摘要
目的研究不同结构参数对Mo/8YSZ热障涂层系统残余应力的影响因素。方法设计Mo/8YSZ功能梯度热障涂层,并利用ANSYS有限元软件建立了等离子喷涂Mo/8YSZ功能梯度热障涂层的数值模型,模型中考虑了材料热物理性能参数随温度变化,研究粘结层、过渡层及陶瓷层厚度对Mo/8YSZ功能梯度热障涂层残余应力的影响规律。结果随着径向距离的增大,粘结层与陶瓷层界面的残余应力逐渐由压应力变为拉应力,并且在涂层边缘位置,径向残余拉应力达到最大值。在0~12 mm路径范围内的同一位置,伴随着陶瓷层厚度的增加,粘结层与陶瓷层界面位置的轴向残余应力无明显变化,且轴向残余应力的数值几乎为0;在6~12.5 mm路径范围内的同一位置,伴随着陶瓷层厚度的增加,其剪切残余应力逐渐增大。在基体与粘结层界面边缘0.5 mm处存在着与其他位置相比更大的应力突变。粘结层与陶瓷层的厚度参数比控制在4∶10~4∶13时,涂层具有最低的热失配。过渡层与陶瓷层的厚度参数比控制在1∶4时,涂层具有最低的热失配。当功能梯度热障涂层的过渡层采用50%Mo与50%8YSZ复合而成时,将粘结层、过渡层及陶瓷层三者的厚度比值控制在16∶10∶40~16∶13∶52,涂层具有最低的热失配。结论通过设计功能梯度热障涂层,并合理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。
The work aims to research the influence factors of different structural parameters on residual stress of Mo/8 YSZ thermal barrier coating system,the functional gradient thermal barrier coating of Mo/8 YSZ was designed,and the numerical model of Mo/8 YSZ functional gradient thermal barrier coating with plasma spraying was established by using ANSYS finite element software,in which the variation of thermal and physical properties of materials with temperature was considered,and the influence of the thickness of bonding layer,transition layer and ceramic layer on the residual stress of Mo/8 YSZ functionally graded thermal barrier coating was studied.The results show that with the increase of radial distance,the residual stress at the interface between the bonding layer and the ceramic layer gradually changes from compressive stress to tensile stress,and at the edge of the coating,the radial residual tensile stress reaches the maximum value.At the same position within the path range of 0~12 mm,with the increase of ceramic layer thickness,the axial residual stress at the interface position of bonding layer and ceramic layer has no obvious change,and the value of axial residual stress is almost 0.At the same position within the path range of 6~12.5 mm,the shear residual stress gradually increases with the increase of ceramic layer thickness.At the interface edge of the substrate and bonding layer,there is a greater stress mutation at 0.5 mm than at other positions.When the ratio of thickness parameters between bond layer and ceramic layer is controlled at 4∶10~4∶13,the coating has the lowest thermal mismatch.When the thickness ratio of transition layer to ceramic layer is controlled at 1∶4,the coating has the lowest thermal mismatch.When the transition layer of functionally gradient thermal barrier coating is composed of 50%Mo and 50%8 YSZ,the thickness ratio of bonding layer,transition layer and ceramic layer is controlled at 16∶10∶40~16∶13∶52,and the coating has the lowest thermal mismatch.By designing the functional gradient thermal barrier coating and reasonably regulating the structural parameters of the thermal barrier coating system,the residual stress and stress mutation of spraying components can be further reduced and the bonding strength between the substrate and the coating can be improved.
作者
刘光
张啸寒
贾利
王亮
庞铭
安宇龙
LIU Guang;ZHANG Xiao-han;JIA Li;WANG Liang;PANG Ming;AN Yu-long(Ningbo Branch of Chinese Academy of Ordnance Science,Ningbo 315103,China;Airport College,Civil Aviation University of China,Tianjin 300300,China;Key Laboratory of Special Inorganic Coatings,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2020年第3期213-223,共11页
Surface Technology
基金
国家重点研发计划(2018YFB1105800)
国家自然科学基金(51705481)
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 spray
functionally gradient thermal barrier coating
structural parameter
thermal coupling
numerical simulation
