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Oxidation Protective Coatings for γ-TiAl – Recent Trends

Fröhlich, Maik and Ebach-Stahl, Andrea and Braun, Reinhold and Leyens, Christoph (2007) Oxidation Protective Coatings for γ-TiAl – Recent Trends. Materialwissenschaft und Werkstofftechnik, 38 (9), pp. 667-673. Wiley VCH. doi: 10.1002/mawe.200700183.

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Engine designers show continued interest in γ-TiAl based titanium aluminides as light–weight structural materials to be used at moderately elevated temperatures. Although alloy development has made significant progress in terms of mechanical properties and environmental resistance, protective coatings have been developed that help to extend the lifetime of these alloys significantly. The major challenge of coating development is to prevent the formation of fast growing titania. Furthermore, changes of coating chemistries at high temperatures have to be considered in order to avoid rapid degradation of the coatings due to interdiffusion between substrate and coating. The paper describes recent work of the authors on different coatings produced by means of magnetron sputter technique. Thin ceramic Ti-Al-Cr-Y-N layers tested at 900°C exhibited poor oxidation resistance. In contrast, intermetallic Ti-Al-Cr, Si-based and aluminum rich Ti-Al coatings were tested at exposure temperatures up to 950°C for 1000h resulting in reasonable and partially excellent oxidation behaviour.

Item URL in elib:https://elib.dlr.de/47322/
Document Type:Article
Title:Oxidation Protective Coatings for γ-TiAl – Recent Trends
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Leyens, ChristophBrandenburgische Technische Universität Cottbus, Konrad-Wachsmann-Allee 1, 03046 CottbusUNSPECIFIED
Date:September 2007
Journal or Publication Title:Materialwissenschaft und Werkstofftechnik
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1002/mawe.200700183
Page Range:pp. 667-673
Publisher:Wiley VCH
Series Name:Materials Science and Engineering Technology
Keywords:Oxidationsschutzschichten, TiAl, Hochtemperaturschutz
HGF - Research field:Aeronautics, Space and Transport (old)
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:16 Nov 2007
Last Modified:27 Apr 2009 13:31

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