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涂层表面宏观损坏对热障涂层热应力分布的影响

发表时间:2015-12-15  浏览量:1653  下载量:448
全部作者: 黄太红,宋鹏,周会会,季强,罗恒,马景涛,陆建生
作者单位: 昆明理工大学材料科学与工程学院
摘 要: 燃气涡轮机叶片在服役过程中,叶片受高速气流冲蚀和异物撞击会形成2种宏观的凹坑。研究叶片的陶瓷层(YSZ)表面宏观凹坑及叶片边缘处孔洞这2种损坏对热障涂层(thermal barrier coatings,TBCs)热应力分布的影响。通过ANSYS软件,模拟TBCs在高温运行时的热应力分布及变化趋势,分析凹坑对TBCs整体使用寿命的影响。研究发现,YSZ表面的宏观凹坑会改变原有的热应力分布云图,扩大波峰处的最大拉应力区域,利于裂纹的产生,减少涂层寿命。而边缘处的孔洞会严重破坏原有的热应力分布,整个热生长层(thermal growth oxide,TGO)处于拉应力状态下,并且在孔洞底部,TGO与粘结层(bond course,BC)之间的区域存在最大热应力,严重制约了TBCs的使用寿命。
关 键 词: 复合材料;有限元模拟;热障涂层;热应力;涂层寿命
Title: Macroscopic damage influence on the thermal stress distribution in thermal barrier coatings
Author: HUANG Taihong, SONG Peng, ZHOU Huihui, JI Qiang, LUO Heng, MA Jingtao, LU Jiansheng
Organization: Faculty of Materials Science and Engineering, Kunming University of Science and Technology
Abstract: During gas turbine blades servicing, blades always formed two kinds of macroscopic pit by high velocity gas erosion and foreign impact. We researched the impact pits and the hole at the edge of blade influence on the thermal stress distribution in this paper. We simulated the thermal stress distribution and changing trend under high temperature by ANSYS. By analyzing the life span of the thermal barrier coatings (TBCs), we found that macroscopic impact pits can change the original thermal stress distribution. The impact pits can expand the maximum tensile stress area at the crest, which is conducive to the generation of cracks and reduce the coatings life. The hole can seriously break the original thermal stress distribution. The entire thermal growth oxide (TGO) is in tensile stress condition and the maximum thermal stress region exists between the TGO and bond course (BC) near the bottom of the hole. The hole severely restricts the thermal barrier coating life.
Key words: composite materials; finite element method; thermal barrier coatings; thermal stress; coating life
发表期数: 2015年12月第23期
引用格式: 黄太红,宋鹏,周会会,等. 涂层表面宏观损坏对热障涂层热应力分布的影响[J]. 中国科技论文在线精品论文,2015,8(23):2491-2496.
 
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