JOM

, Volume 58, Issue 1, pp 17–21 | Cite as

Recent progress in the coating protection of gamma titanium-aluminides

  • C. Leyens
  • R. Braun
  • M. Fröhlich
  • P. Eh. Hovsepian
Research Summary High-Temperature Protection

Abstract

Engine designers show continued interest in titanium aluminides based on the intermetallic γ-TiAl phase as lightweight structural materials to be used at moderately elevated temperatures. Although alloy development has made significant progress in terms of mechanical properties and environmental resistance, protective coatings have been developed that help to extend the lifetime of these alloys significantly. The major challenge of coating development is long-termstability of aprotective oxide scale that forms during service for which purpose alumina formation is essential. Furthermore, changes of coating chemistries at high temperatures must be controlled to avoid rapid degradation of the coatings due to diffusional losses into the substrate material and vice versa.

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Copyright information

© Minerals, Metals & Materials Society 2006

Authors and Affiliations

  • C. Leyens
    • 1
  • R. Braun
    • 1
  • M. Fröhlich
    • 1
  • P. Eh. Hovsepian
    • 2
  1. 1.the Technical University of Brandenburg at CottbusGermany
  2. 2.the Institute of Materials Research at the German Aerospace Center (DLR)CologneGermany

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