テラヘルツ波を用いたガスタービン翼遮熱コーティングのトップコート膜厚測定

カテゴリ: 論文誌(論文単位)

グループ名: 【A】基礎・材料・共通部門

発行日: 2013/07/01

タイトル(英語): Topcoat Thickness Measurement of Thermal Barrier Coating of Gas Turbine Blade using Terahertz Wave

著者名: 福地　哲生（電力中央研究所 電力技術研究所），布施　則一（電力中央研究所 電力技術研究所），岡田　満利（電力中央研究所 エネルギー技術研究所），尾関　高行（電力中央研究所 エネルギー技術研究所），藤井　智晴（電力中央研究所 エネルギー技術研究所），水野　麻弥（情報通信研究機構 電磁波計測研究所），福永　香（情報通信研究機構 電磁波計測研究所）

著者名(英語): Tetsuo Fukuchi (Central Research Institute of Electric Power Industry), Norikazu Fuse (Central Research Institute of Electric Power Industry), Mitsutoshi Okada (Central Research Institute of Electric Power Industry), Takayuki Ozeki (Central Research Institute of Electric Power Industry), Tomoharu Fujii (Central Research Institute of Electric Power Industry), Maya Mizuno (National Institute of Information and Communications Technology), Kaori Fukunaga (National Institute of Information and Communications Technology)

キーワード: ガスタービン翼，遮熱コーティング，トップコート，テラヘルツ波，膜厚測定　　gas turbine blade，thermal barrier coating，topcoat，terahertz wave，layer thickness measurement

要約(英語): The topcoat thickness of thermal barrier coating (TBC) applied to a gas turbine blade was meaured using terahertz waves. The refractive index of the topcoat was obtained by frequency analysis of the waves reflected from the topcoat surface and the interface between the topcoat and bondcoat. The surface roughness of the topcoat surface was considered for improving the accuracy of the refractive index calculation. The topcoat thickness was obtained from the refractive index and the time separation between the reflected waves. The validity of the method was confirmed using a TBC sample with variable topcoat thickness, and the obtained topcoat thickness was in agreement with measurement results using a contact thickness gauge. Error analysis showed that the measurement error of the topcoat thickness was about 3%. The method was applied to a gas turbine blade with TBC, and the measured topcoat thickness agreed with microscope observation results of the cross section to within 6%, which was within the range of measurement error. The effect of curvature of the gas turbine blade surface did not result in significant measurement error. The results showed that terahertz waves are effective for nondestructive measurement of the topcoat thickness of TBC applied to gas turbine blades.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.133 No.7 （2013）

本誌掲載ページ: 395-401 p

原稿種別: 論文／日本語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejfms/133/7/133_395/_article/-char/ja/