Mechnich, Peter und Braue, Wolfgang und 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), Seiten 925-931. Wiley. doi: 10.1111/j.1551-2916.2010.04166.x.
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Kurzfassung
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.
elib-URL des Eintrags: | https://elib.dlr.de/69295/ | ||||||||||||||||
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Dokumentart: | Zeitschriftenbeitrag | ||||||||||||||||
Titel: | High-temperature corrosion of EB-PVD yttria partially stabilized zirconia thermal barrier coatings with an artificial volcanic ash overlay | ||||||||||||||||
Autoren: |
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Datum: | März 2011 | ||||||||||||||||
Erschienen in: | Journal of the American Ceramic Society | ||||||||||||||||
Referierte Publikation: | Ja | ||||||||||||||||
Open Access: | Nein | ||||||||||||||||
Gold Open Access: | Nein | ||||||||||||||||
In SCOPUS: | Ja | ||||||||||||||||
In ISI Web of Science: | Ja | ||||||||||||||||
Band: | 94 | ||||||||||||||||
DOI: | 10.1111/j.1551-2916.2010.04166.x | ||||||||||||||||
Seitenbereich: | Seiten 925-931 | ||||||||||||||||
Verlag: | Wiley | ||||||||||||||||
Status: | veröffentlicht | ||||||||||||||||
Stichwörter: | YSZ, Thermal Barrier Coating, Volcanic Ash,Corrosion | ||||||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||||||
HGF - Programmthema: | Antriebe (alt) | ||||||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||||||
DLR - Forschungsgebiet: | L ER - Antriebsforschung | ||||||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Brennkammertechnologien (alt) | ||||||||||||||||
Standort: | Köln-Porz | ||||||||||||||||
Institute & Einrichtungen: | Institut für Werkstoff-Forschung > Keramische Struktur- und Funktionswerkstoffe | ||||||||||||||||
Hinterlegt von: | Mechnich, Dr.rer.nat. Peter | ||||||||||||||||
Hinterlegt am: | 28 Mär 2011 12:11 | ||||||||||||||||
Letzte Änderung: | 08 Mär 2018 18:45 |
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