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In Situ Generated Yb₂Si₂O₇ Environmental Barrier Coatings for Protection of Ceramic Components in the Next Generation of Gas Turbines

Title data

Lenz Leite, Mateus ; Degenhardt, Ulrich ; Krenkel, Walter ; Schafföner, Stefan ; Motz, Günter:
In Situ Generated Yb₂Si₂O₇ Environmental Barrier Coatings for Protection of Ceramic Components in the Next Generation of Gas Turbines.
In: Advanced Materials Interfaces. Vol. 9 (2022) Issue 11 . - 2102255.
ISSN 2196-7350
DOI: https://doi.org/10.1002/admi.202102255

Official URL: Volltext

Project information

Project title:
Project's official title
Project's id
Deutsche Forschungsgemeinschaft (Grant Number: 453000562)
No information
Federal Ministry of Germany for Economic Affairs and Energy (Grant Number: ZF4109902AG7)
No information

Project financing: Bundesministerium für Wirtschaft und Technologie
Deutsche Forschungsgemeinschaft

Abstract in another language

In face of an accelerating climate change, the reduction and substitution of fossil fuels is crucial to decarbonize energy production. Gas turbines can operate with versatile fuel sources like natural gas and future fuels such as hydrogen and ammonia. Furthermore, thermal efficiencies above 60% can be achieved using non-oxide silicon-based ceramic components. However, water vapor is one of the main combustion products leading to rapid corrosion because of volatilization of the protective SiO2 layer at 1200 °C. An in situ generated Yb2Si2O7 double layered environmental barrier coating system composed of silazanes and the active fillers Yb2O3 and Si processed at 1415 °C for 5 h in air protects a Si3N4 substrate very effectively from corrosion. It exhibits a dense microstructure with a total thickness of 68 µm, overcomes 15 thermal cycling tests between 1200 and 20 °C and shows almost no mass loss after very harsh hot gas corrosion at 1200 °C for 200 h (pH2O = 0.15 atm, v = 100 m s−1). The excellent adhesion strength (36.9 ± 6.2 MPa), hardness (6.9 ± 1.6 GPa) and scratch resistance (28 N) demonstrate that the coating system is very promising for application in the next generation of gas turbines.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: environmental barrier coating; hot gas corrosion; polymer derived ceramic; rare-earth silicates; silazanes; silicon nitride
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Former Professors
Faculties > Faculty of Engineering Science > Chair Ceramic Materials
Faculties > Faculty of Engineering Science > Former Professors > Chair Ceramic Materials - Univ.-Prof. Dr.-Ing. Walter Krenkel
Faculties > Faculty of Engineering Science > Chair Ceramic Materials > Chair Ceramic Materials - Univ.-Prof. Dr.-Ing. Stefan Schafföner
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 15 Oct 2022 21:00
Last Modified: 31 Mar 2023 09:23
URI: https://eref.uni-bayreuth.de/id/eprint/72442