Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Oxidation of Hot Pressed Cr2AlC Compounds at 900-1200℃ for Up to 50 Hours in Air

열간 압축법으로 제조된 Cr2AlC 화합물의 900-1200℃, 50시간 동안의 대기중 산화

  • Lee, Dong-Bok (School of Advanced Materials Science & Engineering, Sungkyunkwan University)
  • 이동복 (성균관대학교 신소재공학과)
  • Received : 2011.06.26
  • Accepted : 2011.08.30
  • Published : 2011.08.31
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Abstract

$Cr_2AlC$ compounds were synthesized by hot pressing, and oxidized between 900 and $1200^{\circ}C$ in air for up to 50 hours. They oxidized to a thin $Al_2O_3$ layer containing a small amount of $Cr_2O_3$with the liberation of carbon as CO or $CO_2$ gases. The consumption of Al to form the $Al_2O_3$ layer led to the depletion of Al and enrichment of Cr just below the $Al_2O_3$ layer, resulting in the formation of an underlying $Cr_7C_3$ layer. As the oxidation temperature and time increased, the $Cr_7C_3$ oxide layer and the underlying $Cr_7C_3$ layer thickened. The oxidation resistance of $Cr_2AlC$ was generally good due to the formation of the $Al_2O_3$ barrier layer.

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  1. Oxidation of Cr2AlC Carbides at 700-1000℃ in Air vol.47, pp.2, 2014, https://doi.org/10.5695/JKISE.2014.47.2.093