NDLI: Portable Optical System for In-Situ Thermal Barrier Assessment of Service Operated Blades

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Maria, Letizia De Rinaldi, Claudia Lupetin, Piero Sergo, Valter
Copyright Year	2006
Abstract	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.
Sponsorship	International Gas Turbine Institute
Starting Page	647
Ending Page	654
Page Count	8
File Format	PDF
ISBN	0791842371
DOI	10.1115/GT2006-90551
e-ISBN	0791837742
Volume Number	Volume 2: Aircraft Engine; Ceramics; Coal, Biomass and Alternative Fuels; Controls, Diagnostics and Instrumentation; Environmental and Regulatory Affairs
Conference Proceedings	ASME Turbo Expo 2006: Power for Land, Sea, and Air
Language	English
Publisher Date	2006-05-08
Publisher Place	Barcelona, Spain
Access Restriction	Subscribed
Subject Keyword	Thermal barrier coatings Life extension Operated hot components Photo-stimulated luminescence piezo spectroscopy Non destructive techniques Spectroscopy Blades Spallation (nuclear physics) Luminescence Instrumentation Residual stresses Stress Gas turbines Signals Damage Engineering prototypes Probes Failure
Content Type	Text
Resource Type	Article

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