摘要
针对EB-PVD制备的热障涂层,通过对拉伸、疲劳、持久、撞击、慢速压缩、三点弯曲、振动等单一条件下,以及热循环、热冲击、超温等复合条件下涂层微观损伤特点进行观察,结合机械应力、热应力特点以及涂层氧化损伤过程,对热障涂层微观损伤类型进行划分。总结归纳出陶瓷层晶簇间垂直裂纹、陶瓷层水平台阶裂纹、陶瓷层V形崩裂、柱状晶弯折、柱状晶簇崩落、等轴晶区水平裂纹、陶瓷层水平撕裂、陶瓷层微鼓分离、氧化层破碎、粘结层内氧化、粘结层垂直裂纹、粘结层裂纹钝化、粘结层皱曲等13种损伤形式,这些基本损伤构型的归纳总结有助于对热障涂层复杂环境下失效行为的深入研究。
In this paper,the damage behaviour of a thermal barrier coating（ TBC） produced using ED-PVD method was investigated on the basis of microstructure analysis. One of such mechanical loadings as tensile,fatigue,creeping,impact,compression,bending and vibration was separately applied on the TBC specimens in the research. A combination of mechanical loadings with conditions of thermal fatigue,thermal shock or overheating was also used in this investigation. It is found that the damage behaviour of the TBC under these typical conditions can be grouped into 13 categories from the perspective of microstructure. These categories will play a significant role in understanding the failure behaviour of the TBC in complicated servicing environment.
作者
姜涛
刘德林
刘洲
牟仁德
何利民
JIANG Tao;LIU De-lin;LIU Zhou;MU Ren-de;HE Li-min(AECC Beijing hlstitute of Aeronautical Materials,Beijing 100095,China;Failure Analysis Center of Aviation Industry Corporation of China,Beijing 100095,China;Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation,Beijing 100095,China;Aviation Key LaboratoU of Science and Technology on Materials Testing and Evaluation,Beijing 100095,China)
出处
《失效分析与预防》
2018年第4期261-267,共7页
Failure Analysis and Prevention
关键词
热障涂层
典型条件
微观损伤行为
应力
氧化
裂纹
损伤形式
thermal barrier coatings（TBC）
typical conditions
microstructural damage behaviour
stress
oxidation
cracks
damage mode
