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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 5 more authors.
Applied Surface Science | Year: 2015

3 MeV Xe20+ ion irradiation experiments were performed on the Cr/W multilayer films to investigate the evolution of surface morphology and mechanical properties. Results showed that the W layer in the as-deposited pure W and Cr/W multilayer films are simple cubic structure, but it is not stable under ions irradiation. After exposure to 2.14 × 1018 m-2 Xe ions irradiation, the W layer has completely transformed into the bcc structure. For surface morphology characterization, serious swelling effects were observed in the pure W films. Compared with the pure W films, the Cr/W multilayer films showed much better resistance against the irradiation-induced swelling. Meanwhile, the decrease of hardness and Young's modulus of the Cr/W multilayer films was also less than the pure W films. Results of surface morphology and mechanical tests suggested that radiation tolerance of the Cr/W multilayer films is significantly better than the pure W films. © 2015 Elsevier B.V. All rights reserved. Source


Chai 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 | Ni M.,Nanjing University of Aeronautics and Astronautics | And 5 more authors.
Journal of Applied Polymer Science | Year: 2016

Novel, flexible, lead-free X-ray-shielding composites were prepared with a high-functional methyl vinyl silicone rubber (VMQ) matrix with W and Bi2O3 as filler materials. To verify the advanced properties of the lead-free material, composites with the same mass fraction of PbO were compared. With the X-ray energy ranging from 48 to 185 keV, the W/Bi2O3/VMQ composites exhibited higher X-ray-shielding properties. As the filler volume fraction decreased, the tensile strength, elongation, tear strength, and flexibility of the W/Bi2O3/VMQ composites increased. The Shore hardness of the W/Bi2O3/VMQ composites had a maximum value of 46.6 HA and was still very flexible. With decreasing filler volume fraction, the water-vapor transmission performances of the W/Bi2O3/VMQ composites increased, and the W/Bi2O3/VMQ composites also showed better water-vapor permeability. The heat-transfer properties of the W/Bi2O3/VMQ composites increased with increasing W content, and when the W content exceeded 70 wt %, the thermal conductivity of the W/Bi2O3/VMQ material was about 70.45% higher than that of the PbO/VMQ composite. © 2015 Wiley Periodicals, Inc. Source


Chai 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 | Ni M.,Nanjing University of Aeronautics and Astronautics | And 5 more authors.
Journal of Nuclear Materials | Year: 2015

Flexible flame-retardant composites were prepared using high-functional methyl vinyl silicone rubber matrix with B4C, hollow beads, and zinc borate (ZB) as filler materials. As filler content increased, the tensile strength, elongation, and tear strength of the composites initially increased and then decreased. The shore hardness of the composites increased with increasing filler content with a maximum value of 30 HA. The heat insulation properties of the composites with hollow beads were higher than that of the ordinary composites with the same filler mass fraction. When ZB content exceeded 12 wt%, the limit of oxygen index of the composites was higher than 27.1%. With Am-Be neutron as the test radiation source, the transmission of neutron for a 2 cm sample was only 47.8%. Powder surface modification improved the mechanical properties, thermal conductivity, flame retardancy, and neutron shielding performance of the composites, but did not affect shore hardness. © 2015 Elsevier B.V.All rights reserved. Source


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. Source


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Zhongxing Energy Equipment CO. | Date: 2015-09-30

Steel strip; stainless steel pipes; stainless steel tube rods; steel pipes.

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