文献类型：期刊文献

英文题名：Nondestructive Interface Morphology Characterization of Thermal Barrier Coatings Using Terahertz Time-Domain Spectroscopy

作者：Ye, Dongdong[1];Wang, Weize[1];Huang, Jibo[1];Lu, Xiang[1];Zhou, Haiting[2]

机构：[1]East China Univ Sci & Technol, Key Lab Safety Sci Pressurized Syst, Minist Educ, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]China Jiliang Univ, Dept Qual & Safety Engn, Hangzhou 310018, Zhejiang, Peoples R China

年份：2019

卷号：9

期号：2

外文期刊名：COATINGS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000460700700027)】；

基金：This research was funded by National Natural Science Foundation of China (No. 51775189) and Science and Technology Commission of Shanghai Municipality Project (No. 16DZ2260604).

语种：英文

外文关键词：non-destructive; thermal barrier coatings; terahertz time-domain spectroscopy; interface morphology; erosion test

摘要：In this work, a terahertz time-domain spectroscopy (THz-TDS) system was used to measure the thickness of thermal barrier coatings (TBCs) and characterize the interface morphology of TBCs after erosion. Reflection mode, with an angle of incidence of 0, was used for inspection before and after erosion. The refractive index, thickness, and internal structure evolution tendency of the yttria-stabilized zirconia (YSZ) top coat were estimated under consideration of the interaction between the pulsed THz waves and the TBCs. The surface roughness of the top coat surface was considered for the errors analysis in the refractive index and thickness measurement. To reduce the errors introduced by the refractive index change after erosion, two mathematical models were built to assess the thickness loss. Then, the thickness loss was compared with results estimated by the micrometer inspection method. Finally, the basic erosion sample profile with R-a roughness was obtained, and the broadening of THz pulses were suggested as a possible measure for the top coat porosity change, showing that THz waves can be a novel online non-destructive and non-contact evaluation method that can be widely utilized to evaluate the integrity of TBCs applied to gas turbine blades.