新型炭材料2023，Vol.38Issue(2)：393-404,12.DOI:10.1016/S1872-5805(23)60708-5
IG-110核石墨经Xe26+辐照后的形貌和微观结构演化
Topography changes and microstructural evolution of nuclear graph-ite (IG-110) induced by Xe26+ irradiation
摘要
Abstract
The microstructure of nuclear graphite, a key material in nuclear reactors, is affected by the high-flux irradiation. The damage to the graphite by irradiation is important for reactor safety. To understand the damage of nuclear graphite by irradiation, IG-110 nuclear graphite, a representative nuclear graphite, was chosen to investigate the change in morphology and microstructure caused by 7 MeV Xe26+ irradiation with peak damage doses of 0.1-5.0 displacements per atom (dpa) for samples of a size of 40.0 mm×40.0 mm×2.0 mm. The topography and microstructure of IG-110 were characterized by SEM, AFM, grazing incidence XRD, Raman spectroscopy and nano-indentation. Results indicate that after 7 MeV Xe26+ irradiation at a dose of 0. 11 dpa, a ridge-like structure appears on the surface of the IG-110 graphite, mainly in the binder region, and the surface roughness increases slightly. With a further increase of the irradiation dose, the ridge-like structure also appears in the filler region. At a dose of 0.55 dpa, pore shrinkage increases accompanied by pore closure, and the surface roughness also increases. The changes in topography and micro-structure caused by irradiation are attributed to the expansion of graphite along the c-axis direction. With increasing irradiation dose the defect density and the degree of in-plane disorder in the graphene sheets increases, while the modulus and hardness of the graph-ite first increase and then decrease. Their increase is caused by dislocation pinning and closure of fine pores, while their decrease is attributed to an increase in porosity and the generation of an amorphous structure.关键词
IG-110/核石墨/离子辐照/形貌/微观结构Key words
IG-110/Nuclear graphite/Ion irradiation/Morphology/Microstructure分类
能源科技引用本文复制引用
张鹤耀,程金星,宋金亮,阴慧琴,唐忠锋,刘占军,刘向东..IG-110核石墨经Xe26+辐照后的形貌和微观结构演化[J].新型炭材料,2023,38(2):393-404,12.基金项目
This work was supported by the National Natur-al Science Foundation of China (No. 52072397) and the DNL Cooperation Fund, CAS(DNL202012).基金项目:国家自然科学基金项目(No.52072397) （No. 52072397）
中国科学院洁净能源创新研究院合作基金 (DNL202012). （DNL202012）
