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Optimizing thermally grown oxide for thermal barrier coatings on TiAl components via fluorine treatment

  • High Temperature Alloys
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Abstract

Titanium aluminides suffer from non-protective mixed-oxide scale formation during high-temperature exposure in oxidizing environments, so that they cannot be used at temperatures above approximately 800° C for longer times without additional treatment. A fluorine treatment on γ-TiAl alloys leads to the formation of a pure protective alumina scale and allows their use at service temperatures above 800°C. This thermally grown aluminum oxide layer can be used for bonding ceramic thermal barrier coatings to the TiAl substrate. Zirconia topcoats deposited by electron-beam physical vapor deposition were very adherent to F-treated TiA samples during cyclic oxidation tests at 900 to 1,000°C. A separate bond coat is not needed in this case.

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Authors and Affiliations

  1. DECHEMA e.V. Karl-Winnacker-lnstitut, D-60486, Frankfurt/Main, Germany

    A. Donchev & M. Schütze

  2. German Aerospace Center, Institute of Materials Research, D-51170, Cologne, Germany

    R. Braun

Authors
  1. A. Donchev
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  2. R. Braun
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  3. M. Schütze
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Correspondence to A. Donchev.

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Donchev, A., Braun, R. & Schütze, M. Optimizing thermally grown oxide for thermal barrier coatings on TiAl components via fluorine treatment. JOM 62, 70–74 (2010). https://doi.org/10.1007/s11837-010-0015-9

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  • DOI: https://doi.org/10.1007/s11837-010-0015-9

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