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RAMAN STUDIES ON EB-PVD 7%YTTRIA- STABILIZED ZIRCONIA COATINGS WITH CMAS DEPOSITS

Bohoroquez, Estefania and Naraparaju, Ravisankar and Barrett, Chance and Hoover, Ryan and Tetard, Laurene and Schulz, Uwe and Raghavan, Seetha (2018) RAMAN STUDIES ON EB-PVD 7%YTTRIA- STABILIZED ZIRCONIA COATINGS WITH CMAS DEPOSITS. Thermal Barrier Coatings 5, 25-29 th June, Irsee, Germany.

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Abstract

Thermal barrier coatings (TBCs) benefit the performance of turbine blades under operational conditions by successfully maintaining their integrity. However, reduced effectiveness of TBCs is experienced when foreign materials deposit on their surface, specifically those leading to infiltration of siliceous debris and calcium-magnesium-alumina silicate (CMAS) deposits. In this paper, the microstructural properties of Electron Beam Physical Vapor Deposition (EB-PVD) 7%YSZ coatings exposed to CMAS deposits were investigated. Raman spectroscopy was used to track the phase transformation of Zirconia from its tetragonal (t) to its monoclinic phase (m). Our results show that the behavior of the TBCs is location and temperature-dependent. For coatings heated at 1250° C for 10 hours, the YSZ top coat was partially dissolved in the CMAS, resulting in a decreasing monoclinic phase volume faction further into the coating and away from the CMAS infiltrated region. These results suggest that the band corresponding to the monoclinic phase of the material can be used to detect the CMAS within the TBC.

Item URL in elib:https://elib.dlr.de/123674/
Document Type:Conference or Workshop Item (Poster)
Title:RAMAN STUDIES ON EB-PVD 7%YTTRIA- STABILIZED ZIRCONIA COATINGS WITH CMAS DEPOSITS
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bohoroquez, EstefaniaUNSPECIFIEDUNSPECIFIED
Naraparaju, RavisankarRavisankar.Naraparaju (at) dlr.deUNSPECIFIED
Barrett, ChanceUNSPECIFIEDUNSPECIFIED
Hoover, RyanUNSPECIFIEDUNSPECIFIED
Tetard, LaureneUNSPECIFIEDUNSPECIFIED
Schulz, UweUwe.Schulz (at) dlr.dehttps://orcid.org/0000-0003-0362-8103
Raghavan, SeethaUNSPECIFIEDUNSPECIFIED
Date:29 November 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermal barrier coatings (TBCs); Calcium–magnesium–alumina–silicate (CMAS); Microstructure; Raman Spectroscopy
Event Title:Thermal Barrier Coatings 5
Event Location:Irsee, Germany
Event Type:international Conference
Event Dates:25-29 th June
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Naraparaju, Dr Ravisankar
Deposited On:29 Nov 2018 10:08
Last Modified:29 Nov 2018 10:08

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