Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effects of Te on the Anti-Galling Properties of Ni-Cr-Sn-Bi Alloy

Ni-Cr-Sn-Bi합금의 anti-galling 특성에 미치는 Te의 영향

  • Ha Heon-Phil (Division of Materials, Korea Institute of Science and Technology) ;
  • Kim Kyung-Tak (School of materials science and engineering, Hongik University) ;
  • Shim Jae Dong (School of materials science and engineering, Hongik University) ;
  • Kim Yong Kyu (School of materials science and engineering, Hongik University)
  • 하헌필 (한국과학기술연구원 재료연구부) ;
  • 김경탁 (홍익대학교 재료공학부) ;
  • 심재동 (홍익대학교 재료공학부) ;
  • 김용규 (홍익대학교 재료공학부)
  • Published : 2005.01.01
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Abstract

Ni-Cr-Sn-Bi alloys were prepared by air melting and sand casting method and their anti-galling behaviors were examined. Anti-galling properties were dominantly influenced by Bi-rich low temperature precipitates. Alloying effects on the anti-galling properties were investigated for several alloying elements to improve anti-galling properties of the alloy. An alloy with $1-3wt\%$ of Te showed markedly improved anti-galling properties. Metallographic and tribological tests were carried out to find out reasons for excellent properties. It was found that Te containing alloy has finely distributed precipitates of Bi-rich phase. The addition of Te changed the morphology of the Ni-rich primary phase from globular to fine dendritic. As a result, the anti-galling phase precipitated between dendrite arms with fine distribution showed excellent anti-galling properties.

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References

  1. D. K. Subramanyam and J. Hoag, The bulletin of the bismuth institute, 47, 1 (1985)
  2. ASTM specification D 3702, 1 (1994)