【摘要】 采用有限元方法，建立了考虑界面形貌的热障涂层系统三维有限元模型，通过计算从高温冷却到室温时界面处的残余应力的变化，研究了界面形貌对热障涂层系统残余应力的影响。结果表明，氧化层（TGO）厚度不仅会影响残余应力大小，还会影响其应力状态，氧化层越厚，其残余应力水平越高；界面幅值增大会使黏结层（BC）–TGO界面残余应力增大，但其对陶瓷层（TC）–TGO界面处残余应力的影响较为复杂；增大界面波长会在一定程度上减小残余应力水平；三维混合粗糙度对残余应力的影响较小。因此，氧化层厚度、界面幅值和波长会较大程度上影响热障涂层的残余应力，进而影响热障涂层系统的稳定性，且氧化层厚度对涂层失效位置具有决定性意义。更多还原

【Abstract】 A 3D finite element model of thermal barrier coating(TBC) system considering the interface morphology is established by using the finite element method. By calculating the change of residual stress at the interface when cooling from high temperature to room temperature, the influence of interface geometry on the residual stress of the TBC system is studied. The results show that the thickness of the TGO layer not only affects the magnitude of the residual stress, but also affects the stress state, and the thicker the TGO layer, the higher the residual stress level in the same model. The increase of the interface amplitude will increase the residual stress at the interface of the bond layer(BC) – TGO, but its influence on the residual stress at the interface of the ceramic layer(TC) – TGO is more complicated. The effect of increasing the interface wavelength will reduce the residual stress level to some extent; The 3D hybrid roughness parameter has less effect on the residual stress. Therefore, the thickness of the oxide layer, the interface amplitude and the wavelength will greatly affect the residual stress of the TBC, which in turn affects the stability of the TBC system, and the thickness of the oxide layer has a decisive significance on the failure location of the coating.更多还原