航空材料学报2025，Vol.45Issue(6)：60-67,8.DOI:10.11868/j.issn.1005-5053.2025.000025
热障涂层厚度太赫兹时域光谱测量影响因素分析
Analysis of factors influencing terahertz time-domain spectroscopy measurements of thermal barrier coating thickness
摘要
Abstract
To investigate the feasibility of applying the terahertz time-domain spectroscopy(THz-TDS)thickness measurement method for thermal barrier coatings in automated profiling inspection,and to understand the influence of factors such as measurement incidence angle,lift-off distance,coating refractive index and substrate curvature on thickness measurement results,theoretical analysis and experimental studies based on various test blocks are conducted.The results demonstrate that when the incident angle varies with in the range of-3° to+3°,the relative deviation in thickness measurement compared to the zero-angle condition is within 0.5%.Variations in lift-off distance within±1.5 mm result in a relative deviation within 2.6%compared to the focal position.The refractive indexs of coatings show notable variations across different sample batches,with the maximum relative deviation exceeding 6%among ten tested samples.However,the refractive index remains highly consistent across individual samples,with relative deviations largely within 2%.Experiments on curved substrates with diameters of 5 mm and 6 mm reveal that while substrate curvature reduces the maximum amplitude of the reflected wave,it does not affect the accurate identification of the time-of-flight.In summary,the THz-TDS thickness measurement method demonstrates feasibility and significant engineering application value for automated profiling detection of thermal barrier coatings on blades.关键词
太赫兹/热障涂层/厚度测量/无损检测Key words
terahertz/thermal barrier coating/thickness measurement/non-destructive testing分类
矿业与冶金引用本文复制引用
刘颖韬,赵洪美,杨万新,朱迪,杨明诚,郭广平,郑旭..热障涂层厚度太赫兹时域光谱测量影响因素分析[J].航空材料学报,2025,45(6):60-67,8.基金项目
稳定支持项目(2019-363) （2019-363）
