摘要
为了突破传统Mo/8YSZ双层热障涂层高温易剥落的技术瓶颈,利用ANSYS有限元软件建立等离子喷涂Mo/8YSZ功能梯度热障涂层的数值模型,考虑材料热物性参数随温度的变化情况,研究基体、黏结层及陶瓷层的厚度参数对涂层残余应力的影响。结果表明:随着基体厚度的增加,喷涂构件的最大径向残余拉应力和最大径向残余压应力均减小;随着黏结层、过渡层和陶瓷层厚度的增加,最大径向残余拉应力增大,最大径向残余压应力减小;残余压应力为轴向的主要残余应力形式,随着基体厚度的增加,最大轴向残余压应力减小,随着黏结层或过渡层厚度的增加,最大轴向残余压应力增大,然而陶瓷层厚度的变化对最大轴向残余压应力的影响并不明显;改变黏结层厚度对基体与涂层界面残余压应力的影响更为明显;基体的厚度在一定范围内对基体与涂层界面残余应力有影响,当基体厚度增加至12 mm时,随着基体厚度的增加,径向残余应力变化不明显;随着基体厚度的增加,应力突变点及应力形式的转变点逐渐过渡到基体与涂层交界边缘的上方区域,随着黏结层、过渡层或陶瓷层厚度的增加,应力突变点及应力形式的转变点逐渐过渡到基体与涂层交界中心的下方区域。通过设计功能梯度热障涂层,并调控热障涂层系统的结构参数,可进一步减小喷涂构件的残余应力和应力突变情况,提升基体与涂层的结合强度。
In order to break through the technical bottleneck of traditional Mo/8YSZ double-layer thermal barrier coating which is easy to peel off at high temperature,the influence of the thickness of matrix,bonding layer,transition layer and ceramic layer on the residual stress of Mo/8YSZ functional gradient thermal barrier coating were studied.The numerical model of plasma spraying Mo/8YSZ functional gradient thermal barrier coating was established by using ANSYS finite element software.In the model,the variation of material thermal and physical parameters with temperature was considered,and the influence of different substrate,bonding layer,transition layer and ceramic layer thicknesses on the residual stress of functional gradient thermal barrier coating was analyzed.The results show that the maximum radial residual tensile stress and maximum radial residual compressive stress decrease with the increase of substrate thickness.With the increase of the thickness of bond layer,transition layer and ceramic layer,the maximum radial residual tensile stress increases and the maximum radial residual compressive stress decreases.Residual compressive stress is the main form of axial residual stress,with the increase of substrate thickness,maximum axial residual compressive stress of coating decreases,and with the increase of bonding layer or transition layer thickness,the maximum axial residual compressive stress increases,however,the change of ceramic layer thickness does not obviously effect the maximum axial residual compressive stress.The effect of changing the thickness of adhesive layer on the interface residual compressive stress is more obvious.The influence of the thickness of the matrix on the interface residual stress between the matrix and coating is within a certain range.When the substrate thickness increases to 12 mm,with the increase of the substrate thickness,the variation difference of the radial residual stress between the substrate and coating interface decreases.With the increase of the substrate thickness,the transition point and stress transition point of the stress form gradually transfer to the upper part of the boundary between the substrate and coating.With the increase of the thickness of the bonding layer,transition layer or ceramic layer,the transition point and stress transition point of the stress form gradually transfer to the lower part of the central area of the interface between the substrate and coating.By designing the functional gradient thermal barrier coating and adjusting the structural parameters of the thermal barrier coating system reasonably,the residual stress and stress mutation of the spraying component can be further reduced and the bonding strength between the substrate and coating can be improved.
作者
庞铭
张啸寒
PANG Ming;ZHANG Xiaohan(Airport College,Civil Aviation University of China,Tianjin 300300,China)
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2020年第6期23-32,共10页
Journal of Aeronautical Materials
基金
国家自然科学基金(U1633111,51206179)
中央高校基本科研业务费项目中国民航大学专项资助(3122018D020)
中国民航大学蓝天青年科研资金资助项目
中央高校基本科研业务费资助项目(201909)。
关键词
等离子喷涂
功能梯度热障涂层
结构参数
热力耦合
数值模拟
plasma spraying
functional gradient thermal barrier coating
structural parameter
thermal coupling
numerical simulation
作者简介
通讯作者:庞铭(1980-),男,博士,教授,主要从事结构强度评估、材料表面改性与再制造技术的研究,E-mail:pangming1980@126.com。
