Activity measurement of silicon in molten Cu-Si binary alloy

Takahiro Miki, Naotaka Ogawa, Tetsuya Nagasaka, Mitsutaka Hino

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


The activity of Si in molten Cu-Si alloy was determined by a new experimental technique, that is, the combination of chemical equilibration technique and mass spectrometry. The ion current ratio of SiO to Cu at 1 600-1 700 K was measured for Cu-Si alloy equilibrated with SiO2 by mass spectrometry. Since the vapor pressure of Si is relatively low, the formation reaction of volatile sub-oxide, SiO, was utilized in the present work. The activity coefficient of Si in liquid copper at 1 623 K was also determined by equilibrating a Cu-Si alloy with SiO2 saturated CaO-Al2O3-SiO2 slag in a graphite crucible under CO atmosphere. From these results, the activity coefficient of Si in copper at 1 600-1 700 K was determined. The thermodynamic property of Cu-Si alloy was assessed and it was confirmed that the present work agreed with the reported phase diagram of Cu-Si binary system.

Original languageEnglish
Pages (from-to)1071-1076
Number of pages6
JournalIsij International
Issue number10
Publication statusPublished - 2002


  • Activity
  • Copper
  • Excess Gibbs energy
  • Mass spectrometry
  • Silicon
  • Thermodynamics

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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