Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2020, Vol. 31 ›› Issue (10): 98 doi: 10.1007/s41365-020-00813-7

• NUCLEAR ENERGY SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Ion-beam-assisted characterization of quinoline-insoluble particles in nuclear graphite

Qing Huang1 • Xin-Qing Han2 • Peng Liu2 • Jian-Jian Li1 • Guan-Hong Lei1 • Cheng Li1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    2 School of Physics, State Key Laboratory of Crystal Materials, Key Laboratory of Particle Physics and Particle Irradiation (MOE), Shandong University, Jinan 250100, China
  • Received:2020-06-29 Revised:2020-07-30 Accepted:2020-08-01
  • Contact: Qing Huang
  • Supported by:
    This work was supported by Youth Innovation Promotion Association of the Chinese Academy of Sciences (No. 2019262) and the National Natural Science Foundation of China (Nos. 11505265, 11805256, 11805261).
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Qing Huang, Xin-Qing Han, Peng Liu, Jian-Jian Li, Guan-Hong Lei, Cheng Li. Ion-beam-assisted characterization of quinoline-insoluble particles in nuclear graphite.Nuclear Science and Techniques, 2020, 31(10): 98     doi: 10.1007/s41365-020-00813-7

Abstract: 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.

Key words: Heavy ion irradiation, Nuclear graphite, Quinoline insoluble, Microstructure