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The CaSO4 phase in fully infiltrated EB-PVD YSZ top coats from engine hardware: formation mechanism, reactive interfaces and damage assessment

Braue, W. and Mechnich, P. and Peters, P. W. M. (2011) The CaSO4 phase in fully infiltrated EB-PVD YSZ top coats from engine hardware: formation mechanism, reactive interfaces and damage assessment. 8th International Conference on the Microscopy of Oxidation, 11. - 13. April 2011, Liverpool, UK.

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Abstract

Abstract TBC recession mechanisms caused by CaSO4 and Fe-Ti-rich CMAS (FTCMAS) particles on an in-service EB-PVD YSZ coated high-pressure turbine blade have been studied using analytical electron microscopy and concomitant laboratory experiments. A vapor phase deposition process is proposed for CaSO4 in order to rationalize the unique microstructure of pure CaSO4 infiltration through the full thickness of the YSZ top coat prior to deposition FTCMAS particles. While no CaSO4/YSZ interaction is observed in the bottom sections of the coating, distinct reactive interfaces develop at the surface due to YSZ interaction with both, CaSO4 and FTCMAS particles at working temperatures. Upon partial dissolution of the YSZ column tips the CaSO4/YSZ interface results in CaZrO3 formation, while the FTCMAS/YSZ interface consists of a thin double layer of CaZrO3 and a garnet-type Ca3Zr2(Fe, Al, Si)3O12 phase, also known as the mineral kimzeyite. Despite CaSO4 infiltration and an accumulated service life time of 17000 hrs. the top coat was still found to be intact. Bond-coat rumpling at the less efficiently cooled regions close to the trailing edge gives rise to strong surface undulations. This effect is particularly pronounced on the pressure surface and yields a crest/trough topography. The well adherent CaZrO3 layer from the CaSO4/YSZ interface may have a similar impact on TBC spallation as a glassy CMAS-type overlay.

Item URL in elib:https://elib.dlr.de/70707/
Document Type:Conference or Workshop Item (Speech)
Title:The CaSO4 phase in fully infiltrated EB-PVD YSZ top coats from engine hardware: formation mechanism, reactive interfaces and damage assessment
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Braue, W.WFUNSPECIFIED
Mechnich, P.WFUNSPECIFIED
Peters, P. W. M. WFUNSPECIFIED
Date:2011
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:EB-PVD YSZ top coats, high-pressure turbine blade, CaSO4/CMAS-type hot corrosion, reactive interfaces
Event Title:8th International Conference on the Microscopy of Oxidation
Event Location:Liverpool, UK
Event Type:international Conference
Event Dates:11. - 13. April 2011
Organizer:The University of Liverpool
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 - Combustion Chamber Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional Ceramics
Deposited By: Braue, Dr. Wolfgang
Deposited On:18 Oct 2011 17:21
Last Modified:18 Oct 2011 17:21

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