摘要
高温陶瓷热障涂层的厚度、裂纹、孔隙及孔隙率等微观结构是评价涂层热障性能的关键参考,该文以三层结构热障涂层为研究对象,并用三维X射线显微镜与扫描电子显微镜,从二维和三维视角研究了热障涂层形貌、厚度、孔隙及孔隙率等结构特征。涂层服役前后的二次电子和背散射电子扫描分析表明,涂层具有自愈合层致密性结构和内层非致密瑕疵区存在。三维X射线显微镜采集的三维图像大尺度展示了裂纹以及孔隙等微观结构信息。通过灰度值分析,评判了自愈合层的致密度及其强阻氧性能,运用各功能涂层灰度值差异对比评判它们之间的结合强度。结果显示,两种设备的图像解析结果基本一致,为高温陶瓷热障复合涂层微观结构特征的全面解析提供了可行策略。
The thickness,cracks,pores,and porosity of high-temperature ceramic thermal barrier coatings are critical parameters for evaluating their thermal barrier performance.This study focuses on three-layer thermal barrier coatings,investigating their morphology,thickness,pores,and porosity from two-dimensional and three-dimensional perspectives using 3D X-ray microscopy and scanning electron microscopy.Secondary electron and backscattered electron scanning analyses of the coatings before and after service reveal a dense self-healing layer structure and the existence of porous defect areas in the inner layer.The three-dimensional images collected by 3D X-ray microscopy reveal microstructural information,such as cracks and pores,on a large scale.Through grayscale value analysis,the density and strong oxygen resistance of the self-healing layer were evaluated,and the bonding strength between the functional coatings was estimated by comparing their grayscale value differences.The results indicate that the findings from the two techniques are basically consistent,providing a feasible strategy for the comprehensive analysis of the microstructural characteristics of high-temperature ceramic thermal barrier composite coatings.
作者
胡鹏飞
林杰
姜云
陈静涛
孙银洁
谢忱
鲁波
HU Pengfei;LIN Jie;JIANG Yun;CHEN Jingtao;SUN Yinjie;XIE Chen;LU Bo(Instrumental Analysis and Research Center,Shanghai University,Shanghai 200444,China;Key Laboratory of Advanced Functional Composite Materials Technology,Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China)
出处
《实验科学与技术》
2026年第1期31-37,共7页
Experimental Science and Technology
基金
航天材料及工艺研究所先进功能复合材料技术重点实验室一般项目(61429062202)
上海市科委面上项目(20010500200)。
关键词
热障涂层
微观结构
孔隙率
裂纹
三维X射线显微镜
扫描电子显微镜
thermal barrier coatings
microstructure
porosity
cracks
3D X-ray microscope
scanning electron microscope
