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URN to cite this document: urn:nbn:de:bvb:703-epub-8880-8
Title data
Titov, Dmitrii ; Awin, Eranezhuth Wasan ; Schafföner, Stefan ; Motz, Günter:
Ytterbium silicate-based environmental barrier coatings with hafnia via polymer-derived ceramic technology.
In: Journal of the European Ceramic Society.
Vol. 46
(2026)
Issue 4
.
- 117932.
ISSN 0955-2219
DOI der Verlagsversion: https://doi.org/10.1016/j.jeurceramsoc.2025.117932
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Project information
| Project title: |
Project's official title Project's id Entwicklung heißgaskorrosionsbeständiger Schutzschichtsysteme auf nichtoxidischen Si basierten Keramiken für Turbinenanwendungen 453000562 Open Access Publizieren No information |
|---|---|
| Project financing: |
Deutsche Forschungsgemeinschaft |
Abstract
Environmental barrier coatings (EBC) are essential to protect silicon nitride (Si3N4) from hot gas corrosion, enabling the utilization of Si3N4 in gas turbines. Otherwise the initially formed silica (SiO2) layer degrades through reactions with the water vapor from fuel combustion. Therefore, hafnia (HfO2) as doping additive in combination with ytterbium silicates was used to reduce the growth rate of silica and to enhance adhesion of EBCs without a bond coat. Finally, a uniform and gradient coating was generated in one stage, applied via spraying and sedimentation of a respective slurry. The in situ formed composite gradient coatings composed of HfO2-Yb2SiO5/Yb2Si2O7-Si3N4 without Si bond coat, exhibited excellent adhesion (42.6 ± 6.4 MPa) and high microhardness (up to 4.3 ± 0.4 GPa). The durability of these coatings was confirmed through more than 20 thermal cycling tests in the temperature range of 1200–20 °C, in which self-healing ability of cracks was proven.
Further data
| Item Type: | Article in a journal |
|---|---|
| Keywords: | Environmental barrier coatings; Polymer-derived ceramics; Rare-earth silicates; Silazanes; Silicon nitride; Self-healing coatings; Thermally grown oxide |
| DDC Subjects: | 600 Technology, medicine, applied sciences > 620 Engineering |
| Institutions of the University: | Faculties > Faculty of Engineering Science > Chair Ceramic Materials > Chair Ceramic Materials - Univ.-Prof. Dr.-Ing. Stefan Schafföner Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Ceramic Materials |
| Language: | English |
| Originates at UBT: | Yes |
| URN: | urn:nbn:de:bvb:703-epub-8880-8 |
| Date Deposited: | 10 Feb 2026 15:45 |
| Last Modified: | 10 Feb 2026 15:46 |
| URI: | https://epub.uni-bayreuth.de/id/eprint/8880 |
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