航空发动机用双陶瓷热障涂层的残余应力仿真研究  

Simulation Research on Residual Stress of Dual Ceramic Thermal Barrier Coatings for Aero-engine

作　　者：王敏 赵伟文 刘星宇 余宗键 袁建辉[2] WANG Min;ZHAO Weiwen;LIU Xingyu;YU Zongjian;YUAN Jianhui(Shanghai Technical Institute of Electronics&Information,Shanghai 201400,China;Shanghai University of Engineering Sciences,Shanghai 201620,China)

机构地区：[1]上海电子信息职业技术学院,上海201400 [2]上海工程技术大学,上海201620

出　　处：《表面技术》2025年第3期193-201,共9页Surface Technology

基　　金：中国博士后科学基金(2021M691341)。

摘　　要：目的对YSZ和LaMgAl11O19双陶瓷热障涂层不同预热温度和厚度条件下的残余应力进行仿真研究,指导双陶瓷热障涂层的优化设计。方法用Abaqus有限元软件模拟双陶瓷涂层样件制备以及冷却过程中的径向、轴向和剪切残余应力。通过在25~275℃之间每隔50℃选取一个温度点作为样件的预热温度进行仿真,评价不同预热温度下黏结层与双陶瓷层的残余应力值,根据残余应力值确定优化的预热温度为75~125℃。选取100℃预热温度,保持YSZ和LaMgAl11O19双陶瓷层的总厚度为300µm,以50µm为一个区间调整双陶瓷层的厚度比值,研究YSZ和LaMgAl11O19的厚度变化对黏结层和双陶瓷层界面残余应力的影响,确定YSZ和LaMgAl11O19的厚度均为150µm时,获得的残余应力最小。对优化后的陶瓷顶面和不同材料分界面的残余应力进行分析。结果预热温度以及YSZ和LaMgAl11O19的厚度对涂层残余应力有显著影响,预热温度取75℃和125℃之间时,残余应力值普遍较小,其最大值仅为8.2 MPa。预热温度取100℃,YSZ和LaMgAl11O19的厚度均为150µm时的残余应力值普遍较小,其最大值仅为55.2MPa,出现在黏结层和基体材料的界面上。结论预热温度对样件边缘位置的残余应力具有明显的影响,最大残余应力出现在优化的双陶瓷热障涂层基体和黏结层的界面处,从而降低了陶瓷层剥落的风险。It is an advanced method to optimize the design of dual ceramic thermal barrier coatings through finite element analysis with Abaqus.An optimized structure is achieved by comparing different pre-heating temperatures and varying the thickness of the dual ceramic coating under cooling condition,reducing the axial,radial and shear residual stress between LaMgAl11O19 surface.A 2D axisymmetric finite element model was constructed to simulate the real cooling situation of the sample.The thermal convection coefficient was fixed at 65 W/(m2·℃),and the thickness of both YSZ and LaMgAl11O19 was set to 150µm.The pre-heating temperature of the substrate varied from 25℃to 275℃with an interval of every 50℃.As the sample approached the edge,the residual stress increased.The minimum axial stress at the edge appeared under 125℃pre-heating,and the minimum shear residual stress was 8.2 MPa between 75℃and 125℃.Next,the preheating temperature was set to 100℃,and the relative thickness of dual ceramic layers was changed.The total thickness maintained at 300µm,with the thickness of YSZ varying from 0µm to 300µm in intervals of 50µm and that of LaMgAl11O19 from 300µm to 0µm.Simulation results indicated that the maximum radial stress occurred when the thickness of LaMgAl11O19 was 300µm and that of YSZ was 0µm,while the maximum shear stress appeared when the thickness of LaMgAl11O19 was 0µm and that of YSZ was 300µm,and both situations led to the maximum axial stress.The structures of LaMgAl11O19 with a thickness of 300µm and YSZ with a thickness of 0µm resulted in compressive stress,while structures of LaMgAl11O19 with a thickness of 0µm and YSZ with a thickness of 300µm led to tensile stress and the minimum stress occurred when the thickness of both LaMgAl11O19 and YSZ was 150µm,and the stress decreased significantly when the their thickness was similar.When the optimized design was used under a pre-heating temperature of 100℃and a thickness of 150µm for both LaMgAl11O19 and YSZ,the radial residual st

关 键 词：双陶瓷层 热障涂层 YSZ LaMgAl11O19 残余应力 仿真 

分 类 号：TG174[金属学及工艺—金属表面处理]