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 al1oys 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.

Behaviour of Materials for Accelerator Driven Systems in Stagnant Molten Lead

Martini, C.;Buttol, P.
2000-06-01

Abstract

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 al1oys 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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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12079/1092
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