| WANG Guo-qing,CAO Xin-xin,ZHAO Gai,SONG Jing-fu,DING Qing-jun.Effect of Groove on the Tribological Properties of Copper from a Nanoscale[J],52(3):134-142, 216 |
| Effect of Groove on the Tribological Properties of Copper from a Nanoscale |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.03.010 |
| KeyWord:molecular dynamics grooved surface copper nanotribological properties wear mechanism wear resistance |
| Author | Institution |
| WANG Guo-qing |
State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| CAO Xin-xin |
State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| ZHAO Gai |
State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing , China;State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Science, Lanzhou , China |
| SONG Jing-fu |
State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| DING Qing-jun |
State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| Nanotribological properties of smooth and grooved copper surface during sliding processes were investigated by molecular dynamics (MD) simulation to understand the friction and wear mechanisms of copper stator for ultrasonic motor (USM) from an atomic dimension. In this study, A diamond-copper friction coupling model was established and embedded- atom (EAM) potential was adopted as a force field describing intermolecular forces. Firstly, the influence of diamond penetration depth on friction and wear of copper matrix was studied. Importantly, the influence of groove angle, depth, and width on the nanotribological property of the diamond-copper system was studied. Meanwhile, the friction reduction mechanism of the groove texture on copper was revealed by extracting and analyzing the friction coefficient, the interaction force between the atoms, interface temperature, the energy of system and the friction morphology during the friction process from nano scale. For the without-texture copper surface, the friction coefficient and wear rate increase with the increase of diamond penetration depth. According to the friction morphology, the wear becomes more serious with the increase of the penetration depth. The friction coefficient increased from 0.3 to about 0.57 and the number of worn atoms also showed a trend of rapid increase in the same groove depth and width. The interface temperature increased from nearly 317 K to 328 K. The main reason for the decrease of friction coefficient and wear rate was that the atoms squeezed and ploughed into each other were significantly reduced during the process of diamond and copper matrix friction interaction owing to the existence of groove texture. 90° grooved texture had the optimal effect on reducing friction and wear compared with other angles. The number of worn atoms at other angles was almost the same, and the 90° grooved texture had a significant decrease compared to them. Newtonian layers of 90° grooved texture were lower than those with other angles, and there was no significant difference in temperature variation between textures with other angles. Besides, the coefficient of friction and wear rate decreased with an increase of the groove depth. As the groove depth increased, the wear condition gradually eased according to the friction morphology in the same groove angle and width. In the process of increasing the groove depth from 0nm to 0.8 nm, the number of worn atoms was reduced by nearly 78%, friction coefficient dropped from 0.57 to 0.46. In addition, van der Waals force decreased from about 35 nN to 20 nN, decreasing by 42.8%. In this case, the interface temperature dropped from 327 K to 318 K. The change of groove width was similar to the trend of groove depth. Therefore, the grooved surface can help improve the nanotribological performance and alleviate the wear on the copper surface. Increasing the penetration depth not only can increase the friction, but also produce severe wear in the form of material pile-up. Grooved angle has a great influence on friction and wear caused by the distribution of copper atoms. This study will provide theoretical guidance for exploring the wear mechanism of the textured copper surface from a nanoscale. |
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