A Study on the Formation Mechanism of the Interfacial Layer Between Solid CaO and Molten Iron Alloys

Sunghee Lee, Dong Joon Min

Research output: Contribution to journalArticle


The present study aims to clarify the formation mechanism of the interfacial layer between solid CaO and molten iron through SEM–EDS analysis. The interfacial layer formed between CaO and molten iron is observed by SEM–EDS for different compositions of molten iron (CaO/Fe–C–S interface: CaS layer; CaO/Fe–C–Si–S interface: CaS and Ca2SiO4 layers; CaO/Fe–C–Si interface: no interfacial layer; CaO/Fe–S–Si interface: Ca2SiO4 and CaS layers). The effect of S and Si concentrations on layer formation is discussed using the following proposed mechanism.CaO(s)+S̲=CaS(s)+12O22CaO(s)+Si̲+O2=Ca2SiO4(s) In the case of the Fe–C–Si–Al–S/CaO interface, CaS and Ca3Al2O6 layers are observed. The formation mechanism of a reaction layer for Al-containing iron melts is also proposed as below.CaO(s)+S̲=CaS(s)+12O23CaO(s)+2Al̲+32O2=Ca3Al2O6(s).

Original languageEnglish
Pages (from-to)248-256
Number of pages9
JournalMetals and Materials International
Issue number1
Publication statusPublished - 2019 Jan 18


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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