0

Full Content is available to subscribers

Subscribe/Learn More  >

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

[+] Author Affiliations
Letizia De Maria, Claudia Rinaldi

CESI Ricerca, Milano, Italy

Piero Lupetin, Valter Sergo

University of Trieste, Trieste, Italy

Paper No. GT2006-90551, pp. 647-654; 8 pages
doi:10.1115/GT2006-90551
From:
  • 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
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 0-7918-4237-1 | eISBN: 0-7918-3774-2
  • Copyright © 2006 by ASME

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.

Copyright © 2006 by ASME
Topics: Blades

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In