Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Oxidation of CVD β-SiC in Impurity-Controlled Helium Environment at 950℃

950℃ 불순물을 포함한 헬륨 환경에서 CVD β-SiC의 산화

  • Kim, Dae-Jong (Department of Nuclear Materials Development, Korea Atomic Energy Research Institute) ;
  • Kim, Weon-Ju (Department of Nuclear Materials Development, Korea Atomic Energy Research Institute) ;
  • Jang, Ji-Eun (Department of Materials Engineering, College of Engineering, Chungnam National University) ;
  • Yoon, Soon-Gil (Department of Materials Engineering, College of Engineering, Chungnam National University) ;
  • Kim, Dong-Jin (Department of Nuclear Materials Development, Korea Atomic Energy Research Institute) ;
  • Park, Ji-Yeon (Department of Nuclear Materials Development, Korea Atomic Energy Research Institute)
  • 김대종 (한국원자력연구원 원자력재료개발부) ;
  • 김원주 (한국원자력연구원 원자력재료개발부) ;
  • 장지은 (충남대학교 재료공학과) ;
  • 윤순길 (충남대학교 재료공학과) ;
  • 김동진 (한국원자력연구원 원자력재료개발부) ;
  • 박지연 (한국원자력연구원 원자력재료개발부)
  • Received : 2011.09.01
  • Accepted : 2011.09.07
  • Published : 2011.09.30
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Abstract

The oxidation behavior of CVD ${\beta}$-SiC was investigated for Very High Temperature Gas-Cooled Reactor (VHTR) applications. This study focused on the surface analysis of the oxidized CVD ${\beta}$-SiC to observe the effect of impurity gases on active/passive oxidation. Oxidation test was carried out at $950^{\circ}C$ in the impurity-controlled helium environment that contained $H_2$, $H_2O$, CO, and $CH_4$ in order to simulate VHTR coolant chemistry. For 250 h of exposure to the helium, weight changes were barely measurable when $H_2O$ in the bulk gas was carefully controlled between 0.02 and 0.1 Pa. Surface morphology also did not change based on AFM observation. However, XPS analysis results indicated that a very small amount of $SiO_2$ was formed by the reaction of SiC with $H_2O$ at the initial stage of oxidation when $H_2O$ partial pressure in the CVD ${\beta}$-SiC surface placed on the passive oxidation region. As the oxidation progressed, $H_2O$ consumed and its partial pressure in the surface decreased to the active/passive oxidation transition region. At the steady state, more oxidation did not observable up to 250 h of exposure.

Keywords

References

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