Characterization of δ-PuGa (1 at%. Ga) Oxidation Under Dry Oxygen Atmosphere Exposure

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Oxidation of Metals Pub Date : 2024-08-20 DOI:10.1007/s11085-024-10267-6

N. Favart, B. Ravat, L. Jolly, I. Zacharie-Aubrun, P. Martin, D. Menut, I. Popa, B. Oudot

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Abstract

The oxidation of δ-stabilized plutonium alloy was studied under dry oxygen exposures for temperatures varying from 100 up to 300 °C and oxygen partial pressures varying from 10^–4 up to 500 mbar. The coupling of X-ray diffraction, Raman spectroscopy and FIB-SEM has allowed to show that the oxide scale is composed of an outer layer of PuO₂ and an inner mixed layer of α + β-Pu₂O₃ platelets propagating into a metallic zone corresponding to the stable phase of unalloyed Pu. Furthermore, the analysis of Pu oxidation kinetics has displayed first a parabolic growth governed by the diffusion of interstitial oxygen. This step consists of the thickening of the Pu₂O₃ layer with a decrease in α-Pu₂O₃ ratio in favor of β-Pu₂O₃. Then, a second step occurs consisting of a linear growth of the PuO₂-layer with the formation of thick nodules which tend to cover the whole oxide surface. Based on the results of this work, a general oxidation mechanism for δ-Pu alloy is provided.

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干氧大气暴露下 δ-PuGa (1 at%. Ga) 氧化的特性分析

研究了δ稳定钚合金在干氧气暴露下的氧化过程，温度范围从 100 ℃ 到 300 ℃，氧分压范围从 10-4 到 500 毫巴。通过 X 射线衍射、拉曼光谱和 FIB-SEM 的联用，可以看出氧化鳞是由外层的 PuO2 和内层的 α + β-Pu2O3 小板的混合层组成的，这些小板扩展到金属区，与未合金化的钚的稳定相相对应。此外，对钚氧化动力学的分析表明，首先是受间隙氧扩散影响的抛物线增长。这一步包括 Pu2O3 层的增厚，α-Pu2O3 比值的降低有利于 β-Pu2O3。然后，第二步是钚氧化物层的线性增长，形成厚结节，并逐渐覆盖整个氧化物表面。根据这项工作的结果，提供了 δ-Pu 合金的一般氧化机制。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

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