Investigation Of The Effects Of Cmas-Infiltration In Eb-Pvd 7% Yttria-Stabilized Zirconia Via Raman Spectroscopy

Abstract

Surface contaminants consisting of calcium-magnesium-alumina silicate (CMAS) have proven to negatively impact the thermal and mechanical properties of thermal barrier coatings (TBCs) on turbine blades during engine operation. CMAS particulates react with the ceramic coat, yttria stabilized Zirconia (YSZ), and cause a depletion in yttria content which forces a phase transformation from tetragonal (t) to monoclinic (m). In this study, Raman spectroscopy is used as a nondestructive analysis technique for evaluating YSZ under CMAS attack. 7YSZ layer was infiltrated with CMAS for different times at 1225 and 1250°C. It was found that in areas of greater CMAS infiltration, where samples were heated at higher temperatures, there was an increase in monoclinic peak intensity and width. These results show that monoclinic peak identification is correlated with the CMAS infiltration and can potentially be used to establish the critical depth of infiltration which can significantly affect TBC failure.

Publication Date

1-1-2018

Publication Title

AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference, 2018

Issue

210049

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.2514/6.2018-0096

Socpus ID

85044589530 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85044589530

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