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采用有限元分析软件ANSYS对等离子喷涂Sm2Zr2O7热障涂层在金属基体材质类型、厚度、半径变化时涂层的冲击热应力进行了分析。结果表明,涂层表面及表面层/金属粘结层界面处热应力及其应力梯度随着金属基体热膨胀系数增加而增大。当基体厚度超过20mm后,其对冲击热应力的影响基本可以忽略。当基体半径达到28mm后,涂层最大径向冲击热应力趋于稳定,最大轴向热应力随基体半径增加逐渐减小,最大剪切应力不受基体半径的影响。
The impact thermal stress of the coating on the plasma sprayed Sm2Zr2O7 thermal barrier coatings was analyzed by finite element analysis software ANSYS when the type, thickness and radius of the metal substrate were changed. The results show that the thermal stress and the stress gradient at the interface of the coating and the surface / metal bonding layer increase with the increase of the thermal expansion coefficient of the metal matrix. When the substrate thickness exceeds 20mm, its impact on thermal shock stress can be neglected. When the radius of the substrate reaches 28mm, the maximum radial thermal shock stress of the coating tends to be stable. The maximum axial thermal stress decreases with the increase of the substrate radius, and the maximum shear stress is not affected by the radius of the substrate.