|Behaviour of materials for accelerator driven systems in stagnant molten lead
|Tipo di pubblicazione
|Articolo su Rivista peer-reviewed
|Anno di Pubblicazione
|Benamati, G., Buttol P., Imbeni V., Martini C., and Palombarini G.
|Journal of Nuclear Materials
|Accelerator driven systems, Argon, Chemical reactions, Chromium compounds, Immersion tests, Iron oxides, Lead, Materials testing, Molten materials, Oxygen, Oxygen saturated liquid lead, Particle accelerators, Stagnant molten lead, Steel, Surfaces, Ternary systems, Tungsten
The behaviour of a modified F82H martensitic steel (both uncoated and aluminised) and tungsten was evaluated by immersion tests in stagnant, oxygen-saturated liquid lead at 793 K under an argon atmosphere, for exposure times up to 3700 h. The F82H steel is a candidate structural material for Accelerator Driven Systems (ADS), while tungsten is potentially suitable for a beam window working immersed in liquid lead. Layers of Me3O4 consisting of an inner sublayer with Me = Fe and Cr and an outer chromium-free sublayer of Fe3O4, formed on the surface of the uncoated steel while the aluminised steel showed no significant alteration. On tungsten, a compact and adherent layer of WO3 formed and reacted with liquid lead leading to the formation of friable Pb-W-O ternary compounds. A two-step mechanism is proposed for interactions of metals and alloys exposed to oxygen-saturated molten lead: the first step is the solid phase oxidation of the base metal; the second is the interaction between liquid lead and the oxide layer formed on the metal surface.
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