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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. TMS 2009, 15.-19. Febr. 2009, San Francisco, USA.

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Abstract

Due to much lower density and excellent mechanical properties γ-TiAl alloys are promising candidates to replace the heavy steels and Ni-based superalloys typically applied in the field of aerospace and automotive industry. Protective coatings are necessary to exploit the full potential of γ-TiAl at temperatures higher than 750°C; however, so far no coating system tested has proven sufficient performance for long-term use. The paper is focused on the development of Pt-based coatings produced by magnetron sputtering. Two Pt containing systems with different aluminum contents - PtAl and PtAl2 - were investigated aiming at the formation of a slow growing and protective Al2O3 scale. 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 pure Pt deposited on γ-TiAl. 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/59968/
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:February 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:TMS 2009
Event Location:San Francisco, USA
Event Type:Conference
Event Dates:15.-19. Febr. 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 16:04
Last Modified:28 Sep 2009 16:04

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