钟建兰,敖波,古玉祺.基于真实TGO三维结构的热障涂层热应力分析[J].稀有金属材料与工程,2018,47(7):2100~2106.[Jianlan Zhong,Bo Ao,Yuqi Gu.Thermal Stress Analysis on Thermal Barrier Coatings Based on Real three-dimensional Structure of Thermally Grown Oxide[J].Rare Metal Materials and Engineering,2018,47(7):2100~2106.]
基于真实TGO三维结构的热障涂层热应力分析
投稿时间:2017-11-10  修订日期:2018-07-05
中文关键词:  热障涂层  X射线显微镜  有限元模型  热应力分析
基金项目:国家自然科学基金资助(项目号51561025)
中文摘要:
      本文采用三维X射线显微镜对高温热循环后的双层结构热障涂层样品进行了分辨率0.5 μm的高分辨率CT (Computed Tomography)重建,实现了热生长氧化物 (Thermally Grown Oxide,TGO)三维结构分割与可视化,建立了基于真实TGO微结构的热障涂层三维有限元模型,研究了蠕变及热循环次数对热障涂层热应力的影响。有限元分析结果表明:恒温阶段受蠕变的影响,应力大幅度减小,高温蠕变对热障涂层热应力具有释放作用。三维热应力分布结果表明粘结层与TGO界面处应力最大。热障涂层的应力随着热循环次数的增加而增大,但在15个循环之后,应力趋于稳定。
Thermal Stress Analysis on Thermal Barrier Coatings Based on Real three-dimensional Structure of Thermally Grown Oxide
英文关键词:Thermal barrier coating  X-ray microscope  Finite element model  Thermal stress analysis
英文摘要:
      Using X-ray microscope, thermal barrier coatings (TBCs) were imaged with a high resolution of 0.5 μm after high temperature cycles. Three-dimensional segmentation and extraction of thermally grown oxide (TGO) was performed. A finite element analysis model of thermal barrier coatings was established based on real three-dimensional (3D) structure of thermally grown oxide, and the effect of creep and thermal cycles on the stress distribution of thermal barrier coatings were researched. The results of finite element analysis show that the stress decreases greatly due to the influence of creep at the keeping stage. The results of three-dimensional thermal stress distribution shows that the thermal stress at the interface between the bond coat and the TGO is the maximum. The stress of thermal barrier coating increases with the increase of thermal cycle number, but the stress tends to be stable after 15 thermal cycles.
作者单位E-mail
钟建兰 南昌航空大学 无损检测技术教育部重点实验室 150808040102@stu.nchu.edu.cn 
敖波 南昌航空大学 无损检测技术教育部重点实验室 aobo0328@163.com 
古玉祺 南昌航空大学 无损检测技术教育部重点实验室  
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