Thermally Grown Oxide (TGO) layer develops and grows subjected to very high compressive residual stresses at the interface between metallic bond coat and EB-PVD thermal barrier coating. A significant decrease of such stress level is a useful indicator of incipient local detachment of the TBC. Photo-Stimulated Luminescence Piezo Spectroscopy (PLPS) provides information on the TGO stress state. In this paper a new portable PLPS instrument is described, developed to allow the in shop detection of PLPS signals on service operated blades with TBCs, to detect incipient failure. The instrument capability was verified comparing its results with the measurements performed with a commercial instrument on both TBC coated specimens aged in laboratory conditions and on new and operated components. The results confirm the system capability of prematurely detect and localise initial damage processes, before spallation of the TBC. A miniaturised probe was shaped to perform the PLPS measurement also at the leading edge. Finally the first in-shop application of the prototype is discussed starting from the results of the damage level assessment performed on operated first stage blades of a V94.3A2 gas turbine.
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ASME Turbo Expo 2006: Power for Land, Sea, and Air
May 8–11, 2006
Barcelona, Spain
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-4237-1
PROCEEDINGS PAPER
Portable Optical System for In-Situ Thermal Barrier Assessment of Service Operated Blades
Letizia De Maria,
Letizia De Maria
CESI Ricerca, Milano, Italy
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Claudia Rinaldi,
Claudia Rinaldi
CESI Ricerca, Milano, Italy
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Piero Lupetin,
Piero Lupetin
University of Trieste, Trieste, Italy
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Valter Sergo
Valter Sergo
University of Trieste, Trieste, Italy
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Letizia De Maria
CESI Ricerca, Milano, Italy
Claudia Rinaldi
CESI Ricerca, Milano, Italy
Piero Lupetin
University of Trieste, Trieste, Italy
Valter Sergo
University of Trieste, Trieste, Italy
Paper No:
GT2006-90551, pp. 647-654; 8 pages
Published Online:
September 19, 2008
Citation
De Maria, L, Rinaldi, C, Lupetin, P, & Sergo, V. "Portable Optical System for In-Situ Thermal Barrier Assessment of Service Operated Blades." Proceedings of the ASME Turbo Expo 2006: Power for Land, Sea, and Air. Volume 2: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation; Environmental and Regulatory Affairs. Barcelona, Spain. May 8–11, 2006. pp. 647-654. ASME. https://doi.org/10.1115/GT2006-90551
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