引用本文:胡祯，李争显，刘林涛，杨晨曦.YSZ活性扩散障结构应力的有限元分析[J].中国表面工程,2015,28(5):64~70
HU Zhen, LI Zhengxian, LIU Lintao, YANG Chenxi.Finite Element Analysis of Structural Stress in YSZ Active Diffusion Barrier Coating[J].China Surface Engineering,2015,28(5):64~70
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YSZ活性扩散障结构应力的有限元分析
胡祯，李争显，刘林涛，杨晨曦1,2
1. 西安建筑科技大学 冶金工程学院;2. 西北有色金属研究院 腐蚀与防护研究所
摘要:
利用有限元分析法建立了镍基合金基体/Al2O3/Zr/Al2O3/NiCrAlY粘结层模型，模拟计算了温度快速变化时扩散障的应力集中区域及应力水平，分析了扩散障的厚度及界面形貌对扩散障结构应力的影响。结果表明：在温度急剧变化过程中，扩散障内应力水平较高的区域主要出现在Al2O3层，特别是在Al2O3层中段、非平整界面的尖点、拐点处以及曲面的凹凸不平处；扩散障内应力值随Al2O3层和Zr层的增大而减小，且Al2O3层厚度变化对应力的影响比Zr层厚度变化的影响大；非平整界面最大等效应力比平整界面高约1 000 MPa。
关键词:  活性扩散障  有限元  结构应力
DOI：10.11933/j.issn.1007-9289.2015.05.010
分类号:
基金项目:
Finite Element Analysis of Structural Stress in YSZ Active Diffusion Barrier Coating
HU Zhen, LI Zhengxian, LIU Lintao, YANG Chenxi1,2
1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology;2. Institute of Corrosion and Protection, Northwest Institute for Nonferrous Metal Research
Abstract:
To analyze the stress concentration areas and stress level in the active diffusion barrier coating, a finite element analysis (FEA) model of Nibased substrate/Al2O3/Zr/Al2O3/NiCrAlY bond coating was established under a rapidly changing temperature condition. The effects of the thickness and interface morphology of the diffusion barrier coating were evaluated. The results show that high stress concentration areas were mainly in the alumina scale, especially in the middle part, the sharp points, inflections and interface irregularities, during the drastic change of temperature. The stress decreases with increasing thickness of Al2O3 scale and the zirconium layer . Meanwhile, the effect of stress on the thickness of Al2O3 scale is more sensitive than that of the zirconium layer. Additionally, the maximum equivalent stress on the nonflat interface is 1 000 MPa higher than that of the flat interface.
Key words:  active diffusion barrier coating  finite element  structural stress
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