Measurement and thermodynamics of carbon solubilities in molten Si–Fe, Si–Ni, and Si–Cr–Fe Alloys at 2 073 K

Sakiko Kawanishi, Takeshi Yoshikawa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The equilibrium phase relations of molten Si–Fe, Si–Ni, and Si–Fe–Cr alloys saturated with either silicon carbide (SiC) or graphite, which are candidates for the solvent for rapid solution growth of SiC, have been investigated. The measured carbon solubilities at 2 073 K were 0.19–6.6 mol% for the Si–(24.1–70.1) mol% Fe, 0.061–5.2 mol% for Si–(30.0–85.0) mol% Ni, and 1.1–3.9 mol% for Si–(50−x) mol% Fe–x mol% Cr (x = 10.4–40.1) alloys. A quasi-chemical model that assumes that the carbon atoms are introduced into the interstitial sites of the Si–Fe, Si–Ni, and Si–Fe–Cr solvents and obstruct the bonding between solvent atoms was used to evaluate the activity coefficient of carbon in each alloy. The estimation reproduced the trends of the measured carbon solubilities fairly well. However, the estimation using the sub-regular solution model often overestimated the carbon solubilities. Thus, the carbon behavior in molten silicon–transition metal alloys is well described by the quasi-chemical model.

Original languageEnglish
Pages (from-to)2123-2128
Number of pages6
JournalIsij International
Volume60
Issue number10
DOIs
Publication statusPublished - 2020 Oct 15

Keywords

  • Carbon solubility
  • Quasi-chemical model
  • Thermodynamics

ASJC Scopus subject areas

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

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