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Oxidation resistant coatings in combination with thermal barrier coatings on γ-TiAl alloys for high temperature applications

Fröhlich, Maik and Braun, Reinhold and Leyens, Christoph (2006) Oxidation resistant coatings in combination with thermal barrier coatings on γ-TiAl alloys for high temperature applications. Surface and Coatings Technology, 201 (7), pp. 3911-3917. ISSN 0257-8972

Full text not available from this repository.

Official URL: http://dx.doi.org/10.1016/j.surfcoat.2006.07.248

Abstract

Providing attractive properties such as low density, high specific stiffness, high specific yield strength and good creep resistance up to high temperatures, γ-TiAl alloys are considered for applications in automotive, aircraft, aerospace as well as in power generation industry with the potential to replace the presently used heavy steels and nickel-based superalloys. To extend the oxidation resistance granted up to 750°C of bare γ-TiAl, protective coatings are under development. A novel approach is the use of thermal barrier coatings (TBCs) on γ-TiAl, typically applied to nickel-based superalloys. This allows to reduce the metal surface temperatures in combination with component cooling for use at even higher temperatures. The paper is focussed on both development of oxidation resistant coatings as well as thermal barrier coatings for gamma titanium aluminides. Ti-Al-Cr-Y nitride and metallic overlay coatings based on Ti-Al-Cr were produced by magnetron sputtering techniques. Both coatings provide excellent oxidation protection for γ-TiAl alloys in air at 750°C. EB-PVD partially-yttria-stabilized zirconia TBCs were deposited onto Ti-45Al-8Nb, either pre-oxidized or coated with various "bond coats" mentioned above. The specimens were examined under cyclic conditions at 900°C and 950°C, respectively. In comparison with base alloy oxidation the nitride coating reveals poor oxidation resistance when exposed at 900°C for 420 cycles whereas the Ti-Al-Cr layer shows moderate oxidation behaviour under these conditions up to 1000 cycles. Furthermore, the effect of several TBC deposition temperatures, 850°C and 950°C, in combination with oxidation resistant coatings was examined.

Item URL in elib:https://elib.dlr.de/45526/
Document Type:Article
Title:Oxidation resistant coatings in combination with thermal barrier coatings on γ-TiAl alloys for high temperature applications
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Fröhlich, MaikUNSPECIFIEDUNSPECIFIED
Braun, ReinholdUNSPECIFIEDUNSPECIFIED
Leyens, ChristophUNSPECIFIEDUNSPECIFIED
Date:2006
Journal or Publication Title:Surface and Coatings Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:201
Page Range:pp. 3911-3917
ISSN:0257-8972
Status:Published
Keywords:TiAl, Wärmedämmschichten, Oxidationsschutz
HGF - Research field:Aeronautics, Space and Transport (old)
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:30 Nov 2006
Last Modified:27 Apr 2009 13:14

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