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Environmental stability of the YSZ layer and the YSZ/TGO interface of an in-service EB-PVD coated high-pressure turbine blade

Braue, Wolfgang (2009) Environmental stability of the YSZ layer and the YSZ/TGO interface of an in-service EB-PVD coated high-pressure turbine blade. Journal of Materials Science, 44, pp. 1664-1675. Springer. DOI: 10.1007/s10853-008-3215-8

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Abstract

Hot corrosion of an in-service EB-PVD coated 1st stage high-pressure turbine (HPT) blade following an interactive CaSO4 infiltration/CMAS deposition process has produced reactive interfaces with the YSZ top coat and the TGO layer which were investigated by analytical scanning and transmission electron microscopy. Despite complete CaSO4 infiltration of the coating prior to CMAS deposition, spallation and macroscopic hardware damage were confined to the pressure surface close to the trailing edge. Due to the high lime-to-silica-ratio imposed by the CMAS deposits reaction zones along CaSO4/CMAS/YSZ interfaces typically consisted of a CaZrO3 layer and fine-grained Ca-FSZ particles enveloping rounded YSZ column tips. No interfacial reaction was observed between the YSZ column walls and the CaSO4 pore filling Possible terms for the formation of the unique CaSO4/CMAS microstructure are evaluated. Zirconia destabilization upon hot corrosion is discussed in the light of phase compatibilities in the systems CaO-Y2O3-ZrO2 and CaO-ZrO2-SiO2 and put into perspective with previous work on both, natural and synthetic hot corrosion deposits.

Item URL in elib:https://elib.dlr.de/60222/
Document Type:Article
Title:Environmental stability of the YSZ layer and the YSZ/TGO interface of an in-service EB-PVD coated high-pressure turbine blade
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Braue, WolfgangDLRUNSPECIFIED
Date:2009
Journal or Publication Title:Journal of Materials Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:44
DOI :10.1007/s10853-008-3215-8
Page Range:pp. 1664-1675
Publisher:Springer
Series Name:Interface Science in Thermal Barrier Coatings
Status:Published
Keywords:CMAS-type hot corrosion, engine hardware, electron micoroscopy
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
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 > Structural and Functional Ceramics
Deposited By: Braue, Dr. Wolfgang
Deposited On:05 Nov 2009 16:24
Last Modified:06 Sep 2019 15:27

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