Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (4): 40106-040106.doi: 10.11889/j.0253-3219.2019.hjs.42.040106

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Microstructure evolution of IG-110 nuclear graphite with salt infiltration revealed by in-situ tensile synchrotron-XRD

Jiamin WANG1,2,Shanglei FENG2,3(),Yingguo YANG2,3(),Yong WANG2,3,Xiangdong LIU1,Xingtai ZHOU2   

  1. 1. School of Physics and State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
    2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
    3. Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201204, China
  • Received:2018-12-26 Revised:2019-02-28 Online:2019-04-10 Published:2019-04-18
  • Contact: Shanglei FENG,Yingguo YANG E-mail:fengshanglei@sinap.ac.cn YANG Yingguo;fengshanglei@sinap.ac.cn;fengshanglei@sinap.ac.cn YANG Yingguo;yangyingguo@sinap.ac.cn
  • About author:<named-content content-type="corresp-name">WANG Jiamin</named-content>, female, born in 1992, graduated from Xinzhou Teachers University in 2016, master student, focusing on synchronous radiation characterization of carbon-based materials in molten salt reactors|<named-content content-type="corresp-name">WANG Jiamin</named-content>, female, born in 1992, graduated from Xinzhou Teachers University in 2016, master student, focusing on synchronous radiation characterization of carbon-based materials in molten salt reactors|FENG Shanglei, E-mail: <email>fengshanglei@sinap.ac.cn YANG Yingguo</email>, E-mail: <email>yangyingguo@sinap.ac.cn</email>|FENG Shanglei, E-mail: <email>fengshanglei@sinap.ac.cn YANG Yingguo</email>, E-mail: <email>yangyingguo@sinap.ac.cn</email>
  • Supported by:
    Supported by National Natural Science Foundation of China (No.11705271, No.U1632268, No.11605278, No.11775134, No.11375108), Shanghai Sailing Program (No.17YF1423700), Strategic Priority Research Program of Chinese Academy of Sciences (No.XDA02040200), Natural Science Foundation of Shandong Province(No.ZR2016CM02)

Abstract: Background

Nuclear graphite is easily impregnated by liquid molten salt under high pressure environment due to its porous structure, which will affect the mechanical properties of the nuclear graphite. In-situ real-time tensile synchrotron-based two dimensional X-ray diffraction (2D-XRD) plays an important role in exploring the interaction between graphite and molten salt.

Purpose

This study aims to reveal the in-situ real-time interaction mechanism between IG-110 nuclear graphite and FLiNaK molten salt and the microscopic mechanism of material fracture under the external stress load.

Methods

In-situ real-time tensile synchrotron-based 2D-XRD at several fixed external forces, i.e., 0 N, 15 N, 21 N, 27 N and 32 N, were implemented to reveal the microstructure evolution of IG-110 nuclear graphite and FLiNaK salt during the tensile fracture process.

Results

During the tensile fracture process, the (002) diffraction peak of IG-110 nuclear graphite infiltrated with molten salt presents an obvious shift to a lower q, a gradually decreasing peak intensity and a gradually increasing full width at half maximum (FWHM). Meanwhile, the diffraction peaks of the FLiNaK salt also present a gradually decreasing peak intensity.

Conclusion

In the process of tensile fracture, the larger the interlayer spacing, the worse the crystallinity of IG-110 nuclear graphite and FLiNaK salt are emerged.

Key words: Thorium molten salt reactor, IG-110 nuclear graphite, Molten salt impregnation, In-situ tensile synchrotron- based two dimensional X-ray diffraction

CLC Number: 

  • TL99