CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhenliang Yang,Bingqing Li,Jingkun Xu,Yi Zhong,Liang Xie,Mingfu Chu,Yun Wang,Rui Gao,Libing Yu,Mingshan Wang,Guoliang Zhao,Pengcheng Zhang,Bin Bai,Chen Xu
Two strategies have been extensively employed to develop advanced accident tolerant fuels (ATF): improving thermal conductivity and producing large grain sized pellets. However, there are few reports on the simultaneous utilization of both strategies. In this work, we fabricated Mo–Cr alloy reinforced UO 2 (UMC) composite pellet with both high thermal conductivity and large grain size by a simple in-situ alloying method for the first time. The average grain size of UO 2 increased from 6 μm to 113 μm. Thermal conductivity of the UMC pellet (with 2 vol% Mo) at 1200 °C increased by 36.46% compared with pure UO 2 . The increase rate of thermal conductivity per 1 vol% dopant reached about 18%. The Mo–Cr alloy formed continuous micro-cell layer around UO 2 particles. Such continuous micro-cell Mo–Cr alloy layer and increase of UO 2 grain size both helped improve the thermal conductivity of UMC composite pellets. Thermal expansion coefficient of the UMC under the operating temperature decreased by 11.90% compared with pure UO 2 . The oxidation resistance of the UMC pellet under high temperature steam was also improved. This work provides a new strategy towards fabricating ATF with both high thermal conductivity and large grain size.
研究领域:
核能工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Dezhi Zhang,Yingru Li,Bingqing Li,Zhenliang Yang,WeiZhen Man,Linli Tan,Jianfeng Tan,Mingfu Chu,Pengcheng Zhang,Rui Gao,Xinchun Lai
In this paper, two kinds of composites constructed by UO 3 nanoflakes (which is UO 3 ·yNH 3 ·xH 2 O, precisely) and different graphene oxide (GO) nanosheets (homemade GO, GO-h, and commercial GO, GO-c) were prepared via solution chemical reaction. The two kinds of GO share similar morphology and possess the same species of functional groups. Nevertheless, GO-h possesses higher oxidization degree and thus could adsorb more uranyl ions, and the corresponding composite shows a much more regular shape: UO 3 nanoflakes and GO nanosheets cross each other, which would help overcome the disadvantage of graphene aggregation. As a result, homemade reduced graphene oxide (RGO-h) sheets inside the final UO 2 pellets (named as UO 2 /GO-h) could construct a well-bulit thermally conductive network to enhance its thermal conductivity . However, similar RGO-c network cannot be observed in the UO 2 /GO-c pellest originated from GO-c. Therefore, only the thermal conductivity of UO 2 /GO-h pellet acquires a dramatic increase, 37.30% relative to UO 2 pellet at 1200 °C, showing that UO 2 /GO-h possesses great potential for the development of novel UO 2 -based ATF fuels.
研究领域:
材料科学
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核能工程
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 18
·1498
·
IF 4.4
Penghui Lei,Xiaoyu Ji,Jie Qiu,Jiaxuan Si,Tao Peng,Changqing Teng,Lu Wu
Large-grained UO2is considered a potential accident-tolerant fuel (ATF) due to its superior fission gas retention capabilities. Irradiation experiments for cerium dioxide (CeO2), used as a surrogate fuel, is a common approach for evaluating the performance of UO2. In this work, spark plasma sintered CeO2pellets with varying grain sizes (145 nm, 353 nm, and 101 μm) and a relative density greater than 93.83% were irradiated with 4 MeV Xe ions at a fluence of 2 × 1015ions/cm2at room temperature, followed by annealing at 600 °C for 3 h. Microstructure, including dislocation loops and bubble morphology of the irradiated samples, has been characterized. The average size of dislocation loops increases with increasing grain size. Large-sized dislocation loops are absent near the grain boundary because the boundary absorbs surrounding defects and prevents the dislocation loops from coalescing and expanding. The distribution of bubbles within the grain is uniform, whereas the large-sized and irregularly shaped xenon bubbles observed in the small grain exhibit pipe diffusion along the grain boundaries. The bubble diameter in the large-grained pellet is the smallest. As the grain size increases, the volumetric swelling of the irradiated pellets decreases while the areal density of Xe bubbles increases. Elemental segregation, which tends to occur at dislocation loops and grain boundaries, has been analyzed. Large-grained CeO2pellet with lower-density grain boundaries exhibits better resistance to volumetric swelling and elemental segregation, suggesting that large-grained UO2pellets could serve as a potential ATF.
研究领域:
核材料科学
·
材料物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Liang Cheng,Biaojie Yan,Rui Gao,Xiangdong Liu,Zhenliang Yang,Bingqing Li,Yi Zhong,Pengchuang Liu,Yun Wang,Mingfu Chu,Bin Bai,Pengcheng Zhang
UO 2 /Mo composite pellets with enhanced thermal conductivity have been considered for the novel construction of high-safety fuel systems. UO 2 /Mo core-shell composite pellets with a reasonable porosity of 4–5% were fabricated by spark plasma sintering (SPS). In the SPS UO 2 /Mo composite, the majority of pores remained homogeneous in the UO 2 matrix, while it had a dense morphology in the continuous Mo channel for the heat conduction . The sintering behaviour of the UO 2 /Mo composite indicated that the incorporating Mo impeded densification of UO 2 , and the primary densification temperature ranged from 903 K to 1270 K. To introduce 2 vol% Mo to UO 2 , the thermal conductivity (TC) was enhanced to 4.02 W/m·K at 1073 K. The above result represented a 23.31% improvement over the value of 3.26 W/m·K (Fink) for a pure UO 2 pellet, which was approximated by the revised Hasselman-Johnson model. In particular, the coefficient of thermal expansion (CTE) was reduced to 10.0 × 10 −6 /K from 298 K to 1673 K, representing an 8.83% reduction from the value of 10.98 × 10 −6 /K (Martin) for a pure UO 2 pellet. The reduction effect on the CTE was superior to that of other UO 2 matrix composites fuel systems and, hence, offers an external safety aspect for reactors at the elevated temperatures close to accident conditions. These results provide a feasible method for the fabrication of a UO 2 /Mo core-shell pellet as an accident tolerant fuel.
研究领域:
核能工程
·
材料科学
✓ 已验证
DOI
高影响因子
Advanced Healthcare Materials
·
2024
·
IF 10
Yiming Chen,Huiying Li,Renfeng Xu,Yan Fang,Qinhui Chen,Zhengchao Wang,Haiqing Liu,Yunxiang Weng
Emergency prehospital wound closure and hemorrhage control are the first priorities for life-saving. A majority bioadhesives form bonds with tissues through irreversible cross-linking, and the remobilization of misalignment may cause severe secondary damage to tissues. Therefore, developing an adhesive that can quickly and tolerably adhere to traumatized dynamic tissue or organ surfaces in emergency situations is a major challenge. Inspiring by the structure of human serum albumin (HSA), a branched polymer with multitentacled sulfhydryl is synthesized, then an instant and fault-tolerant tough wet-tissue adhesion (IFA) hydrogel is prepared. The adhesive application time is just 5 s (interfacial toughness of ∼580 J/m2) and favorable tissue-adhesion is maintained after 10 cycles. IFA hydrogel remains unchangeable adhesive performance after one month of storage based on the internal oxidation-reduction mechanism. It not only can efficiently seal various organs, but also achieves effective hemostasis in models of the rat femoral artery and rabbit-ear artery. This work also proposes an effective strategy for controllable adhesion, which enables the production of asymmetric adhesives with on-demand detachment. Importantly, IFA hydrogel has sound antioxidation, antibacterial property, hemocompatibility, and cytocompatibility. Hence, the HSA-inspired bioadhesive can emerge as a promising first-aid supply for human-machine interface-based health management and non-invasive wound closure. This article is protected by copyright. All rights reserved
研究领域:
生物医学工程
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材料科学
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急诊医学
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生物材料
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）