基于微观结构的热障涂层冲蚀机理数值分析

Numerical study on erosion mechanism for thermal barrier coatings with different microstructures

冲蚀对热障涂层寿命和可靠性会造成严重影响,为深入研究热障涂层冲蚀失效机理,建立了等离子喷涂和电子束物理气相沉积两种热障涂层典型微观结构有限元模型,同时采用LS-DYNA软件模拟了热障涂层冲蚀失效过程。分析了不同微观结构对热障涂层冲蚀失效机理的影响,研究了冲蚀粒子的速度、角度和直径对冲蚀率的影响。结果表明:微观结构对冲蚀机理有极其重要的影响,无因次冲蚀率随冲蚀粒子的速度、角度和直径的增大而增大。此数值模拟方法可为进一步研究热障涂层的抗冲蚀性能提供参考。

The erosion phenomenon has affected thermal barrier coatings’service life and durability heavily.The simulative models for air plasma spray and electron beam physical vapor deposition thermal barrier coatings with typical microstructures were built to study the thermal barrier coatings erosion mechanism.The software LS-DYNA was used to simulate thermal barrier coating erosion processes.The erosion mechanism of thermal barrier coatings with different microstructures was analyzed and the impact velocity,impact angle and erodent particle diameter effects were studied.The results show that microstructures influence erosion mechanism heavily and the non-dimension erosion rate increases with impact velocity,impact angle and erodent particle diameter.The simulation method can provide reference for further thermal barrier coatings’erosion resistance study.