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Development of Oxidation Protective Coatings for Advanced Aero Engines

Fröhlich, Maik and Ebach-Stahl, Andrea and Braun, Reinhold and Leyens, Christoph (2009) Development of Oxidation Protective Coatings for Advanced Aero Engines. 1st EJC-PISE Workshop, 08.-11. Juni 2009, Riga, Lettland.

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Abstract

The development of novel aero engines mainly aims on more efficient fuel consumption, decrease of the emission of exhaust gases as well as higher propulsive force. New materials are necessary to realize the increasing demands. Engine designers show continued interest in titanium aluminides as lightweight structural materials. With regard to high efficient combustion the components are exposed to higher temperatures, finally leading to material failure in former times due to rapid oxidation. For long term use of lightweight titanium aluminides at temperatures above 750°C coatings are needed to clearly extend the lifetime. The major challenge of the coating development is long-term stability of a protective, slow growing oxide scale that forms during service. Furthermore, changes of coating chemistries at high temperatures must be controlled to avoid rapid degradation of the coatings due to diffusional losses into the substrate material and vice versa. In this study 10 µm thick Pt-based, silicide based as well as Ti-Al-Cr-X coatings were deposited on Ti-45Al-8Nb (at.%) by magnetron sputtering. The oxidation resistance of each coating system was tested under cyclic conditions at 950°C up to 1000 1h-cycles and compared to the oxidation behaviour of uncoated material. Investigations of microstructure evolution will be presented observed by means of SEM and EDS analysis after exposure.

Item URL in elib:https://elib.dlr.de/59967/
Document Type:Conference or Workshop Item (Speech)
Title:Development of Oxidation Protective Coatings for Advanced Aero Engines
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fröhlich, Maikmaik.froehlich (at) dlr.deUNSPECIFIED
Ebach-Stahl, AndreaUNSPECIFIEDUNSPECIFIED
Braun, ReinholdUNSPECIFIEDUNSPECIFIED
Leyens, ChristophBrandenburgische Technische Universität Cottbus, Konrad-Wachsmann-Allee 16, 03046 CottbusUNSPECIFIED
Date:June 2009
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Oxidation, Oxidationsschutzschichten, γ-TiAl, Titanium Aluminides
Event Title:1st EJC-PISE Workshop
Event Location:Riga, Lettland
Event Type:Workshop
Event Dates:08.-11. Juni 2009
HGF - Research field:Energy
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Fröhlich, Maik
Deposited On:28 Sep 2009 16:05
Last Modified:28 Sep 2009 16:05

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