Lenz Leite, Mateus ; Barroso, Gilvan ; Parchovianský, Milan ; Galusek, Dušan ; Ionescu, Emanuel ; Krenkel, Walter ; Motz, Günter (2017)
Synthesis and characterization of yttrium and ytterbium silicates from their oxides and an oligosilazane by the PDC route for coating applications to protect Si3N4 in hot gas environments.
In: Journal of the European Ceramic Society, 37 (16)
doi: 10.1016/j.jeurceramsoc.2017.04.034
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Environmental barrier coatings are required to protect Si3N4 against hot gas corrosion and enable its application in gas turbines, among which yttrium and ytterbium silicate-coatings stand out. Thus, the polymer-derived ceramic route was used to synthesize these silicates for basic investigations regarding their intrinsic properties from a mixture of Y2O3 or Yb2O3 powders and the oligosilazane Durazane 1800. After pyrolysis above 1200 °C in air, the silicates are predominant phases. The corrosion behaviour of the resulting composites was tested at 1400 °C for 80 h in moist environments. The material containing x2-Yb2SiO5 and Yb2Si2O7 undergoes the lowest corrosion rate (−1.8 μg cm−2 h−1). Finally, the processing of Y2O3/Durazane 1800 as well-adherent, crack-free and thick (40 μm) coatings for Si3N4 was achieved after pyrolysis at 1400 °C in air. The coating consisted of an Y2O3/Y2SiO5 top-layer and an Y2O3/Y2Si2O7 interlayer due to the interaction of the coating system with the substrate.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Lenz Leite, Mateus ; Barroso, Gilvan ; Parchovianský, Milan ; Galusek, Dušan ; Ionescu, Emanuel ; Krenkel, Walter ; Motz, Günter |
| Art des Eintrags: | Bibliographie |
| Titel: | Synthesis and characterization of yttrium and ytterbium silicates from their oxides and an oligosilazane by the PDC route for coating applications to protect Si3N4 in hot gas environments |
| Sprache: | Englisch |
| Publikationsjahr: | Dezember 2017 |
| Verlag: | Elsevier Science Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 37 |
| (Heft-)Nummer: | 16 |
| DOI: | 10.1016/j.jeurceramsoc.2017.04.034 |
| URL / URN: | https://doi.org/10.1016/j.jeurceramsoc.2017.04.034 |
| Kurzbeschreibung (Abstract): | Environmental barrier coatings are required to protect Si3N4 against hot gas corrosion and enable its application in gas turbines, among which yttrium and ytterbium silicate-coatings stand out. Thus, the polymer-derived ceramic route was used to synthesize these silicates for basic investigations regarding their intrinsic properties from a mixture of Y2O3 or Yb2O3 powders and the oligosilazane Durazane 1800. After pyrolysis above 1200 °C in air, the silicates are predominant phases. The corrosion behaviour of the resulting composites was tested at 1400 °C for 80 h in moist environments. The material containing x2-Yb2SiO5 and Yb2Si2O7 undergoes the lowest corrosion rate (−1.8 μg cm−2 h−1). Finally, the processing of Y2O3/Durazane 1800 as well-adherent, crack-free and thick (40 μm) coatings for Si3N4 was achieved after pyrolysis at 1400 °C in air. The coating consisted of an Y2O3/Y2SiO5 top-layer and an Y2O3/Y2Si2O7 interlayer due to the interaction of the coating system with the substrate. |
| Freie Schlagworte: | Silazane, Rare-earth silicates, Polymer-derived ceramic, Environmental barrier coating, Hot gas corrosion |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe |
| Hinterlegungsdatum: | 15 Jan 2018 08:54 |
| Letzte Änderung: | 30 Jul 2018 05:45 |
| PPN: | |
| Sponsoren: | The authors acknowledge the Alexander von Humboldt Foundation (AvH) within the Research Group Linkage Programme for the financial support that enabled the exchange of students between the University Bayreuth and the Alexander Dubček University Trenčin. |
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