Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Oxidation Resistance of Al Diffusion Coating Layer on TiAl

TiAl합금의 Al 피복시 Al확산 피복층의 내고온산화성

  • Lee, C.H. (Department of Materials Science and Engineering, Dankook University) ;
  • Choe, J.I. (Department of Materials Science and Engineering, Dankook University)
  • 이철형 (단국대학교 재료공학과) ;
  • 최진일 (단국대학교 재료공학과)
  • Published : 1997.06.30
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Abstract

The effect of variation of pack activators, compositions, temperature and time on the thickness and structure of aluminide coatings formed on the TiAl alloy was studied in one-step packs and two-step packs containing aluminum for the purpose of improvement of oxidation resistance. The thickness of coating layer was increased with increasing $NH_4Cl$ content up to 3wt% and then it was saturated. Oxidation resistance of coating layers carried out at one step pack was superior to that of ones through of two step pack. The improvement of high temperature oxidation resistance was due to the formation of a protective $Al_2O_3$ surface layers and coating the alloys with $TiAl_3$ phase.

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