Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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α-case Interfacial Reaction Behavior of Al2O3 Mold Containing Interstitial and Substitutional Compounds for Titanium Investment Casting

침입형 및 치환형 화합물을 함유한 Ti 정밀주조용 Al2O3 주형의 α-case 계면반응 거동

  • Choi, Bong-Jae (Sungkyunkwan University, School of Advanced Materials Science and Engineering) ;
  • Lee, Seul (Sungkyunkwan University, School of Advanced Materials Science and Engineering) ;
  • Kim, Young-Jig (Sungkyunkwan University, School of Advanced Materials Science and Engineering)
  • 최봉재 (성균관대학교 신소재공학과) ;
  • 이슬 (성균관대학교 신소재공학과) ;
  • 김영직 (성균관대학교 신소재공학과)
  • Received : 2011.04.13
  • Published : 2011.07.25
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Abstract

The newly developed ${\alpha}-case$ controlled mold material for Ti investment castings was suggested in this research. The $Al_2O_3$ mold containing interstitial $TiO_2$ and substitutional $Ti_3Al$ was manufactured by the reaction between $Al_2O_3$ and Ti. It is obvious that as the $TiO_2$ and $Ti_3Al$ content in the mold surface were increased, the depth of the interfacial reaction was significantly reduced. In addition, substitutional $Ti_5Si_3$ in the mold surface owing to the reaction between Ti and $SiO_2$ from the binder was effective for ${\alpha}-case$ reduction. Therefore, the ${\alpha}-case$ reduction was accomplished by the diffusion barrier effect of interstitial $TiO_2$, substitutional $Ti_3Al$ and $Ti_5Si_3$.

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