Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Al addition on Mullitization Behavior of Shell Mold during Sintering

Al 첨가에 따른 소성중 쉘 몰드의 뮬라이트화 거동

  • 김재원 (한국기계연구원 내열재료그룹) ;
  • 김두현 (한국기계연구원 내열재료그룹) ;
  • 서성문 (한국기계연구원 내열재료그룹) ;
  • 조창용 (한국기계연구원 내열재료그룹) ;
  • 김주량 (KPC 기술연구소) ;
  • 최승주 (한국기계연구원 내열재료그룹)
  • Published : 1999.08.01
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Abstract

The efect of A1 addition and sintering condition on mutization behavior between alumina and silica in alumina-based shell mold was investigated. A1 addition and high sintering temperature increased the degree of mullitization between alumina/silica but decreased the room temperature strentgh of the shell molds. It was identified that the sintered strength of the shell molds was in range of 2.0~2.6kg/$\textrm{mm}^2$. Al addition suppressed deflection of the shell molds at high temperature. Especially, no deflection was observed in the specimen which was sintered at $1000^{\circ}C$ for 1hr with 2.5wt% Al. The specimen sintered at $1500^{\circ}C$ for 4hrs with no Al addition also displayed no deflection.

A1 분말의 첨가량을 변화시킨 알루미나 쉘 몰드를 제조하여 소성조건에 따른 알루미나/실리카의 뮬라이트화 거동을 관찰하였다. 알루미나/실리카의 뮬라이트화 반응은 소성온도 및 A1 함량의 증가에 따라 증대함을 알 수 있었으나 쉘 몰드의 상온강도는 감소하였다. 각 소성조건에서 측정된 쉘 강도는 2.0~2.6kg/$\textrm{mm}^2$임을 알 수 있었다. Al의 첨가는 고온에서 쉘 몰드의 변형을 억제시켰다. 특히 2.5wt%%의 Al을 첨가한 후 $1000^{\circ}C$에서 1시간 유지한 시편에서는 변형이 일어나지 않았으며, 또한 Al을 첨가하지 않은 시편을 $1500^{\circ}C$에서 4시간동안 소성한 시편에서도 변형이 일어나지 않음을 알 수 있었다.

Keywords

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