The surface topography and microstructure of self-sintered nanopore graphite by Xe ions irradiation

Zhang, Heyao; Song, Jinliang; Tang, Zhongfeng; Zhu, He; Liu, Xiangdong

doi:10.1016/j.apsusc.2020.146022

Cited by 11 publications

(6 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the total amount of incoming diffusion material is equal to the increase of diffusion material in the cell, equation ( 8) is obtained from equations ( 4), ( 5), (6), and (7).…”

Section: = −mentioning

confidence: 99%

“…A series of graphite with pore sizes below 100 nm was prepared in our research group. In particular, self-sintered nanopore-isotropic graphite (SSNG) prepared from green pitch coke by the isostatic pressing method has a high graphitization degree and good irradiation properties [5,6], with Disclaimer/Publisher's Note: The statements, opinions, and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions, or products referred to in the content.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of the Diffusion Coefficient of Xenon in Self-Sintered Nanopore Graphite for Molten Salt Reactor

Li,

Lei,

Zhang

et al. 2023

Preprint

View full text Add to dashboard Cite

The economics and safety of reactors can be affected by the diffusion of fission products into graphite. Xenon (Xe) fission products diffusing into the graphite is the most critical neutron absorber and poison that can slow down or stop the chain reaction. The transport parameters for inhibiting the xenon diffusion in graphite are therefore the utmost scientific problem. Self-sintered nanopore-isotropic (~ 40nm) graphite (SSNG) derived from green pitch coke can decrease Xe diffusion into the graphite. In this study, a method for measurement of diffusion coefficients of fission products diffusion in graphite by Rutherford backscattering spectrometry (RBS) was reported. The SSNG substrates were implanted with Xe at a dose of 4.8×1015 ions/cm2 and energy of 7 MeV. The RT-implanted samples were annealed in a vacuum at 650°C for 9 h. The implanted and annealed samples were characterized by RBS. The diffusion coefficient D(Xe,650°C) is 6.49×10-20 m2/s. The results indicate the excellent ability to inhibit Xe diffusion of the SSNG and present significance in designing and evaluating the safety of nuclear reactors.

show abstract

“…If the total amount of incoming diffusion material is equal to the increase of diffusion material in the cell, equation ( 8) is obtained from equations ( 4), ( 5), (6), and (7).…”

Section: = −mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of the Diffusion Coefficient of Xenon in Self-Sintered Nanopore Graphite for Molten Salt Reactor

Li,

Lei,

Zhang

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…For a onedimensional diffusion process, the diffusion coefficient can be defined as the rate of transfer of the diffusing substance within a segment of units, divided by the spatial gradient of the concentration at that segment. If the rectangular bars in Figure 1 represent SSNG graphite specimens implanted with Xe 26+ , Equation (5) can be solved using Equation (6) [29]: Suppose that at the center of the rectangular bar, i.e., P (x, y, z), the concentration of the substance is C. The mass of the diffuser entering the rectangular bar in the x-dx plane through the ABCD plane is 4dydz…”

Section: Elementmentioning

confidence: 99%

Section: Elementmentioning

confidence: 99%

“…A series of graphite with pore sizes below 100 nm was prepared by our research group. In particular, self-sintered nanopore-isotropic graphite (SSNG) prepared from green pitch coke using the isostatic pressing method has a high graphitization degree and good irradiation properties [5,6], with potential for use in MSRs. However, the diffusion behavior of implanted Xe in SSNG has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement of the Diffusion Coefficient of Xenon in Self-Sintered Nanopore Graphite for Molten Salt Reactor

Li,

Lei,

Zhang

et al. 2023

Self Cite

View full text Add to dashboard Cite

The economics and safety of reactors can be affected by the diffusion of fission products into graphite. Xenon (Xe) fission products diffusing into graphite is the most critical neutron absorber and poison that can slow down or stop the chain reaction. The transport parameters for inhibiting the xenon diffusion in graphite are therefore an important scientific problem. Self-sintered nanopore-isotropic (~40 nm) graphite (SSNG) derived from green pitch coke can decrease Xe diffusion into graphite. In this study, the surface morphology and microstructural evolution in graphite before and after irradiation, as well as after annealing, were studied with different characterization methods. A method for the measurement of diffusion coefficients of fission products’ diffusion in graphite using Rutherford backscattering spectrometry (RBS) was also reported. The SSNG substrates were implanted with Xe at a dose of 4.8 × 1015 ions/cm2 and energy of 7 MeV. The RT-implanted samples were annealed in a vacuum at 650 °C for 9 h. The implanted and annealed samples were characterized using RBS. The diffusion coefficient D (Xe, 650 °C) was 6.49 × 10−20 m2/s. The results indicate SSNG’s excellent ability to inhibit Xe diffusion and are significant for designing and evaluating the safety of nuclear reactors.

show abstract

The surface topography and microstructure change of densified nanopore nuclear graphite impregnated with polyimide and irradiated by xenon ions

Zhang

Song

Tang

et al. 2020

Applied Surface Science

View full text Add to dashboard Cite

The surface topography and microstructure of self-sintered nanopore graphite by Xe ions irradiation

Cited by 11 publications

References 37 publications

Measurement of the Diffusion Coefficient of Xenon in Self-Sintered Nanopore Graphite for Molten Salt Reactor

Measurement of the Diffusion Coefficient of Xenon in Self-Sintered Nanopore Graphite for Molten Salt Reactor

Measurement of the Diffusion Coefficient of Xenon in Self-Sintered Nanopore Graphite for Molten Salt Reactor

The surface topography and microstructure change of densified nanopore nuclear graphite impregnated with polyimide and irradiated by xenon ions

Contact Info

Product

Resources

About