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Ion-beam-assisted characterization of quinoline-insoluble particles in nuclear graphite 被引量:1
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作者 Qing Huang Xin-Qing Han +3 位作者 Peng Liu Jian-Jian Li Guan-Hong Lei Cheng Li 《Nuclear Science and Techniques》 SCIE CAS CSCD 2020年第10期23-32,共10页
The irradiation behavior of graphite is essential for its applications in the nuclear industry.However,the behavioral differences of graphite remain obscure because of the very limited comprehension of its microstruct... The irradiation behavior of graphite is essential for its applications in the nuclear industry.However,the behavioral differences of graphite remain obscure because of the very limited comprehension of its microstructural differences.One typical structure,the quinoline-insoluble(QI)particle,was investigated using IG-110 and NBG-18 graphite.After irradiation,the QI particles on the polished surface were proven to become hillocks,which were easily identifiable via scanning electron microscopy(SEM).Thus,a method that combined ion irradiation and SEM characterization was proposed to study the distribution and concentration of QI particles in graphite.During irradiation,the QI particles were found to evolve into densified spheres,which were weakly bonded with the surrounding graphite structures,thereby indicating that the densification of QI particles did not evidently contribute to graphite dimensional shrinkage.A much higher concentration of QI particles in NBG-18 than IG-110,which was suggested to be responsible for the smaller maximum dimensional shrinkage of former over the latter during irradiation,was characterized. 展开更多
关键词 Heavy ion irradiation Nuclear graphite quinoline insoluble MICROSTRUCTURE
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Mesophase formation of coal-tar pitches used for impregnant of C/C composites 被引量:2
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作者 巩前明 黄启忠 +2 位作者 黄伯云 张福勤 陈腾飞 《中国有色金属学会会刊:英文版》 CSCD 2001年第4期483-487,共5页
By a polarized light optical microscopy with a hot stage, liquid phase nuclear magnetic resonance 13 C NMR and 1 H NMR, X ray diffractometry and scanning electron microscopy (SEM), the factors that affect the formatio... By a polarized light optical microscopy with a hot stage, liquid phase nuclear magnetic resonance 13 C NMR and 1 H NMR, X ray diffractometry and scanning electron microscopy (SEM), the factors that affect the formation of mesophase in C/C composites, such as pressure, quinoline insolubles (QI) and heterocylic compounds, were analyzed. Further, the graphitizability of the resultant carbon was discussed. The results indicate that to some degree, QI contents accelerate the formation of mesophase at atmospheric pressure; while at high pressure, the coalescence and growth of mesophase spherules are impeded and the resultant coke produced from higher QI content pitch is harder to be graphitized. This is in agreement with the transfer of microstructure from domain anisotropy to fine grained mosaics. 展开更多
关键词 C/C composites coal tar pitch MESOPHASE quinoline insolubles GRAPHITIZATION
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