Oxidation behavior of U–10 wt% Mo alloy in air at 473–773 K

Kang, Kweon Ho; Kim, Si Hyung; Kwak, Kyung Kil; Kim, Chang Kyu

doi:10.1016/s0022-3115(02)00905-4

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…17 Alloying with molybdenum has also been shown by gravimetric methods and X-ray diffraction (XRD) to improve corrosion performance compared with unalloyed uranium, however, not to the same level as for niobium. [18][19][20] A recent XPS investigation into the effects of various surface preparation steps on the oxidation of a U-10 wt% Mo alloy found a protective role for molybdenum in the prevention of formation of higher uranium oxides, although this was following extended periods of exposure to 97% humidity. 21 To date, mechanistic studies that attempt to determine whether the initial process of U-Mo alloy corrosion exhibits similar characteristics to U-Nb alloys and whether any differences may have an effect on the lower protective performance of U-Mo are lacking.…”

Section: Scanningmentioning

confidence: 99%

“…Similarly, a U‐20‐at% Zr was shown by XPS to form ZrO 2 following 5 L O 2 dose, albeit to a lesser extent than uranium oxidation . Alloying with molybdenum has also been shown by gravimetric methods and X‐ray diffraction (XRD) to improve corrosion performance compared with unalloyed uranium, however, not to the same level as for niobium . A recent XPS investigation into the effects of various surface preparation steps on the oxidation of a U‐10 wt% Mo alloy found a protective role for molybdenum in the prevention of formation of higher uranium oxides, although this was following extended periods of exposure to 97% humidity …”

Section: Introductionmentioning

confidence: 99%

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Oxidation of a depleted uranium‐5 wt% molybdenum (U‐5Mo) alloy in UHV by AES and XPS

Bacon

Brierley

Baker

et al. 2019

Surface & Interface Analysis

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Early stage oxidation of a dilute‐depleted uranium‐molybdenum alloy was analysed in situ under ultra‐high vacuum conditions by AES and XPS. At the equivalent of less than 300 ns at 1‐atm O2, U‐5Mo oxidizes to form stoichiometric UO2. No molybdenum oxidation is observed. After an oxygen dose of approximately 39 L, the oxide layer approached a limiting thickness of approximately 2.4 nm. The oxidation kinetics followed a logarithmic rate law, with the best fit to the experimental data for the oxide thickness, d, being given by d = 1.26 log(0.12t + 0.56). Changes in oxygen KLL and 1s peak positions associated with transformation from chemisorbed oxygen to metal oxide were observed at similar oxygen doses of 2.3 and 2.6 L O2 by AES and XPS, respectively, which opens up the possibility of using well‐characterized XPS chemical information to inform Auger peak shifts.

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Section: Scanningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Oxidation of a depleted uranium‐5 wt% molybdenum (U‐5Mo) alloy in UHV by AES and XPS

Bacon

Brierley

Baker

et al. 2019

Surface & Interface Analysis

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show abstract

“…oxidation-resistance, and mechanical properties, but the diversity of alloying elements enlarges the uranium-base alloy systems, which scatters the researches, such as described for U-Nb [28], U-Nb-Zr [87], U-Cr [16,18], U-Mo [46], etc. In literature, the majority is concentrated on physical metallurgy and mechanical properties of uranium alloys; only limited oxidation studies were recorded.…”

Section: Reaction Of U-nb Alloy Under Different Conditionsmentioning

confidence: 99%

Recent advances in study of uranium surface chemistry in China

2014

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Uranium is very important in nuclear energy industry; however, uranium and its alloys corrode seriously in various atmospheres because of their chemical reactivities. In China, continuous investigations focused on surface chemistry have been carried out for a thorough understanding of uranium in order to provide technical support for its engineering applications. Oxidation kinetics of uranium and its alloys in oxidizing atmospheres are in good agreement with those in the literature. In addition to the traditional techniques, non-traditional methods have been applied for oxidation kinetics of uranium, and it has been verified that spectroscopic ellipsometry and X-ray diffraction are effective and nondestructive tools for in situ kinetic studies. The inhibition efficiency of oxidizing gas impurities on uranium hydrogenation is found to follow the order CO 2 > CO > O 2 , and the broadening of XPS shoulders with temperature in depth profile of hydrogenated uranium surface is discussed, which is not mentioned in the literature. Significant progress on surface chemistry of alloyed uranium (U-Nb and U-Ti) in hydrogen atmosphere is reported, and it is revealed that the hydrating nucleation and subsequent growth of alloyed uranium are closely connected with the surface states, underlying metal matrix, and it is microstructure-dependent. In this review, the recent advances in uranium surface chemistry in China, published so far mostly in Chinese language, are briefly summarized. Suggestions for further study are made.

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“…It has been stated that the wear resistance of Al can be increased considerably with increasing addition of Si under a certain constant load-variable sliding speed [4,5]. It has also been shown in many studies that some elements such as Ti, V, Cu, and Sn increase the wear resistance and mechanical properties of Al-based alloys and that in particular, Pb contents increase load capacity of a journal bushing [6,7]. In addition, it is also indicated that the wear resistance of such alloys is increased with adding Sr, Zn, and Zr after heat treatment [5,8].…”

Section: Introductionmentioning

confidence: 99%

Effects of Mold Pressure on Mechanical, Microstructures, Oxidation Behavior, and Thermodynamic Properties of an Al-Based Alloy

Kaplan

Yakuphanoğlu

Yıldız

2006

Materials and Manufacturing Processes

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In this study, the effects of mold pressure variation on the microstructure, mechanical, oxidation behavior, and thermodynamics properties of an AlSi12CuNi alloy have been investigated by means of optical microcopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, differential thermal analysis, and thermo-gravimetric analysis techniques. It is observed that hardness and tensile strength of the alloys increase as die-casting mold pressure increases due to an improvement in the distribution pattern of secondary phases and reduction in porosity. Oxidation behavior parameters and thermodynamic parameters such as formation enthalpy, heat capacity, and entropy are determined from TGA and DTA. It is found that mold pressure also has a significant effect on the oxidation behavior and thermodynamic parameters.

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Oxidation behavior of U–10 wt% Mo alloy in air at 473–773 K

Cited by 8 publications

References 14 publications

Oxidation of a depleted uranium‐5 wt% molybdenum (U‐5Mo) alloy in UHV by AES and XPS

Oxidation of a depleted uranium‐5 wt% molybdenum (U‐5Mo) alloy in UHV by AES and XPS

Recent advances in study of uranium surface chemistry in China

Effects of Mold Pressure on Mechanical, Microstructures, Oxidation Behavior, and Thermodynamic Properties of an Al-Based Alloy

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