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 language | English |
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Pages (from-to) | 327-338 |
Number of pages | 12 |
Journal | Journal of Nuclear Materials |
Volume | 507 |
DOIs | |
Publication status | Published - 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