Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Simultaneous Refinement of Primary and Eutectic Si in Hypereutectic Al-Si Alloys

과공정 Al-Si합금에서의 초정 및 공정 Si의 동시 미세화

  • Park, Jae-Young (Dept. of Metallurgical Engr. Seoul National University) ;
  • Lee, Jae-Sang (Dept. of Metallurgical Engr. Seoul National University) ;
  • Ra, Hyung-Yong (Dept. of Metallurgical Engr. Seoul National University)
  • 박재영 (서울대학교 금속공학과) ;
  • 이재상 (서울대학교 금속공학과) ;
  • 나형용 (서울대학교 금속공학과)
  • Published : 1995.06.20
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Abstract

It is well known what is impossible to refine primary and eutectic Si simultaneously by addition of both Cu-P and Sr(or Na). Because of the formation of compound $Sr_3P_2(or Na_3P)$ in the melt, in the result, both effects disappear. In this study Al-Cu-P alloy that comprises AlP compounds inside is added in the melt with Sr simultaneously. As AlP compounds that act on nucleation sites of primary Si are not formed but added directly an the melt, it is difficult to form $Sr_3P_2$ by reaction with Sr. Therefore it is possible to refine primary and eutectic Si simultaneously in the general casting process by use of Al-Cu-P alloy and Sr.

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