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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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Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/122741/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:CMAS attack – a limiting factor for the application of thermal and environmental barrier coatings
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Mechnich, PeterPeter.Mechnich (at) dlr.dehttps://orcid.org/0000-0003-4689-8197NICHT SPEZIFIZIERT
Datum:2018
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:CMAS Attach, TBC, EBC
Veranstaltungstitel:12th International Conferenec on Ceramic Materials and Components for Energy and Environmental Applications (CMCEE 2018)
Veranstaltungsort:Singapur
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:22.-27.7. 2018
Veranstalter :Singapore National Institution of Engineers, National University of Singpore
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebssysteme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Engine Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Brennkammertechnologien (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Werkstoff-Forschung > Struktur- und Funktionskeramik
Hinterlegt von: Mechnich, Dr.rer.nat. Peter
Hinterlegt am:08 Nov 2018 11:37
Letzte Änderung:29 Mär 2023 00:08

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