Excluding molten fluoride salt from nuclear graphite by SiC/glassy carbon composite coating

Zhu, He; Song, Jinliang; Lian, Pengfei; Zhang, Dongqing

doi:10.1016/j.net.2019.03.006

Cited by 17 publications

(3 citation statements)

References 31 publications

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“…Molten salts have regained tremendous attention − in recent years due to their applications in molten salt reactors (MSRs) − and spent-fuel reprocessing. − For instance, molten LiF/BeF 2 /ThF 4 /UF 4 and molten NaF/NaBF 4 act as fuel salts and coolants in the molten salt breeder reactor (MSBR). Xu et al successfully extracted U from molten LiCl/KCl/AlCl 3 /U 3 O 8 via electrolysis at −2.0 V. In these applications, molten salts were exposed to ionizing radiations, which generate excess electrons and holes.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of an Excess Electron in Molten LiF, KF, MgF₂, and BeF₂

Li,

Zhao,

Qian

et al. 2024

Inorg. Chem.

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Ab initio molecular dynamics simulations suggest that the dynamics of an excess electron in different types of molten salts are not always the same. In molten LiF, KF, and MgF 2 , the excess electron localizes in the cavity as a solvated electron for 10 ps, which agrees with the widely accepted theory of Pikaev. In molten BeF 2 , the excess electron shows a different localization pattern: it mostly exists in localized states but also occurs in many delocalized states. This "localize−delocalize" pattern originates from the high viscosity of BeF 2 (16 000 cP at 900 °C), which will lead to slow ionic motion and finally result in slow solvent relaxation. Besides, the species formed by the localization of the excess electron in these four melts are also different. The spectral feature (broad peak in the vis−IR region) of the localized electron in molten alkaline halides was also observed in LiF, KF, MgF 2 , and BeF 2 . Both an excess electron and electrons in the bulk liquid could contribute to the spectra, but the excitation of the excess electron makes a bigger contribution to the broad vis−IR peak. Our predicted spectrum of molten LiF/KF qualitatively reproduces the major feature of the experimental spectrum, which partially validates our simulations.

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Section: Introductionmentioning

confidence: 99%

Dynamics of an Excess Electron in Molten LiF, KF, MgF₂, and BeF₂

Li,

Zhao,

Qian

et al. 2024

Inorg. Chem.

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“…Many studies on the infiltration behavior of molten salt in nuclear graphite have been reported in recent years [4][5][6][7][8][9][10][11][12]. Additionally, the effects of molten salt infiltration on chemical bonding [13,14],…”

Section: Introductionmentioning

confidence: 99%

The infiltration behavior and chemical compatibility of molten lead-bismuth eutectic in nuclear graphite at elevated temperature

Zhu

Marrow

Song

2021

Journal of Nuclear Materials

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“…15 More graphite development studies published in recent years reported impregnation experiments with phenolic resin 16 and surface sealing by pyrolytic carbon, 15,17,18,19 glassy carbon, 20 silicon carbide, 21,22 or combinations thereof. 23 Early attempts within the MSRE program to obtain compact graphite bodies by manipulating the grain size and nature of raw materials 15 belong to the second category. Newer reports emerged regarding the fabrication of binderless nanopore isotropic graphite 24,25 and fine-grain 26,27 and ultrafine-grain graphite 28 that use various fillers and dispersion techniques.…”

Section: Introductionmentioning

confidence: 99%