Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6758709 | Nuclear Engineering and Design | 2018 | 10 Pages |
Abstract
Binderless nanopore-isotropic graphite (NPIG) produced from mesocarbon microbeads by isostatic pressing method was irradiated with 7â¯MeV Xe26+ to a total peak dose of 0.1, 0.5, 2.5 and 5.0â¯dpa. The effect of the irradiation on the microstructure and physical properties of NPIG was then evaluated and compared against the performance of isostatic nuclear graphite (IG-110, TOYO TANSO CO., LTD). Ion-irradiation has a different effect on the microstructure (crystallinity, crystallite size) and mechanical properties (hardness, Young's modulus) of NPIG and IG-110 graphite. At lower irradiation doses, the surface morphology of NPIG was fragmented in a similar way to that of IG-110, but the NPIG gradually balled at 5 dpa. X-ray diffraction results show that NPIG has a lower degree of graphitization than IG-110. Raman studies indicated that NPIG reached saturation at lower doses. The nanoindentation showed that the hardness and Young's modulus of the NPIG and IG-110 increased after irradiation. Transmission electron microscopy images also provide clear evidence for an irradiation-induced increase in the number of basal dislocations and defects. Thus, although NPIG is generally more sensitive to irradiation than IG-110, its hardness is actually less affected.
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Authors
Min Liu, Wenting Zhang, Jinliang Song, Heyao Zhang, Pengfei Lian, Yantao Gao, Can Zhang, Zhoutong He, Zhanjun Liu, Mingwen Zhao, Huihao Xia, Xiangdong Liu, Xingtai Zhou,