracks. The evolution law of average stress, average strain energy density, and total strain energy in the plasma sprayed ceramic layer with coating thickness at different preheating temperatures is obtained. It's observed that the average stress and average strain energy density of coating layer remain the same before surface crack formation in deposition, while total strain energy keeps growing with the coating thickness, which means total strain energy is the key parameter associated with surface crack formation. Besides, it's easy to conclude that the higher preheating temperature is, the more easier surface crack formation is when the other deposition parameters are settled. The results illustrate the effect of preheating temperature on the formation of surface cracks in TBCs, providing theoretical guidance for the controllable preparation of advanced TBCs.

Key words: aero-engines, gas turbines, thermal barrier coating system for hot components, surface cracks, shear-lag model, preheating temperature, strain energy

中图分类号:

李定骏, 杨镠育, 孙帆, 江鹏, 陈艺文, 王铁军. 预热温度对热障涂层表面裂纹形成的影响[J]. 航空学报, 2022, 43(6): 526184-526184.

LI Dingjun, YANG Liuyu, SUN Fan, JIANG Peng, CHEN Yiwen, WANG Tiejun. Effect of preheating temperature on formation of surface cracks in thermal barrier coating system[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(6): 526184-526184.

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预热温度对热障涂层表面裂纹形成的影响

Effect of preheating temperature on formation of surface cracks in thermal barrier coating system

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