Abstract
The applicability of LED light sources to detection of thermally grown oxide (TGO) layer in thermal barrier coating (TBC) for gas turbines was evaluated. A green LED of center wavelength 540 nm was found to be more efficient than a blue LED of center wavelength 460 nm to excite Cr3+ in the TGO layer. Using the green LED, photoluminescence was observed at 694 nm for TBC specimens heated at 1100°C. The dependence on the heating time was the same as the case of laser excitation. Using a green LED light source with higher power, photoluminescence was also observed for specimens heated at 1000°C. The results indicated that an inexpensive TGO detection system can be constructed using LED light sources.
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