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High-temperature corrosion of EB-PVD yttria partially stabilized zirconia thermal barrier coatings with an artificial volcanic ash overlay

Mechnich, Peter and Braue, Wolfgang and Schulz, Uwe (2011) High-temperature corrosion of EB-PVD yttria partially stabilized zirconia thermal barrier coatings with an artificial volcanic ash overlay. Journal of the American Ceramic Society, 94 (3), pp. 925-931. Wiley. DOI: 10.1111/j.1551-2916.2010.04166.x

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Abstract

High-temperature interaction of a sol-gel derived artificial volcanic ash (AVA) matching the bulk composition of the April 15, 2010 Eyjafjallajokull (Iceland) volcanic eruption with a standard 4 mol-% (7 wt-%) Y2O3-stabilized ZrO2 (YSZ) EB-PVD thermal barrier coating and a corresponding YSZ powder is investigated in order to access possible implications of similar volcanic ashes on the performance of coated turbine engine airfoils. Up to 900°C AVA deposits and EB-PVD YSZ do not show significant interaction. Viscous flow above the glass transition of AVA (Tg ~ 930 °C) yields proceeding wetting of EB-PVD YSZ coatings. At 1100 °C, the YSZ surface is covered by a dense glaze-like AVA overlay. At 1200 °C AVA is mostly infiltrating the coating, leaving a crystalline plagioclase- and hematite-type residue at the interface. Moreover, some ZrSiO4 is formed at the expense of YSZ. The overall thermochemical effects upon short-term exposure of the EB-PVD YSZ coating to a small AVA load were moderate, in particular prior to complete infiltration. On the other hand, AVA acts as a solvent for the stabilizing Y2O3 beyond 1000 °C and a progressive depletion of Y2O3 in the YSZ is observed at the AVA / YSZ interface. Detrimental effects on YSZ phase stability and hence coating lifetime cannot be ruled out for long-term exposure and higher AVA loads.

Item URL in elib:https://elib.dlr.de/69295/
Document Type:Article
Title:High-temperature corrosion of EB-PVD yttria partially stabilized zirconia thermal barrier coatings with an artificial volcanic ash overlay
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mechnich, Peterpeter.mechnich (at) dlr.deUNSPECIFIED
Braue, Wolfgangwolfgang.braue (at) dlr.deUNSPECIFIED
Schulz, Uweuwe.schulz (at) dlr.deUNSPECIFIED
Date:March 2011
Journal or Publication Title:Journal of the American Ceramic Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:94
DOI :10.1111/j.1551-2916.2010.04166.x
Page Range:pp. 925-931
Publisher:Wiley
Status:Published
Keywords:YSZ, Thermal Barrier Coating, Volcanic Ash,Corrosion
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: Mechnich, Dr.rer.nat. Peter
Deposited On:28 Mar 2011 12:11
Last Modified:08 Mar 2018 18:45

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