Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Corrosive Degradation of MgO/Al2O3-Added Si3N4 Ceramics under a Hydrothermal Condition

MgO/Al2O3가 소결조제로 첨가된 Si3N4 세라믹스의 수열 조건에서의 부식열화 거동

  • Kim, Weon-Ju (Nuclear Materials Research Center, Korea Atomic Energy Research Institute) ;
  • Kang, Seok-Min (Nuclear Materials Research Center, Korea Atomic Energy Research Institute) ;
  • Park, Ji-Yeon (Nuclear Materials Research Center, Korea Atomic Energy Research Institute)
  • 김원주 (한국원자력연구원 원자력재료연구센터) ;
  • 강석민 (한국원자력연구원 원자력재료연구센터) ;
  • 박지연 (한국원자력연구원 원자력재료연구센터)
  • Published : 2007.07.27
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Abstract

Silicon nitride ($Si_3N_4$) ceramics have been considered for various components of nuclear power plants such as the mechanical seal of a reactor coolant pump (RCP), the guide roller for a control rod drive mechanism (CRDM), and a seal support, etc. Corrosion behavior of $Si_3N_4$ ceramics in a high-temperature and high-pressure water must be elucidated before they can be considered as components for nuclear power plants. In this study, the corrosion behaviors of $Si_3N_4$ ceramics containing MgO and $Al_2O_3$ as sintering aids were investigated at a hydrothermal condition ($300^{\circ}C$, 9.0 MPa) in pure water and 35 ppm LiOH solution. The corrosion reactions were controlled by a diffusion of the reactive species and/or products through the corroded layer. The grain-boundary phase was preferentially corroded in pure water whereas the $Si_3N_4$ grain seemed to be corroded at a similar rate to the grain-boundary phase in LiOH solution. Flexural strengths of the $Si_3N_4$ ceramics were significantly degraded due to the corrosion reaction. Results of this study imply that a variation of the sintering aids and/or a control (e.g., crystallization) of the grain-boundary phase are necessary to increase the corrosion resistance of $Si_3N_4$ ceramics in a high-temperature water.

Keywords

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