温度对碳纳米管增强纳米蜂窝镍力学性能的影响
收稿日期: 2019-09-10
修回日期: 2019-10-10
网络出版日期: 2020-02-17
基金资助
国家自然科学基金项目(11772145);国家自然科学基金项目(11372126)
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)
选取含质量分数为5.22‰碳纳米管(CNT)为代表，通过分子动力学(MD)研究了温度对纳米蜂窝镍(NNHC)和CNT增强纳米蜂窝镍(CRNNHC)在径向拉伸、径向压缩、轴向拉伸和轴向压缩下力学性能的影响。结果表明，NNHC和CRNNHC的弹性模量(E)和最终应力(σu)对温度较为敏感，都随温度升高呈近似线性下降。相比于NNHC，不同温度下CNT的添加对CRNNHC径向力学性能的增强效果并不明显，而对其轴向力学性能则起到了良好的增强作用。CRNNHC轴向拉伸与压缩时的弹性模量提升幅值分别为6.4%~10%与9%~12%，最终应力提升幅值分别为1.5%~5.3%与10%~14%。研究表明，不同温度下CRNNHC沿轴向变形的力学性能普遍要优于沿径向变形的力学性能，也预示着轴向变形时CNT被破坏前吸收的能量相对较多。
关键词： 纳米蜂窝镍; 碳纳米管增强纳米蜂窝镍; 力学性能; 分子动力学; 温度效应
李源才 , 江五贵 , 周宇 . 温度对碳纳米管增强纳米蜂窝镍力学性能的影响[J]. 金属学报, 2020 , 56(5) : 785 -794 . DOI: 10.11900/0412.1961.2019.00299
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.
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