Comparison Of Thermal Barrier Coating Stresses Via High Energy X-Rays And Piezospectroscopy

Abstract

Thermal Barrier Coatings (TBC) have been instrumental in advancing the performance and efficiency of turbine engines over the last decades. The use of high temperature ceramics has allowed increased temperatures by way of protecting the load bearing blade substrate and extending its lifetime. Today there continues to exist the need to understand the behavior of the TBC to extend the life and performance of both the TBC and the underlying substrate blades. In this study, the TBC was examined by the use of optical spectroscopy and synchrotron X-Ray di?raction to understand the strain and stress experienced by each of the layers in the coating. Raman and Photoluminescence spectroscopy were employed to examine the thermally grown oxide layer (TGO) and the ceramic top coat and to identify the influence of variations in temperature distribution. X-Ray di?raction measurements were conducted at the Advanced Photon Source, at Argonne National Laboratory allowing the in-situ investigation of variation in loading conditions including a representative flight cycle. A pre-aged specimen was used for di?raction measurements for a more mature oxide layer. Optical spectroscopy measurements provided high resolution stress maps of the oxide scale. The results from this study provide a more complete understanding as to the behavior of the TBC and its development through the lifetime, and can serve to validate and further the development numerical models.

Publication Date

1-1-2015

Publication Title

53rd AIAA Aerospace Sciences Meeting

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.2514/6.2015-0874

Socpus ID

84980316354 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84980316354

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