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Ti-Al-Cr based Coatings for High Temperature Oxidation Protection of γ-TiAl

Fröhlich, Maik and Braun, Reinhold and Leyens, Christoph (2009) Ti-Al-Cr based Coatings for High Temperature Oxidation Protection of γ-TiAl. Thermec 2009, 25.-29. Aug. 2009, Berlin.

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Abstract

To extend the oxidation resistance of gamma titanium aluminides for applications above 750°C the formation of non-protective titanium oxide has to be prevented. The primary objective to improve the resistance of titanium aluminides against oxidation is the use of alumina forming coatings. The paper is focussed on the development of oxidation resistant intermetallic coatings on the basis of Ti-Al-Cr. Ti-Al-Cr and Ti-Al-Cr-X coatings with X=Ag,Hf,Y,Si,Zr and W were produced by magnetron sputtering techniques. The coated specimens were exposed to air under cyclic conditions at 950°C and 1000°C for 1000 cycles or until failure, respectively. All coatings formed a thin alumina layer on top providing a diffusion barrier for oxygen at the beginning. But interdiffusion between substrate and Ti-Al-Cr coating leads to a depletion of Laves phase which promotes the formation of alumina. The effect of interdiffusion between coating and substrate for the various coating chemistries and the significance of each quaternary element will be discussed on the basis of post-oxidation SEM/EDX and oxidation kinetics analysis.

Item URL in elib:https://elib.dlr.de/59965/
Document Type:Conference or Workshop Item (Speech)
Title:Ti-Al-Cr based Coatings for High Temperature Oxidation Protection of γ-TiAl
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fröhlich, Maikmaik.froehlich (at) dlr.deUNSPECIFIED
Braun, ReinholdUNSPECIFIEDUNSPECIFIED
Leyens, ChristophBrandenburgische Technische Universität Cottbus, Konrad-Wachsmann-Allee 16, 03046 CottbusUNSPECIFIED
Date:2009
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Oxidation, Oxidationsschutzschichten, γ-TiAl
Event Title:Thermec 2009
Event Location:Berlin
Event Type:Conference
Event Dates:25.-29. Aug. 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 16:08
Last Modified:28 Sep 2009 16:08

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