Measurement of Refractive Index and Thickness of Topcoat of Thermal Barrier Coating by Reflection Measurement of Terahertz Waves / テラヘルツ波の反射測定による遮熱コーティングのトップコート屈折率・膜厚測定
- Resource Type
- Journal Article
- Authors
- Kaori Fukunaga; Maya Mizuno; Mitsutoshi Okada; Norikazu Fuse; Tetsuo Fukuchi; Tomoharu Fujii; 岡田 満利; 布施 則一; 水野 麻弥; 福地 哲生; 福永 香; 藤井 智晴
- Source
- 電気学会論文誌A(基礎・材料・共通部門誌) / IEEJ Transactions on Fundamentals and Materials. 2012, 132(9):702
- Subject
- layer thickness
refractive index
terahertz waves
thermal barrier coating
topcoat
yttria stabilized zirconia
イットリア安定化ジルコニア
テラヘルツ波
トップコート
屈折率
膜厚
遮熱コーティング
- Language
- Japanese
- ISSN
- 0385-4205
1347-5533
A method to determine the refractive index and thickness of topcoat of thermal barrier coating (TBC) from the reflected waveforms of terahertz waves was developed. The method was applied to specimens of yttria stabilized zirconia (YSZ), which is the topcoat material. The obtained refractive index was in agreement with that obtained by time-domain terahertz spectroscopy in a transmission configuration, and the obtained thickness was in agreement with measurement results using a contact thickness gauge. The method was also applied to a TBC specimen, and the planar distribution of the refractive index and thickness of the topcoat were obtained. The obtained thickness was in agreement with microscope observation of the cross section of the specimen. The results show that reflection measurement of terahertz waves is useful for nondestructive testing of TBC applied to gas turbine blades.