涂层结构对AlSi/PHB封严涂层热应力影响的有限元分析

可磨耗封严涂层是提升航空发动机气密性和运行效能的一种重要途径，而涂层结构对其热应力及使用寿命具有重要影响。本研究以AlSi/PHB封严涂层为研究对象，利用ABAQUS有限元仿真软件和Python编程语言建立了具有不同结构参数的涂层有限元模型，系统研究了面层厚度、聚苯酯颗粒及孔隙结构特性对热震工况下涂层热应力的影响规律。结果表明：当面层厚度为0.1 mm～1.9 mm时，面层厚度对涂层-基体界面应力的影响小于其对涂层侧面应力的影响，且当面层厚度超过0.3 mm左右时，涂层中出现最大拉应力的部位由涂层-基体界面转变为涂层侧面；当聚苯酯颗粒含量为30 vol.%～50 vol.%时，随着聚苯酯含量的增加，涂层-基体界面和涂层侧面的峰值应力均波动不明显；当面层孔隙率为5 vol.%～15 vol.%时，涂层-基体界面峰值应力随孔隙率的增大呈现先降低后增大的趋势；当孔隙直径为60μm～110μm时，涂层内部峰值拉应力随孔隙直径的增大而增大。综合考虑涂层结构与热应力的关系，AlSi/PHB封严涂层的结构参数优选为：面层厚度为0.3 mm～1.1 mm之间，聚苯酯颗粒含量为40 vol.%～50 v...

Finite Element Analysis of the Effect of Coating Structure on the Thermal Stress of AlSi / PHB Sealing Coating

The abradable sealing coating is an important way to improve the air tightness and efficiency of aviation engines, and the coating structure has a significant impact on its thermal stress and service life. In this study, AlSi / PHB sealing coating was used as the research object, and the finite element model of the coating with different structural parameters were established using ABAQUS finite element simulation software and Python programming language. The effects of top-layer thickness, PHB particle and pore structures on the thermal stress of the coating under thermal shock conditions were systematically studied. The results show that when the top-layer thickness is from 0.1mm to 1.9mm, the effect of the thickness on the stress at the coating-substrate interface is less than that on the stress at the side of the coating. When the top-layer thickness exceeds about 0.3 mm, the part of the coating where the maximum tensile stress occurs changes from the coating-substrate interface to the side of the coating. When the content of PHB particles is 30 to 50 vol.%, the peak stresses at the coating-substrate interface and the side of the coating do not fluctuate significantly with the increase of PHB particle content. When the porosity of the top layer is 5 to 15 vol.%, the peak stress at the coating-substrate interface decreases first and