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Steinberg, Lars und Mikulla, Christoph und Naraparaju, Ravisankar und Toma, Filofteia- Laura und Großmann, Holger und Schulz, Uwe und Leyens, C. (2019) Erosion resistance of CMAS infiltrated sacrificial suspension sprayed alumina top layer on EB-PVD 7YSZ coatings. WEAR, 438-39, Seite 203064. Elsevier. doi: 10.1016/j.wear.2019.203064. ISSN 0043-1648.
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Kurzfassung
Abstract The development of CMAS (CaO-MgO-Al2O3-SiO2) -resistant thermal barrier coatings is an urgent issue, as the operating temperatures of aero-engines exceed the melting point of the CMAS. Application of alumina as top layer on 7YSZ coatings has shown promising CMAS resistance behavior. It reacts with the CMAS and crystallizes into new stable phases, which seals the CMAS penetration paths in the top layer to save the underlying 7YSZ layer from infiltration. This paper deals with the study of the erosion behavior of porous thermally sprayed Al2O3 sacrificial layer on top of EB-PVD 7YSZ coatings before and after the CMAS infiltration and investigates the combined erosion/corrosion regime. The TBC system has been infiltrated with three different CMAS compositions having a different Ca/Si ratio which resulted in different reaction scenarios and products. The change in the erosion behavior of the coating system as a function of CMAS infiltration depth was investigated and an erosion model has been proposed. The key factors that dictate the erosion resistance of such alumina layers were found to be the thickness and morphology of the reaction layer, the porosity of the non-reacted alumina layer underneath the reaction layer as well as the coating adhesion mechanism between alumina and 7YSZ.
| elib-URL des Eintrags: | https://elib.dlr.de/130390/ | ||||||||||||||||||||||||||||||||
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| Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||||||||||||||||||
| Titel: | Erosion resistance of CMAS infiltrated sacrificial suspension sprayed alumina top layer on EB-PVD 7YSZ coatings | ||||||||||||||||||||||||||||||||
| Autoren: |
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| Datum: | 20 September 2019 | ||||||||||||||||||||||||||||||||
| Erschienen in: | WEAR | ||||||||||||||||||||||||||||||||
| Referierte Publikation: | Ja | ||||||||||||||||||||||||||||||||
| Open Access: | Ja | ||||||||||||||||||||||||||||||||
| Gold Open Access: | Nein | ||||||||||||||||||||||||||||||||
| In SCOPUS: | Ja | ||||||||||||||||||||||||||||||||
| In ISI Web of Science: | Ja | ||||||||||||||||||||||||||||||||
| Band: | 438-39 | ||||||||||||||||||||||||||||||||
| DOI: | 10.1016/j.wear.2019.203064 | ||||||||||||||||||||||||||||||||
| Seitenbereich: | Seite 203064 | ||||||||||||||||||||||||||||||||
| Verlag: | Elsevier | ||||||||||||||||||||||||||||||||
| ISSN: | 0043-1648 | ||||||||||||||||||||||||||||||||
| Status: | veröffentlicht | ||||||||||||||||||||||||||||||||
| Stichwörter: | TBC; solid particle erosion; CMAS; alumina; suspension plasma spraying; erosion testing | ||||||||||||||||||||||||||||||||
| 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 - Turbinentechnologien (alt) | ||||||||||||||||||||||||||||||||
| Standort: | Köln-Porz | ||||||||||||||||||||||||||||||||
| Institute & Einrichtungen: | Institut für Werkstoff-Forschung > Hochtemperatur-und Funktionsschutzschichten | ||||||||||||||||||||||||||||||||
| Hinterlegt von: | Naraparaju, Dr Ravisankar | ||||||||||||||||||||||||||||||||
| Hinterlegt am: | 11 Nov 2019 18:20 | ||||||||||||||||||||||||||||||||
| Letzte Änderung: | 31 Okt 2023 13:55 |
Verfügbare Versionen dieses Eintrags
- Erosion resistance of CMAS infiltrated sacrificial suspension sprayed alumina top layer on EB-PVD 7YSZ coatings. (deposited 11 Nov 2019 18:20) [Gegenwärtig angezeigt]
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