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Investigations on the oxidation behaviour of MAX-phase based coatings on gamma-TiAl

Fröhlich, Maik (2010) Investigations on the oxidation behaviour of MAX-phase based coatings on gamma-TiAl. 34th International Conference on Advanced Ceramics and Composites, 24.-29. Jan. 2010, Daytona Beach, USA. (Unpublished)

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Abstract

In this study the oxidation resistant and MAX-phase based material Ti<sub>2</sub>AlC was investigated as coating material on the γ-TiAl based high temperature alloy Ti-45Al-8Nb regarding the improvement of the oxidation behaviour. The 10 µm thick layer was deposited by low temperature magnetron sputtering. Phase formation was enhanced after the deposition process by heat treatment at 1000°C under high vacuum conditions (10<sup>-6</sup> mbar). The Ti<sub>2</sub>AlC MAX-phase should intend the formation of a slow growing and protective Al<sub>2</sub>O<sub>3</sub> scale when exposed to air at 950°C as well known for the base material. But the results show that the pre-treated coating system oxidized as fast as the non-pre-treated system. The coatings failed after 40 and 60 1h-cycles by spallation. SEM and EDS analysis after exposure exhibited the growth of a thick mixed oxide scale on top of the annealed MAX-phase coating. Additionally, zones of enrichment as well as depletion of Al, Ti and Nb formed at the substrate/coating interface indicating enhanced diffusion processes within the Ti<sub>2</sub>AlC layer, presumably leading to fast oxidation.

Item URL in elib:https://elib.dlr.de/65069/
Document Type:Conference or Workshop Item (Speech)
Title:Investigations on the oxidation behaviour of MAX-phase based coatings on gamma-TiAl
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fröhlich, MaikUNSPECIFIEDUNSPECIFIED
Date:2010
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Unpublished
Keywords:MAX-phase, oxidation, TiAl
Event Title:34th International Conference on Advanced Ceramics and Composites
Event Location:Daytona Beach, USA
Event Type:international Conference
Event Dates:24.-29. Jan. 2010
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 17:04
Last Modified:24 Aug 2010 17:04

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