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Detrimental effects of sand ingression in jet engine ceramic coatings captured with Raman-based 3D rendering.

Barrett, Chance and Stein, Zachary and Hernandez, J and Naraparaju, Ravisankar and Schulz, Uwe and Tetard, Laurene and Raghavan, Seetha (2020) Detrimental effects of sand ingression in jet engine ceramic coatings captured with Raman-based 3D rendering. Journal of the European Ceramic Society. Elsevier. doi: 10.1016/j.jeurceramsoc.2020.09.050. ISSN 0955-2219.

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Abstract

The infiltration of molten calcium, magnesium, and alumino-silicates (CMAS) into jet engine thermal barrier coatings (TBCs) causes an increased stiffness and a destructive phase destabilization eventually leading to thermomechanical failure. Using 3D confocal Raman spectroscopy, the extent of thermochemical degradation was identified by mapping the monoclinic phase volume fraction (mPVF) throughout a standard EB-PVD 7YSZ TBC coating. The mPVF is characterized as a function of depth and infiltration time with microscale resolution. Results show that phase destabilization was most intense along the column's perimeter whereas the core of the column retained most of its original phase. The greatest amount of phase destabilization occurs within the first hour of the interaction after which the average minimum mPVF is 32%. This value increases to 42% after a ten-fold increase in interaction time. This ability to quantitatively and non-destructively characterize degradation of CMAS infiltrated TBCs will accelerate development of degradation resistant coatings.

Item URL in elib:https://elib.dlr.de/137489/
Document Type:Article
Title:Detrimental effects of sand ingression in jet engine ceramic coatings captured with Raman-based 3D rendering.
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Barrett, ChanceUNSPECIFIEDUNSPECIFIED
Stein, ZacharyUNSPECIFIEDUNSPECIFIED
Hernandez, JUNSPECIFIEDUNSPECIFIED
Naraparaju, RavisankarRavisankar.Naraparaju (at) dlr.deUNSPECIFIED
Schulz, UweUwe.Schulz (at) dlr.dehttps://orcid.org/0000-0003-0362-8103
Tetard, LaureneUNSPECIFIEDUNSPECIFIED
Raghavan, SeethaDepartment of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816,UNSPECIFIED
Date:October 2020
Journal or Publication Title:Journal of the European Ceramic Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.jeurceramsoc.2020.09.050
Publisher:Elsevier
ISSN:0955-2219
Status:Published
Keywords:CMAS, Thermal Barrier Coatings, 7YSZ, Non-Destructive, Confocal Raman Spectroscopy
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 (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Naraparaju, Dr Ravisankar
Deposited On:16 Nov 2020 17:07
Last Modified:16 Nov 2020 17:07

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