Si-rich phases and their distributions in the oxide scale formed on 304 stainless steel at high temperatures

Lichun Zheng, Kazuya Hosoi, Shigeru Ueda, Xu Gao, Shin ya Kitamura, Yoshinao Kobayashi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Si-rich phases and their distributions in the oxide scale formed on 304 stainless steel (304SS) kinetically affects SiO2 volatilization for the formation of silicate-based Cs-bearing microparticles released during the Fukushima Daiichi Nuclear Power Plant accident. Therefore, we investigated Si-rich phases and their distributions in the oxide scale on 304SS oxidized in H2O–H2 mixtures over the temperature range 1000–1300 °C. SiO2 film stays at the base of the Cr2O3-type scale formed at low temperatures or high H2 contents in steam. Fe2SiO2 phase is non-uniformly distributed in the spinel-type scale formed under opposite conditions. Fe2SiO2 accumulation in the spinel-type scale is attributed to its thermodynamically metastable state in H2O–H2 mixtures. With increasing oxidation time, Fe2SiO2 phase was further oxidized into SiO2 phase.

Original languageEnglish
Pages (from-to)327-338
Number of pages12
JournalJournal of Nuclear Materials
Volume507
DOIs
Publication statusPublished - 2018 Aug 15

Keywords

  • 304 stainless steel
  • FeSiO
  • High temperatures
  • Oxidation
  • Si distribution
  • SiO

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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