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CMAS attack – a limiting factor for the application of thermal and environmental barrier coatings

Mechnich, Peter (2018) CMAS attack – a limiting factor for the application of thermal and environmental barrier coatings. 12th International Conferenec on Ceramic Materials and Components for Energy and Environmental Applications (CMCEE 2018), 22.-27.7. 2018, Singapur.

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Abstract

Hot-gas exposed gas turbine components typically are made of Ni-based superalloys with ZrO2 thermal barrier coatings (TBC). In operation TBC experience severe degradation by airborne inorganic particles commonly referred to as CMAS (CaO-MgO-Al2O2-SiO2). CMAS particle ingestion, deposition, and subsequent melt infiltration is a major reason for premature TBC failure. Advanced TBC as well as new ceramic matrix composites (CMC) protected by environmental barrier coatings (EBC) promise higher efficiency due to higher operation temperatures. Increasing operation temperatures, however, will aggravate the CMAS problem since particles are expected to impinge on TBC/EBC in a fully molten and highly reactive state. Therefore, the development of new TBC as well as EBC materials with superior CMAS resistance is mandatory. A promising way to tackle CMAS attack is the use of highly reactive TBC/EBC materials which can trigger rapid crystallization of CMAS melts, thus mitigating melt infiltration. A variety of new TBC/EBC materials such as rare-earth element rich zirconates and silicates exhibit such promising resistance against simplified CMAS compositions. However, partial melting of more complex CMAS compositions as well as de-composition of crystalline reaction products of CMAS and TBC/EBC materials can lead to complex recession scenarios and may eventually limit operation temperatures.

Item URL in elib:https://elib.dlr.de/122741/
Document Type:Conference or Workshop Item (Speech)
Title:CMAS attack – a limiting factor for the application of thermal and environmental barrier coatings
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:CMAS Attach, TBC, EBC
Event Title:12th International Conferenec on Ceramic Materials and Components for Energy and Environmental Applications (CMCEE 2018)
Event Location:Singapur
Event Type:international Conference
Event Dates:22.-27.7. 2018
Organizer:Singapore National Institution of Engineers, National University of Singpore
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 11:37
Last Modified:19 Nov 2018 12:15

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