Influence of superficial oxidation on the pyrophoric behaviour of uranium hydride and uranium powders in air

Ablitzer, Carine; Guyadec, F. Le; Raynal, J.; Genin, Xavier; Duhart-Barone, Anne

doi:10.1016/j.jnucmat.2012.08.008

Cited by 21 publications

(6 citation statements)

References 22 publications

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“…Particle areas were found using ImageJ software, and diameters are reported as if from a circle of equivalent area since particles were irregularly shaped (Figure 2). Images obtained were comparable to those shown in Ablitzer et al in which uranium powders were imaged using SEM after being created from thermal dissociation of UH 3 powder [9]. For their work, these samples were in a hydrogen or inert argon environment aside from exposure to air during SEM sample preparation [9].…”

Section: Methodssupporting

confidence: 69%

“…Due to its pyrophoric nature, uranium powder exposed to air at room temperature forms an oxide layer primarily comprising UO 2 [4,[7][8][9]. Calculations performed using NASA CEA [10] with constant enthalpy and pressure (and φ � 1) indicate that the adiabatic fame temperature of uranium in air and oxygen are 3773 K and 4843 K, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Uranium Dust Cloud Combustion: Burning Characteristics and Absorption Spectroscopy Measurements

Weerakkody

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Clemenson

et al. 2022

Journal of Combustion

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This study characterized uranium metal dust cloud combustion using absorption spectroscopy, imaging, and broadband emission measurements. Other metals were similarly combusted to establish correlations between results from this study and those found in the literature. It was determined that the burn temperature of uranium was limited to the volatilization temperature of uranium dioxide. Combustion behavior was similar to that of other refractory metals in terms of burn time and the observation of exploding particle behavior.

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Section: Methodssupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Uranium Dust Cloud Combustion: Burning Characteristics and Absorption Spectroscopy Measurements

Weerakkody

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Clemenson

et al. 2022

Journal of Combustion

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“…Interaction of hydrogen with uranium is one of serious issues in the field of nuclear energy and weapons. Any contact with H is detrimental for mechanical integrity and in addition a very fine powder of uranium hydride tends to self-ignition if exposed to air 1. On the other hand, uranium hydride provides a tool to observe the impact of expansion of the U lattice, allowing the formation of U moments and their ferromagnetic ordering.…”

Section: Introductionmentioning

confidence: 99%

Electronic properties ofα−UH3stabilized by Zr

et al. 2015

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Pure hydride of the α-UH type without any β-UH admixture was prepared by high-pressure hydrogenation of U stabilized by Zr. Such material, characterized by a general formula (UH) Zr , is stable in air at ambient and elevated temperatures. H release is observed between 400-450 °C similar to β-UH. Its stability allowed to measure magnetic properties, specific heat, and electrical resistivity in a wide temperature range. Despite rather different crystal structure and inter-U spacing, the electronic properties are almost identical to β-UH. Its ferromagnetic ground state with Curie temperature ≈ 180 K (weakly and non-monotonously dependent on Zr concentration) and U moments of 1.0 μ indicate why mixtures of α- and β-UH exhibited only one transition. Magnetic ordering leads to a large spontaneous magnetostriction = 3.210, which can be explained by the increase of the spin moment between the paramagnetic (Disordered Local Moment) and the ferromagnetic state. The role of orbital moments in magnetism is indicated by fully relativistic electronic structure calculations.

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“…The formed corrosion product, uranium hydride (UH 3 ), is a highly pyrophoric and unstable substance and, therefore, classed as a potential hazard due to the potential for enhanced radionuclide release and dispersion of gas/solid fission products arising from the spent nuclear fuel (SNF) material (fire, smoke containing fission products, etc.) [4,5]. The reaction can be described by four distinct stages:…”

Section: Introductionmentioning

confidence: 99%

The effect of work-hardening and thermal annealing on the early stages of the uranium-hydrogen corrosion reaction

2018

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A B S T R A C TThe characteristics of hydride formation on metallic U at the early stages were investigated for three differently treated samples. The first sample reacted in its as-received state, the second was thermally annealed and the third sample underwent cold work-hardening prior to reaction with deuterium. From the analysis, the vacuum heat-treated sample was found to be more resilient to hydriding at the nucleation and growth stage, exhibiting a reduced number of nucleation points when compared to the as-cast uranium. The work-hardened sample was observed to be more susceptible to H 2 corrosion, displaying very dissimilar hydriding behaviour when compared to the other.

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Influence of superficial oxidation on the pyrophoric behaviour of uranium hydride and uranium powders in air

Cited by 21 publications

References 22 publications

Uranium Dust Cloud Combustion: Burning Characteristics and Absorption Spectroscopy Measurements

Uranium Dust Cloud Combustion: Burning Characteristics and Absorption Spectroscopy Measurements

Electronic properties ofα−UH3stabilized by Zr

The effect of work-hardening and thermal annealing on the early stages of the uranium-hydrogen corrosion reaction

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