Microstructure and Chemical Stability of Fine-grained Isotropic Graphite under Molten Salt/Irradiation Environment

被引：0

作者：

Jin G. ^{[1
]}

Zhang H. ^{[2
]}

Lian P. ^{[3
]}

Cheng J. ^{[4
]}

Wang Q. ^{[4
]}

Yu A. ^{[3
]}

Song J. ^{[5
]}

Tang Z. ^{[5
]}

Liu Z. ^{[3
]}

机构：

[1] School of Nuclear Science and Technology, University of South China, Hengyang

[2] School of Microelectronics and Control Engineering, Changzhou University, Changzhou

[3] Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan

[4] Beijing High-tech Institute, Beijing

[5] Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai

来源：

Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | 2021年 / 55卷 / 12期

关键词：

Chemical bonding; Fine-grained isotropic graphite; Irradiation behavior; Molten salt nuclear reactor;

D O I：

10.7538/yzk.2021.youxian.0760

中图分类号：

学科分类号：

摘要：

Molten salt nuclear reactor (MSR) uses graphite as a neutron moderator or reflector, and the graphite is directly contacted with the molten salt. The irradiation stability of the graphite and chemical reaction corrosion between the graphite and salt is the critical researches to be studied. Microstructure, crystal structure, chemical bonding and property of the ion-implanted fine-grained isotropic graphite under different irradiation doses were studied by using the 3.0 MeV He+ simulation. The results show that under high temperature, the increase of the defect concentration and surface morphology change are much less than those under the room temperature because of the high temperature annealing. The defect concentration decreases under the irradiation and molten salt environment. The improvement of microstructure is related to the annealing effect in high temperature molten salt environment and the closure of internal microcracks caused by molten salt solidification. The C-F bond could be detected by the long time molten salt immersion, which is closely related to the defect concentration and types. Vacancy cluster and migration of the interstitial atom affect the formation of the graphite intercalation compounds. It is all not avail to forming the C-F bonds, which decreases the destructive effect of the graphite surface structure. © 2021, Editorial Board of Atomic Energy Science and Technology. All right reserved.

引用

页码：2331 / 2338

页数：7

共 31 条

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