Onion-like carbon spheres (OLC) were doped into the traditional graphite raw material system to decrease the pore diameter to ∼400 nm, with potential for use in molten salt reactors. The obtained graphite (OLCG) prepared from OLC was subjected to 7 MeV Xe irradiation in this work, and a systematic investigation was conducted to verify its irradiation behavior. The surface morphology and microstructural evolution in graphite samples under different irradiation conditions were studied with different characterization methods. The surface roughness of OLCG increased and the hill appeared at lower irradiation doses, which was similar to that of IG-110, but the filler particles of OLCG gradually become spherical at 2.5 dpa. The analysis by X-ray diffraction reveals that OLCG's graphitization degree is approaching but slightly worse compared to IG-110. Raman studies indicate that the irradiation causes an increase in defect density and in-plane disorder both in graphite. The OLC filler exhibits a greater sensitivity to radiation, leading to OLCG being slightly sensitive to radiation as compared to IG-110. Neutron irradiation of the resulting graphite should be continued as OLCG showed good irradiation resistance at low irradiation doses and had a much smaller pore diameter.

中文翻译：

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氙离子辐照洋葱状碳球填料制备超细晶石墨的表面形貌和微观结构变化

将洋葱状碳球（OLC）掺杂到传统石墨原料体系中，将孔径减小至~400 nm，具有在熔盐反应堆中使用的潜力。本工作对由 OLC 制备的石墨 (OLCG) 进行了 7 MeV Xe 辐照，并进行了系统研究以验证其辐照行为。采用不同的表征方法研究了不同辐照条件下石墨样品的表面形貌和微观结构演变。在较低的辐照剂量下，OLCG的表面粗糙度增加，并出现小山，这与IG-110相似，但在2.5 dpa时，OLCG的填料颗粒逐渐变成球形。 X射线衍射分析表明，OLCG的石墨化程度接近IG-110，但稍差。拉曼研究表明，辐照会导致石墨中的缺陷密度和面内无序增加。 OLC 填料对辐射表现出更高的敏感性，导致 OLCG 与 IG-110 相比对辐射稍敏感。应继续对所得石墨进行中子辐照，因为 OLCG 在低辐照剂量下表现出良好的耐辐照性并且具有小得多的孔径。