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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. Materials Science Forum, 638-642.

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Abstract

In this study the oxidation resistance of Ti-45Al-8Nb (at.%) alloy coated with quaternary Ti-Al-Cr-X layers (X = Si, Hf, Y, Zr and W) was investigated. The Ti-Al-Cr-Si, Ti-Al-Cr-Hf and Ti-Al-Cr-Y coated specimens were exposed to air at 950°C under cyclic conditions, whereas the samples with Ti-Al-Cr-Zr and Ti-Al-Cr-W coatings were thermally cycled at 1000°C. After the maximum exposure time period of 1000 1h-cycles or failure cross-sections of the samples were examined by means of SEM and EDS to analyse the microstructural evolution. At initial stages of exposure, all intermetallic layers formed a thin alumina layer on top, providing a diffusion barrier to oxygen. But interdiffusion between coating and substrate caused depletion of the Ti(Cr,Al)2 Laves phase in the intermetallic layers, which promoted the formation of alumina, as well as transformation into Ti-rich B2-phase. Coarsening of the latter phase beneath the alumina scale resulted in a higher oxidation resistance compared to that of ternary Ti-Al-Cr coating.

Item URL in elib:https://elib.dlr.de/59964/
Document Type:Proceedings
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
Volume:638-642
Number of Pages:1306
Series Name:Materials Science Forum
Status:Published
Keywords:Oxidation, Oxidationsschutzschichten, γ-TiAl
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:24 Aug 2010 17:07
Last Modified:24 Aug 2010 17:07

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