Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effects of Sintering Temperature and Atmosphere on Densification of Hypereutectic Al-Si Alloy Powders

Al-20Si-5.5Fe-1.2Mg-0.5Mn 합금분말의 치밀화에 미치는 소결온도와 분위기의 영향

  • Lee, Jae-Wook (Department of Powder Materials Research, Korea Institute of Materials Science) ;
  • Park, Sang-Bin (Department of Powder Materials Research, Korea Institute of Materials Science) ;
  • Yang, Sang-Sun (Department of Powder Materials Research, Korea Institute of Materials Science) ;
  • Kim, Yong-Jin (Department of Powder Materials Research, Korea Institute of Materials Science)
  • 이재욱 (한국기계연구원 부설 재료연구소 분말재료연구부) ;
  • 박상빈 (한국기계연구원 부설 재료연구소 분말재료연구부) ;
  • 양상선 (한국기계연구원 부설 재료연구소 분말재료연구부) ;
  • 김용진 (한국기계연구원 부설 재료연구소 분말재료연구부)
  • Published : 2008.06.28
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Abstract

The densification behavior of Al-20Si-5.5Fe-1.2Mg-0.5Mn powders was investigated through micro-structure analysis of sintered specimens. The specimens sintered in vacuum or in high purity (99.999%) nitrogen showed porous near-surface microstructures. The densification of near-surface part was enhanced by means of ultra-high purity (99.9999%) nitrogen atmosphere. The relationship between slow densification and oxide surfaces of Al alloy powders was discussed. And the effects of Mg addition, nitrogen gas, and humidity on densification were discussed. In addition, the rapid growth of primary Si crystals above the critical temperature was reported.

Keywords

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