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Oxidation study of Pt–Al based coatings on γ-TiAl at 950 °C

Ebach-Stahl, Andrea and Fröhlich, Maik (2016) Oxidation study of Pt–Al based coatings on γ-TiAl at 950 °C. Surface and Coatings Technology (287), pp. 20-24. Elsevier. DOI: 10.1016/j.surfcoat.2015.12.043 ISSN 0257-8972

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Official URL: http://dx.doi.org/10.1016/j.surfcoat.2015.12.043

Abstract

In the present study, Pt-based aluminide coatings were deposited on γ-TiAl (Ti–45Al–8Nb–08C; at.%) by magnetron sputtering and tested under high temperature conditions. The Pt-content in the layer was varied (31, 47 and 100 at.%) to find an optimized oxidation resistant coating. The Pt-53Al coating showed the best oxidation resistance at 950 °C due to the formation of a continuous thin alumina layer on top compared to the fast oxidizing pure Pt and aluminum rich Pt–69Al coatings. Depending on the testing time different Pt–Ti–Al phases were formed below the grown oxide layer which is caused by the outward diffusion of Ti and the inward diffusion of Pt at the interface between coating and base material, respectively. Beside mass gain measurements microstructural examinations were performed via scanning electron microscopy (SEM), energy-dispersive X-Ray spectroscopy (EDS) as well as X-Ray diffractometry (XRD) to study the evolution of phase formation.

Item URL in elib:https://elib.dlr.de/104129/
Document Type:Article
Title:Oxidation study of Pt–Al based coatings on γ-TiAl at 950 °C
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ebach-Stahl, Andreaandrea.ebach (at) dlr.deUNSPECIFIED
Fröhlich, Maikmaik.froehlich (at) inp-greifswald.deUNSPECIFIED
Date:6 January 2016
Journal or Publication Title:Surface and Coatings Technology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.surfcoat.2015.12.043
Page Range:pp. 20-24
Publisher:Elsevier
ISSN:0257-8972
Status:Published
Keywords:PtAl, γ-TiAl, Oxidation Coating, Magnetron sputtering
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Ebach-Stahl, Andrea
Deposited On:02 Mar 2018 12:30
Last Modified:31 Jul 2019 20:01

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