Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (10): 100103-100103.doi: 10.11889/j.0253-3219.2017.hjs.40.100103


Effect of temperature on the microporous structure of nuclear graphite studied by SAXS

QI Wei1,2, XIA Huihao1, ZHANG Can1, SONG Jinliang1, HUAI Ping1, ZHOU Xingtai1   

  1. 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-05-16 Revised:2017-06-01 Online:2017-10-10 Published:2017-09-29
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11305240, No.51602336)

Abstract: Background: The distribution of nanoscale pore is of great significance to irradiation damage behavior of nuclear graphite under intense radiation. Small angle X-ray scattering (SAXS) is an important method used to study the number distribution and its fractal characteristics of pore in nanoscale. Purpose: This study aims at the changes in number distribution and its fractal characteristics of nanoscale pore in nuclear graphite. Methods: Two typical nuclear graphite, i.e., IG-110 and NBG-18 were sampled and tested at synchrotron radiation SAXS beamline station at temperatures of 25℃, 100℃, 200℃, 300℃ and 400℃, respectively. Results: The results showed that there was a non-uniform area in the microstructure of nuclear graphite, and the solid-gas structure of the nuclear graphite pore had a sharp interface, but the change of solid-gas interface does not show obvious regularity with the increase of temperature. In addition, the number of nanoscale pore in IG-110 nuclear graphite increases with the temperature, and is more obvious than that of NBG-18. The fractal dimension of the solid-gas interface decreases with the temperature increasing, indicating that the fractal structure of the graphite become smoother with the increasing of temperature. And the change of IG-110 is more obvious than that of NBG-18. Conclusion: The temperature has a significant impact on the pore number distribution and its fractal characteristics.

Key words: Graphite, Microporous structure, SAXS

CLC Number: 

  • TL99