The surface topography and microstructure change of densified nanopore nuclear graphite impregnated with polyimide and irradiated by xenon ions
The surface topography and microstructure change of densified nanopore nuclear graphite impregnated with polyimide and irradiated by xenon ions
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聚酰亚胺浸渍及氙离子辐照致密纳米孔核石墨的表面形貌及微观结构变化
DOI：
10.1016/j.apsusc.2020.147408
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发表时间：
2020-11
影响因子：
6.7
通讯作者：
Xiangdong Liu
中科院分区：
文献类型：
--
作者：
Heyao Zhang;Jinliang Song;Zhongfeng Tang;Zhanjun Liu;Xiangdong Liu
The densified isostatic graphite (D-IG-110) was obtained from isostatic graphite (IG-110) by impregnating with.polyimide, which reduced the median pore diameter of IG-110 from 2.060 μm to 0.065 μm. The D-IG-110.samples were irradiated with 7 MeV Xe26+. The surface morphology and microstructure changes of samples.were characterized by scanning electron microscopy, grazing incidence X-ray diffraction and Raman spectroscopy, respectively. The initial graphitization degree of D-IG-110 is slightly reduced due to the amorphous.structure of polyimide-derived carbon (polyimide-C). Graphite crystals undergo lattice expansion along the caxis under irradiation. Compared with IG-110, D-IG-110 samples have a lower crystallite size change rate along.the C-axis, and the polyimide-C in D-IG-110 can as a buffer for this expansion. The polyimide-C shrunk after.irradiation at lower surface irradiation dose (0.02 dpa) caused by irradiation-induced graphitization, and turned.to expand with the further increase in dose. The D-IG-110 samples irradiated at lower dose, the lower shrinkage.rate of crystallite sizes along a-axis in the region containing polyimide-C than IG-110 also indicates the irradiation-induced graphitization, and polyimide-C also slows down the rapid increase in surface residual stress
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