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Resistance of APS Y2O3 EBC against two artificial volcanic ash variants

Mechnich, Peter (2018) Resistance of APS Y2O3 EBC against two artificial volcanic ash variants. 42nd International Conference on Advanced Ceramics & Composites, 21.-26. Januar 2018, Daytona Beach, USA.

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Abstract

Ceramic matrix composites (CMC) are being developed for next generation aero-engines to substitute conventional superalloy components. However, the synergistic attack of increasing operation temperatures and water-rich exhaust gases demands for environmental barrier coatings (EBC) for protecting CMC components against thermochemical degradation. At DLR, a model CMC combustor liner with air-plasma-sprayed (APS) Y2O3 EBC has been demonstrated recently. Beyond heat and water-rich exhaust gases, ingestion and subsequent deposition of inorganic aerosols such volcanic ash (VA) is considered a major issue for EBC lifetime. In particular infiltration of open porosity by molten VA deposits is considered a major reason for “cold shock” fracture and subsequent EBC spallation. The behavior of APS Y2O3 EBC attacked by two test dusts similar to recent volcanic eruptions in Iceland, (Ejafjalla, 2010 and Grimsvotn, 2011), is presented in the light of phase formation, solid solubility, and microstructural evolution. APS Y2O3 EBC exhibit excellent resistance versus both VA-types at temperatures up to 1500°C at minimum. Melt infiltration is effectively mitigated by a low-permeable microstructure and rapid crystallization of Y-rich phases such as oxyapatites and silicates. Therfore, the thermochemical attack is occurring only close to the EBC surface.

Item URL in elib:https://elib.dlr.de/122736/
Document Type:Conference or Workshop Item (Speech)
Title:Resistance of APS Y2O3 EBC against two artificial volcanic ash variants
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Mechnich, PeterPeter.Mechnich (at) dlr.deUNSPECIFIED
Date:2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:EBC, APS Y2O3, Volcanic Ash
Event Title:42nd International Conference on Advanced Ceramics & Composites
Event Location:Daytona Beach, USA
Event Type:international Conference
Event Dates:21.-26. Januar 2018
Organizer:The American Ceramic Society
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 - Combustion Chamber Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Structural and Functional ceramics
Deposited By: Mechnich, Dr.rer.nat. Peter
Deposited On:08 Nov 2018 11:34
Last Modified:19 Nov 2018 12:17

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