期刊论文

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

Song, Jinliang

中文

原子能科学技术

1000-6931

2021

55

12

2331-2338

10.7538/yzk.2021.youxian.0760

国家自然科学基金（52072397,51602336）； 2020年度中国科学院洁净能源创新研究院合作基金（DNL202012）；

本校为第一机构

熔盐堆以石墨作为反射体和慢化体,熔盐与石墨直接接触,石墨在熔盐中的腐蚀反应和辐照损伤是值得研究的问题。本文采用自主研发的细结构石墨,阻隔熔盐浸渗,采用3.0 MeV He+模拟中子辐照,研究不同温度及熔盐环境下石墨微观形貌、微结构和化学结构的变化。研究结果表明,高温环境下,由于高温的退火效应,石墨缺陷密度的增加及形貌的变化都远小于室温环境。辐照后的石墨与熔盐接触,其缺陷密度略微降低。这种微结构的改善与高温熔盐环境中的退火效应及熔盐固化引起内部微裂纹的闭合有关。辐照后的熔盐浸泡可在石墨C—C键结构中引入C—F键,且C—F键的形成与缺陷密度及缺陷类型密切相关。稳定的空位簇及间...

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 increa...