作　　者： (黄庆）; (李健健）; (黄鹤飞）; (闫隆）; (朱智勇）;

机构地区： 中国科学院上海应用物理研究所

出　　处： 《核动力工程》 2017年第S1期67-70,共4页

摘　　要： 采用氙离子辐照表面抛光的IG110核石墨样品,对辐照后核石墨样品的表面形貌和辐照损伤进行表征。结果表明,室温辐照导致石墨晶粒严重的各向异性肿胀。但肿胀并未导致晶间裂纹的产生,这被归因于核石墨的辐照蠕变机制。严重的肿胀导致核石墨大量孔隙收缩,说明在熔盐堆中辐照在一定剂量范围内不会促进熔盐对核石墨的浸渗。通过拉曼光谱的分析推断,G峰宽度随着辐照剂量的增加而单调增加,随着退火温度的增加又逐渐减小,因而是表征核石墨辐照损伤的很好的参数。 Surface-polished IG110 nuclear graphite samples were irradiated with xenon ions. The surface morphology and irradiation damage was characterized before and after irradiation. Irradiation at room temperature induced severe anisotropic swelling of the graphite crystallites, but the swelling did not cause intergranular cracking, which was ascribed to the well-known irradiation-induced creep of unclear graphite. The severe swelling caused the shrinkage of many pores in the unclear graphite, indicating that irradiation to a certain dose would not enhance the salt infiltration into the unclear graphite in molten salt reactors. Raman spectra showed that G peak width increased monotonically with the increasing dose, and decreased gradually with the increasing of the annealing temperature, thus showed a potential to characterize the irradiation damage in the unclear graphite.

关 键 词： 核石墨 离子辐照 各向异性肿胀