Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Oxidation of Cr2AlC Carbides at 700-1000℃ in Air

Cr2AlC 탄화물의 700-1000℃에서의 대기중 산화

  • Won, Sung Bin (School of Advanced Materials Science & Engineering, Sungkyunkwan University) ;
  • Hwang, Yeon Sang (School of Advanced Materials Science & Engineering, Sungkyunkwan University) ;
  • Lee, Dong Bok (School of Advanced Materials Science & Engineering, Sungkyunkwan University)
  • 원성빈 (성균관대학교 신소재공학부) ;
  • 황연상 (성균관대학교 신소재공학부) ;
  • 이동복 (성균관대학교 신소재공학부)
  • Received : 2014.04.10
  • Accepted : 2014.04.20
  • Published : 2014.04.30
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Abstract

The $Cr_2AlC$ carbides oxidized at 700, 850 and $1000^{\circ}C$ in air from 70 hours up to 360 days. They oxidized according to the reaction; $Cr_2AlC+O_2{\rightarrow}{\alpha}-Al_2O_3+CO(g)$. The scales consisted primarily of the thin, essentially pure $Al_2O_3$ layer and the underlying Al-dissolved $Cr_7C_3$ layer. They grew via the outward diffusion of Al and carbon, and the inward diffusion of oxygen. The oxidation resistance of $Cr_2AlC$ was excellent due to the formation of the protective $Al_2O_3$ layer. Even when $Cr_2AlC$ oxidized at $1000^{\circ}C$ for 360 days, the ${\alpha}-Al_2O_3$ layer was only about 4 ${\mu}m$-thick.

Keywords

References

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