遮熱コーティングの界面酸化層の可搬型検出システムの開発

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: 2016/03/01

タイトル(英語): Development of a Portable System for Detection of Thermally Grown Oxide Layer in Thermal Barrier Coating

著者名: 福地　哲生（（一財）電力中央研究所電力技術研究所），岡田　満利（（一財）電力中央研究所エネルギー技術研究所），藤井　智晴（（一財）電力中央研究所エネルギー技術研究所）

著者名(英語): Tetsuo Fukuchi (Electric Power Engineering Research Laboratory, Central Research Insitute of Electric Power Industry), Mitsutoshi Okada (Energy Engineering Research Laboratory, Central Research Insitute of Electric Power Industry), Tomoharu Fujii (Energy Engineering Research Laboratory, Central Research Insitute of Electric Power Industry)

キーワード: 遮熱コーティング，界面酸化層，光ルミネッセンス，レーザ，クロムイオン，非破壊検査　　thermal barrier coating，thermally grown oxide layer，photoluminescence，laser，chromium ion，nondestructive testing

要約(英語): Thermal barrier coating (TBC) is applied to high temperature components in gas turbines. The thermally grown oxide (TGO) layer, which forms at the interface between the topcoat and the bondcoat, is an origin of topcoat damage, which can lead to delamination of the topcoat. In order to detect the TGO layer in in-service components, a portable detection system based on photoluminesence was developed. The system consisits of a compact, continuous wave Nd:YAG laser of wavelength 532 nm to excite Cr3+ included as an impurity in Al2O3, and a compact spectrometer with a 2-D CCD array for enhanced sensitivity to detect the photoluminescence from Cr3+ at 694.3 nm (R1) and 692.9 nm (R2). An optical probe is used to illuminate the specimen with laser light and to collect the photoluminescence. The probing region is a circle of diameter 5 mm. The optical probe is coupled to the main body by an optical fiber, which allows flexibility to match specimens with curved surfaces or complex structures. The system performance was tested using TBC specimens heated at 1000℃ and 1100℃, and an as-sprayed, unheated TBC specimen. Photoluminescence (R1, R2) was observed from heated specimens and was not observed from the unheated specimen, and agreed with previous measurement results. This system can be used for screening tests of topcoat delamination inspection, since delamination is likely to occur at locations where the TGO layer has grown.

本誌: 電気学会論文誌A（基礎・材料・共通部門誌） Vol.136 No.3 （2016）

本誌掲載ページ: 115-120 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/136/3/136_115/_article/-char/ja/