摘要
为了突破传统双层热障涂层高温易剥离的技术瓶颈,在喷涂构件基体边缘开设应力释放槽,基于热弹塑性有限元理论,利用ANSYS有限元仿真模拟软件,建立了基于应力释放槽结构的等离子喷涂Mo/8YSZ热障涂层的数值模型,模型中考虑了材料不同温度下的热物性参数,研究了喷涂构件基体边缘不同开槽位置对热障涂层残余应力的影响规律。结果表明:改变应力释放槽的位置对基体与涂层界面边缘区域(0~2.4 mm)的径向残余应力影响更为明显;随着应力释放槽与基体和涂层界面距离的增加,基体与涂层界面同一位置的径向残余压应力逐渐减小;随着应力释放槽与基体和涂层界面距离的增加,基体与涂层界面同一位置的轴向残余拉应力逐渐减小;当应力释放槽与基体和涂层界面的距离增加至1.2 mm时,随着应力释放槽与基体和涂层界面距离的增加,轴向残余拉应力变化不明显。通过在喷涂构件基体边缘开设应力释放槽,可减小基体与涂层界面的残余应力。
In order to break through the technical bottleneck of traditional double layer thermal barrier coating which is easy to peel off at high temperature,a stress release groove was set up at the base edge of spraying components.Based on the thermal elastoplastic finite element theory and ANSYS finite element simulation software,the numerical model of Mo/8 YSZ thermal barrier coating with plasma spraying based on the stress release groove structure was established,and the thermophysical parameters at different temperatures were considered in the model.The influence of different slot positions on the residual stress of thermal barrier coating was studied.The results showed that the change of the location of the stress release groove has a more significant effect on the radial residual stress in the boundary area between the substrate and the coating(0~2.4 mm).With the increase of the distance between the stress release groove and the interface of substrate and coating the radial residual compressive stress at the same position of the interface of substrate and coating decreases gradually.With the increase of the distance between the stress release groove and the interface of substrate and coating the axial residual tensile stress at the same position of the interface of substrate and coating decreases gradually.When the distance between the location of the stress release groove and the interface of the substrate and the coating increases to 1.2 mm,the axial residual tensile stress does not change significantly with the increase of the distance between the stress release groove and the interface of the substrate and the coating.The residual stress at the interface between substrate and coating can be reduced by setting stress release groove at the edge of substrate.
作者
张啸寒
庞铭
江国业
Zhang Xiaohan;Pang Ming;Jiang Guoye(Airport College,Civil Aviation University of China,Tianjin 300300,China)
出处
《中国稀土学报》
CAS
CSCD
北大核心
2020年第4期521-531,I0003,共12页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(U1633111,51206179)
中央高校基本科研业务费项目中国民航大学专项项目(3122018D020)
中央高校基本科研业务费项目(201909)资助
中国民航大学蓝天青年科研资金项目。
关键词
等离子喷涂
热障涂层
应力释放槽
残余应力
数值模拟
plasma spraying
thermal barrier coating
stress relief groove
residual stress
numerical simulation
