Oxidation behavior of TiAl/TiAl-SiC gradient coatings on gamma titanium aluminides

  • Gong S
  • Xu H
  • Yu Q
 et al. 
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Gradient TiAl/TiAl + SiC coatings on the gamma titanium aluminide were fabricated by using electron beam physical vapor deposition (EB-PVD) technique, and the oxidation resistance behavior was investigated. The coating surface was in the structure containing mainly TiAl and SiC identified by the X-ray diffractometer. The oxidation resistance depends on the ratio of the surfacial content of SiC to TiAl. Only 1.03 mg/cm2weight gain was recorded after isothermal oxidation at 1173 K in air for 200 h, and no spallation was recognized after cyclic oxidation at 1173 K in air for 100 h for the coating with the ratio of approximately 8:3 TiAl/SiC. The contribution of SiC to the improvement of the oxidation resistance can be considered as the formation of amorphous SiO2. (C) 2000 Elsevier Science S.A. All rights reserved.

Author-supplied keywords

  • Electron beam physical vapor deposition
  • Gradient coatings
  • Oxidation behavior
  • TiAl

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  • Shengkai Gong

  • Huibin Xu

  • Qihui Yu

  • Chungen Zhou

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