Metallurgical and Materials Transactions B

, Volume 28, Issue 6, pp 1151–1155 | Cite as

Thermodynamics of phosphorus in molten Si-Fe and Si-Mn alloys

  • Shigeru Ueda
  • Kazuki Morita
  • Nobuo Sano
Article

Abstract

The thermodynamics of phosphorus in molten Si-Fe and Si-Mn alloys has been investigated at 1723 K by equilibrating the alloys in a controlled phosphorus partial pressure. The activity coefficient of phosphorus in each alloy shows a maximum value at a certain composition due to a strong interaction between silicon and iron and between silicon and manganese. Interaction coefficients between phosphorus and iron in molten silicon were found to be εPFe=7.43 and ρPFe=−16.4 (0≦XFe≦0.65), and those between phosphorus and manganese were εPMn=12.0 and ρPMn=−22.2 (0≦XMn≦0.5). Further discussion has revealed that the Si-Fe-P and Si-Mn-P systems approximately conform to a regular solution within the composition ranges investigated in the present work.

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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 1997

Authors and Affiliations

  • Shigeru Ueda
    • 1
  • Kazuki Morita
    • 1
  • Nobuo Sano
    • 1
  1. 1.the Department of MetallurgyThe University of TokyoTokyoJapan

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