基于SAXS方法的核石墨微孔结构的温度影响

戚威; 夏汇浩; 张灿; 宋金亮; 怀平; 周兴泰

doi:10.11889/j.0253-3219.2017.hjs.40.100103

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基于SAXS方法的核石墨微孔结构的温度影响

同步辐射技术及应用 | 更新时间：2021-05-19

- 基于SAXS方法的核石墨微孔结构的温度影响
- Effect of temperature on the microporous structure of nuclear graphite studied by SAXS
- 核技术 2017年40卷第10期文章编号：100103
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800
  2.中国科学院大学北京 100049
- 作者简介：
  
  [ "戚威, 男, 1988年出生, 2012年毕业于青岛大学, 现为博士研究生, 研究方向为碳材料评估", "QI Wei, male, born in 1988, graduated from Qingdao University in 2012, doctoral student, focusing on evaluation of carbon materials" ]
  夏汇浩, E-mail:xiahuihao@sinap.ac.cn XIA Huihao, E-mail:xiahuihao@sinap.ac.cn
- 基金信息：
  
  国家自然科学基金(11305240);国家自然科学基金(51602336)
- DOI：10.11889/j.0253-3219.2017.hjs.40.100103
  中图分类号： TL99
- 收稿日期：2017-05-16，
  
  修回日期：2017-06-01，
  
  纸质出版日期：2017-10
- 稿件说明：
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戚威, 夏汇浩, 张灿, 等. 基于SAXS方法的核石墨微孔结构的温度影响[J]. 核技术, 2017,40(10):100103

Wei QI, Huihao XIA, Can ZHANG, et al. Effect of temperature on the microporous structure of nuclear graphite studied by SAXS[J]. Nuclear techniques, 2017, 40(10): 100103
戚威, 夏汇浩, 张灿, 等. 基于SAXS方法的核石墨微孔结构的温度影响[J]. 核技术, 2017,40(10):100103 DOI： 10.11889/j.0253-3219.2017.hjs.40.100103.

Wei QI, Huihao XIA, Can ZHANG, et al. Effect of temperature on the microporous structure of nuclear graphite studied by SAXS[J]. Nuclear techniques, 2017, 40(10): 100103 DOI： 10.11889/j.0253-3219.2017.hjs.40.100103.

摘要

X射线小角散射（Small Angle X-ray Scattering，SAXS）是研究纳米尺度微观结构的重要手段。本文利用同步辐射SAXS技术测量了25℃、100℃、200℃、300℃和400℃时，IG-110和NBG-18核石墨在纳米尺度范围内孔隙的数量分布及其分形特征的变化。实验结果表明，IG-110和NBG-18核石墨的微观结构中存在微小尺寸上的不均匀区域，且核石墨孔隙的固气结构具有明锐的界面。但随着温度的升高，固气界面的变化并没有呈现出明显的规律性。此外，在纳米尺度上，IG-110和NBG-18核石墨的孔隙数量随温度呈现增加的趋势，且IG-110核石墨孔隙数量的增加幅度大于NBG-18核石墨，其平均孔隙尺寸的减小幅度大于NBG-18核石墨。在核石墨的微孔结构内，其固气界面的分形维数随温度升高逐渐减小，且NBG-18核石墨分形维数的变化幅度小于IG-110核石墨。这表明核石墨的分形结构随温度的升高逐渐光滑。

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.

关键词

Keywords

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