Hydrothermal synthesis of uranium dioxide and graphene composite and its application as an additive for uranium-dioxide-based accident tolerant fuel

Zhang, Dezhi; Li, Yingru; Gao, Rui; Li, Bingqing; Yang, Zhenliang; Yan, Biaojie; Liu, Xuxu; Wang, Zhiyi; Huang, Qiqi; Tang, Hao; Ren, Yiming; Li, Rui; Gai, Tao; Lai, Xinchun

doi:10.1016/j.ceramint.2020.12.250

Cited by 3 publications

(2 citation statements)

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“…As a promising second-phase additive in UO 2 fuel pellets, graphene has a high melting point (~3773 K) and thermal conductivity (~3000 W/(m•K)) at room temperature, and is stable at high temperatures [8,9]. T. Yao et al reported highly thermally conductive and mechanically strong UO 2 -graphene composite fuels using a metallurgical approach; the composite fuels possessed greatly improved thermal conductivities (74% and 162 wt.% enhancement at room temperature along the radial direction for 1 wt.% and 5 wt.% graphene composites), and they observed 150% improvement in fracture toughness compared to UO 2 [8].…”

Section: Introductionmentioning

confidence: 99%

“…T. Yao et al reported highly thermally conductive and mechanically strong UO 2 -graphene composite fuels using a metallurgical approach; the composite fuels possessed greatly improved thermal conductivities (74% and 162 wt.% enhancement at room temperature along the radial direction for 1 wt.% and 5 wt.% graphene composites), and they observed 150% improvement in fracture toughness compared to UO 2 [8]. D. Zhang et al reported a hydrothermal approach to synthesize UO 2 and RGO sheets with an enhancement of approximately 35.4% in thermal conductivity [9]. Current research on UO 2 -graphene composite fuels remain in its infancy.…”

Section: Introductionmentioning

confidence: 99%

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Mechanism and Properties of UO2–Graphene Composite Fuel Prepared by In Situ Synthesis

Yin

2022

Crystals

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A nucleation method based on a composite of uranium dioxide (UO2) and graphene is presented by in situ synthesis, and the relevant mechanism and fuel properties are investigated. UO2–graphene composite fuel powders containing graphene volume (2%, 4%, 6%, and 8%) were prepared using a nucleation method through the reactive deposition of uranyl nitrate and aqueous ammonia on graphene by controlling the reaction parameters. The composite fuel pellets were prepared using spark plasma sintering (SPS). The results showed that the uniformity of UO2–graphene powder prepared by in situ synthesis reached up to 96.39%. An analysis on the relevant phase structure showed that only UO2 and graphene existed in the sintered pellets at 1723 K, graphene and UO2 were not destroyed during the reaction, and the pellet densities for the in-situ synthesis were 95.56%TD, 95.32%TD, 95.08%TD, and 94.76%TD for graphene contents of 2%, 4%, 6%, and 8%, respectively. The thermal conductivities of pellets at 293 K increased by 12.27%, 20.13%, 27.47%, and 34.13%, and by 18.36%, 35.00%, 47.07%, and 58.93% at 1273 K for 2%, 4%, 6%, and 8% graphene contents, respectively. The performance of graphene in the fuel was superior at high temperatures, which overcame shortcomings due to the low thermal conductivity of UO2 at high temperatures. SEM results showed that the grain sizes of the pellets prepared by synthesis in situ were 10–30 μm, and there was no obvious pore at the grain boundary because the grains were closely bound. The graphene was uniformly coated by UO2, and the thermal conductivity of the pellets improved upon the formation of a bridging heat conduction network.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%