Effect of Temperature on Mechanical Propertiesof Carbon Nanotubes-Reinforced Nickel Nano-Honeycombs
Received date: 2019-09-10
Revised date: 2019-10-10
Online published: 2020-02-17
Supported by
National Natural Science Foundation of China(11772145);National Natural Science Foundation of China(11372126)
Nickel nano-honeycombs (NNHC) would be expected to an ideal anode material for solid oxide fuel cells (SOFC) because of its high surface area and highly ordered pore network. But, the anode material requires excellent mechanical properties to withstand stresses that arise during processing and service at different temperatures. The influence of temperature on the mechanical behaviors under radial (y axis) tension, radial compression, axial (z axis) tension and axial compression, is investigated by molecular dynamics (MD) by taking the carbon nanotubes (CNT)-reinforced NNHC (CRNNHC) composites with the mass fractions of CNT (ωCNT) of 5.22‰ and its corresponding NNHC as the example. The results show that the mechanical properties including elastic modulus(E) and ultimate stress (σu)in NNHC and CRNNHC both decrease approximately linearly with the increase of temperature. Compared to NNHC, the addition of CNT has no obvious effect on the enhancement of radial mechanical properties of CRNNHC under different temperatures, but it results in a good reinforced effect on axial mechanical properties. While the axial tensile and compressive elastic moduli can be increased by 6.4%~10% and 9%~12% respectively, and the ultimate stress can be increased by 1.5%~5.3% and 10%~14% respectively. The study indicates that axial mechanical properties of the CRNNHC are generally superior to their radial mechanical properties, and the energy absorption before the axial deformation is relatively larger due to the existence of CNT.
Yuancai LI , Wugui JIANG , Yu ZHOU . Effect of Temperature on Mechanical Propertiesof Carbon Nanotubes-Reinforced Nickel Nano-Honeycombs[J]. Acta Metall Sin, 2020 , 56(5) : 785 -794 . DOI: 10.11900/0412.1961.2019.00299
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