Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Influence of Bismuth and Antimony Additions on the Structures and Casting Properties of Lead-free Cu-Zn-Sn Bronze Castings

무연 Cu-Zn-Sn 청동의 조직과 주조성에 미치는 Bi 및 Sb 첨가의 영향

  • Park, Heung-Il (Department of Materials System Engineering, Graduate School, Pukyung National University) ;
  • Park, Sung-Ik (Department of Materials System Engineering, Graduate School, Pukyung National University) ;
  • Kim, Sung-Gyu (Department of Materials System Engineering, Graduate School, Pukyung National University)
  • 박흥일 (부경대학교 대학원 신소재시스템공학과) ;
  • 박성익 (부경대학교 대학원 신소재시스템공학과) ;
  • 김성규 (부경대학교 대학원 신소재시스템공학과)
  • Received : 2012.03.05
  • Accepted : 2012.04.09
  • Published : 2012.04.30
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Abstract

The effects of Bi and Sb additions on the microstructures and casting properties in lead-free Cu-Zn-Sn broze were investigated. (1) When only Bi was added to the bronze, Bi was precipitated on the ${\delta}$ phase of ${\alpha}$ dendrite cell boundary. When Bi and Sb were added together, Bi was precipitated on the ${\delta}_A$ which was the Sb-rich area in the ${\delta}$ phase. (2) The addition of Sb accelerated the formation of ${\delta}$ phase, and when Sb, Bi and Pb were added, Bi and Pb were precipitated as mixed solution in the ${\delta}_A$ phase. (3) The combined addition of Sb and Bi resulted in the suppression of shrinkage due to the complementary effects of the mass feeding of ${\alpha}$-dendrite cluster covered with ${\delta}$ phase and sealing of micro-shrinkage in the ${\delta}$ phase by solidification expansion of Bi.

Keywords

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