Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering

Nanjing, China

Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering

Nanjing, China
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Liu J.,Nanjing University of Aeronautics and Astronautics | Tang X.,Nanjing University of Aeronautics and Astronautics | Tang X.,Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering | Li Y.,Nanjing University of Aeronautics and Astronautics | And 7 more authors.
Materials Chemistry and Physics | Year: 2017

In consideration of the ubiquity of swift particles in space environment, understanding the effects of ion irradiation on the adhesion force and mechanical properties of multi-walled carbon nanotube arrays is significant to apply the arrays as adhesive materials in space in the future. In this study, multi-walled carbon nanotube arrays prepared through chemical vapor deposition were irradiated by He2+ under different fluences and then characterized via multiple methods. The arrays were severely damaged when the fluence reached or exceeded 1 × 1016 cm−2. As the fluence increased, more amorphous carbons were generated from their original position in the carbon nanotubes. The adhesion force quickly decreased when the irradiation fluence rapidly increased, which limited the service life of the arrays as adhesive materials. Finally, the instantaneous modulus of the multi-walled carbon nanotube arrays initially increased and then decreased when the fluence increased because of the different contact modes between the indenter and the samples. © 2017 Elsevier B.V.


Huang H.,Nanjing University of Aeronautics and Astronautics | Tang X.,Nanjing University of Aeronautics and Astronautics | Tang X.,Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering | Chen F.,Nanjing University of Aeronautics and Astronautics | And 3 more authors.
Journal of Nuclear Materials | Year: 2017

Metal–graphene nanocomposites are expected to have excellent radiation resistance. The intrinsic role of the graphene layers (GrLs) in their performance has not been fully understood. Five copper–graphene nanocomposite (CGNC) systems were used to investigate the detailed mechanisms underpinning this behaviour by atomistic simulation. Results showed that GrLs can reduce the formation, growth, and intensity of the thermal spike of CGNC; this effect became more evident with the increasing number of layers of graphene. The role of the GrLs can be explained by three mechanisms: first, the ultra-strength C–C bonds of graphene hindered the penetration of high-energy atoms, second, the number of recoiled atoms decreased with the increasing number of layers of graphene, and third, the energy dissipation along the graphene planes also indirectly weakened the damage caused to the entire system. These mechanisms may provide a pathway to prevent material degradation in extreme radiation environments. © 2017 Elsevier B.V.


Chen T.,Nanjing University of Aeronautics and Astronautics | Tang X.,Nanjing University of Aeronautics and Astronautics | Tang X.,Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering | Chen F.,Nanjing University of Aeronautics and Astronautics | And 5 more authors.
Journal of Radiological Protection | Year: 2017

Radiation shielding of high-energy electrons is critical for successful space missions. However, conventional passive shielding systems exhibit several limitations, such as heavy configuration, poor shielding ability, and strong secondary bremsstrahlung radiation. In this work, an aluminum/vacuum multilayer structure was proposed based on the electron return effects induced by magnetic field. The shielding property of several configurations was evaluated by using the Monte Carlo method. Results showed that multilayer systems presented improved shielding ability to electrons, and less secondary x-ray transmissions than those of conventional systems. Moreover, the influences of magnetic flux density and number of layers on the shielding property of multilayer systems were investigated using a female Chinese hybrid reference phantom based on cumulative dose. In the case of two aluminum layers, the cumulative dose in a phantom gradually decreased with increasing magnetic flux density. The maximum decline rate was found within 0.4-1 Tesla. With increasing layers of configuration, the cumulative dose decreased and the shielding ability improved. This research provides effective shielding measures for future space radiation protection in high-energy electron environments. © 2017 IOP Publishing Ltd.


Chen T.,Nanjing University of Aeronautics and Astronautics | Chen F.,Nanjing University of Aeronautics and Astronautics | Tang X.,Nanjing University of Aeronautics and Astronautics | Tang X.,Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering | And 3 more authors.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2017

Shielding against spatial high-energy electron radiation is essential to the success of space exploration. Honeycomb and foam systems, combined with a magnetic field, were proposed to shield against spatial high-energy electrons given the immense mass and large amount of secondary X-rays of a passive shield and the demand for a high-intensity magnetic field of an active method. The shielding capabilities of several structures were investigated using the Monte Carlo method. The influences of magnetic flux density and hollow cube size on shielding property were studied by simulating energy deposition in a Chinese male reference phantom. Results showed that the honeycomb and foam systems enhanced the shielding capability against high-energy electrons and reduced the penetration of secondary X-rays. The effective dose in the male phantom decreased with increasing magnetic flux density. The proposed structures exhibited excellent shielding capabilities with a small hollow cube. In addition, the foam structure performed better than the honeycomb structure. Thus, the presented systems may be used for space radiation protection in a high-energy electron environment. © 2017 Elsevier B.V.


Wang P.,Nanjing University of Aeronautics and Astronautics | Tang X.,Nanjing University of Aeronautics and Astronautics | Tang X.,Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering | Chai H.,Nanjing University of Aeronautics and Astronautics | And 3 more authors.
Fusion Engineering and Design | Year: 2015

The design and fabrication of shielding materials with good heat-resistance and mechanical properties is a major problem in the radiation shielding field. In this paper, based on gamma ray and neutron shielding theory, a continuous carbon-fiber reinforced Sm2O3/polyimide gamma ray/neutron shielding material was fabricated by hot-pressing method. The material's application behavior was subsequently evaluated using neutron shielding, photon shielding, mechanical tensile, and thermogravimetric analysis-differential scanning calorimetry tests. The results show that the tensile strength of the novel shielding material exceeds 200MPa, which makes it of similar strength to aluminum alloy. The material does not undergo crosslinking and decomposition reactions at 300°C and it can be used in such environments for long periods of time. The continuous carbon-fiber reinforced Sm2O3/polyimide material has a good shielding performance with respect to gamma rays and neutrons. The material thus has good prospects for use in fusion reactor system and nuclear waste disposal applications. © 2015 Elsevier B.V.


Chen F.,Nanjing University of Aeronautics and Astronautics | Tang X.,Nanjing University of Aeronautics and Astronautics | Tang X.,Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering | Huang H.,Nanjing University of Aeronautics and Astronautics | And 7 more authors.
ACS Applied Materials and Interfaces | Year: 2016

Cr/W multilayer nanocomposites were presented in the paper as potential candidate materials for the plasma facing components in fusion reactors. We used neutron reflectometry to measure the depth profile of helium in the multienergy He ions irradiated [Cr/W (50 nm)]3 multilayers. Results showed that He-rich layers with low neutron scattering potential energy form at the Cr/W interfaces, which is in great agreement with previous modeling results of other multilayers. This phenomenon provided a strong evidence for the He trapping effects of Cr/W interfaces and implied the possibility of using the Cr/W multilayer nanocomposites as great He-tolerant plasma facing materials. © 2016 American Chemical Society.


Liu J.,Nanjing University of Aeronautics and Astronautics | Tang X.,Nanjing University of Aeronautics and Astronautics | Tang X.,Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering | Chen F.,Nanjing University of Aeronautics and Astronautics | And 4 more authors.
Diamond and Related Materials | Year: 2016

It is of great significance to provide theoretical guidance to the application of carbon nanotubes as adhesive materials via the investigation on their adhesion force. In this paper, molecular dynamics was adopted to investigate the adhesion force between the graphene substrate and the carbon nanotubes with varying deformation degrees and diverse types of irradiation induced defects at different temperatures. No obvious adhesion force was found between the carbon nanotube and graphene until the deformation degree of the former reached > 70%. The adhesion force would be maintained at a high level when the temperature was in the range of 280–320 K, which limited its application. Moreover, the adhesion force between carbon nanotube with vacancies and graphene substrate would decrease with increasing size of vacancies. Finally, compared with monovacancies and divacancies, Stone-Wales defects most remarkably reduced the adhesion force of carbon nanotubes. © 2016 Elsevier B.V.


Li H.,Nanjing University of Aeronautics and Astronautics | Tang X.,Nanjing University of Aeronautics and Astronautics | Tang X.,Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering | Chen F.,Nanjing University of Aeronautics and Astronautics | And 4 more authors.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2016

The radiation damage and microstructure evolution of different zigzag single-walled carbon nanotubes (SWCNTs) were investigated under incident carbon ion by molecular dynamics (MD) simulations. The radiation damage of SWCNTs under incident carbon ion with energy ranging from 25 eV to 1 keV at 300 K showed many differences at different incident sites, and the defect production increased to the maximum value with the increase in incident ion energy, and slightly decreased but stayed fairly stable within the majority of the energy range. The maximum damage of SWCNTs appeared when the incident ion energy reached 200 eV and the level of damage was directly proportional to incident ion fluence. The radiation damage was also studied at 100 K and 700 K and the defect production decreased distinctly with rising temperature because radiation-induced defects would anneal and recombine by saturating dangling bonds and reconstructing carbon network at the higher temperature. Furthermore, the stability of a large-diameter tube surpassed that of a thin one under the same radiation environments. © 2016 Elsevier B.V. All rights reserved.


Wang P.,Nanjing University of Aeronautics and Astronautics | Wang P.,Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering | Tang X.,Nanjing University of Aeronautics and Astronautics | Tang X.,Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering | And 4 more authors.
Nuclear Engineering and Design | Year: 2015

A novel LiF, Sm2O3, Gd2O3/carbon fibre/polyimide material was designed in order to improve the neutron absorbing performance of the spent fuel storage basket in this paper. The volume fraction of three kinds of neutron absorbers (LiF, Sm2O3and Gd2O3) in polyimide was optimised by Monte Carlo method. Calculation results showed that the novel neutron-absorbing material, in which the volume ratio of LiF, Sm2O3and Gd2O3 was 1:2:13, can achieve the best absorption capacity. Based on the calculated results, the basket material was fabricated by compression moulding, and its mechanical behaviour, thermal behaviour, and irradiation resistant behaviour were evaluated, respectively. The experimental results proved that the tensile strength of the novel neutron-absorbing material was between 195 and 346 MPa and the maximum service temperature was up to 300 °C. Gamma irradiation dose was limited to 160 kGy, the bending strength of the material kept increasing from 10 to 19 MPa. © 2014 Elsevier B.V. All rights reserved.


Chen F.,Nanjing University of Aeronautics and Astronautics | Tang X.,Nanjing University of Aeronautics and Astronautics | Tang X.,Jiangsu Key Laboratory of Nuclear Energy Equipment Materials Engineering | Yang Y.,Nanjing University of Aeronautics and Astronautics | And 5 more authors.
Journal of Nuclear Materials | Year: 2016

We investigated the radiation damage resistance of the Fe/Ni multilayer nanocomposites by molecular dynamics. In the paper, two types of interface configuration with different orientation relationship were constructed. Their morphology evolution and number of final surviving defects induced by cascade collisions were discussed respectively. The interfaces of the two types of Fe/Ni multilayers kept distinct during the long-time relaxation before cascade. The comparison of surviving defects number produced by PKA with 5 keV at 100 K showed that the Fe/Ni multilayers have greater radiation tolerance than that of the bulk materials. However, the orientation relationship of the interface influences the defects self-healing capability greatly when the multilayers are irradiated by higher energy PKA or at high temperature. The radiation damage resistance of the Nishiyama - Wassermann type Fe/Ni multilayers which have larger lattice misfit is more stable than that of the Kurdjumov - Sachs type. © 2015 Elsevier B.V.

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