| YIN Zhenyu,ZHANG Lixiu,LI Shuai,ZHANG Ke,LI Songhua,WANG Junhai,WANG Liyan.Enhancing Tribological Performance of Ceramic Friction Pairs through Silver/Polydopamine Modified Graphene Oxide[J],53(13):151-163 |
| Enhancing Tribological Performance of Ceramic Friction Pairs through Silver/Polydopamine Modified Graphene Oxide |
| Received:June 10, 2023 Revised:January 03, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.13.015 |
| KeyWord:ceramic friction pair polydopamine friction performance nanocomposites dispersion stability molecular dynamics simulation |
| Author | Institution |
| YIN Zhenyu |
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang , China |
| ZHANG Lixiu |
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang , China |
| LI Shuai |
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang , China |
| ZHANG Ke |
Shenyang University of Technology, Shenyang , China |
| LI Songhua |
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang , China |
| WANG Junhai |
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang , China |
| WANG Liyan |
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang , China |
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| Abstract: |
| According to the self-polymerization ability of dopamine in weak alkaline environment, silver/poly-dopamine modified graphene oxide (Ag/PGO) nanocomposites were prepared by one-step method as lubricating oil additives, and the dispersion stability of lubricating oil containing Ag/PGO and its lubrication properties in ceramic friction pairs were studied. Nano-composite particles doped with spherical metal Ag based on layered graphene structure had unique synergistic effect. On the one hand, spherical nanoparticles could enter graphene lamellae, which reduced the aggregation of graphene lamellae caused by van der Waals force attraction and improved the dispersion stability of Ag/PGO in lubricating oil. On the other hand, the layered graphene structure in Ag/PGO nanoparticles was more easily adsorbed on the friction surface, and the spherical nano-Ag particles entered the friction contact area under the friction to form support and ball bearing function, and the synergistic effect between the layered graphene structure and spherical nano-Ag improved the lubrication performance of lubricating oil. PGO could be stably dispersed in lubricating oil for 25 days and Ag/PGO could be stably dispersed in lubricating oil for 10 days. The best mass fraction of lubricating oil containing Ag/PGO in Si3N4/Si3N4 friction pair was 0.05%, and the friction coefficient and wear mark width were reduced by 16.8% and 17.6% respectively. The optimum mass fraction of Si3N4/GCr15 friction pair was 0.2%, and the friction coefficient and wear mark width were reduced by 53.6% and 22.7% respectively. The worn surface of lubricating oil containing additives was characterized by scanning electron microscope and ultra-depth-of-field microscope. The results showed that the wear surface of base oil was basically the same as the matrix material, indicating that no friction protective film was formed, and the friction coefficient and wear width were the largest. Compared with other additives, the surface of wear scar containing Ag/PGO additive had black deposition layer and was relatively smooth, and irregular pits were alleviated, which showed that the adsorption film formed by Ag/PGO deposition had anti-wear effect. Based on Materials studio (MS) 7.0 software, the molecular models of shear and adsorption of lubricating oil containing Ag/PGO in Si3N4/Si3N4 and Si3N4/GCr15 friction pairs were constructed respectively, and the shear and adsorption properties of lubricating oil containing additives were simulated respectively, and the lubrication mechanism of lubricating oil containing Ag/PGO was studied. The results showed that the interaction between Ag/PGO nanoparticles and C16H34 molecules could reduce the adsorption between oil film and friction wall, and reduce the shear deformation and friction resistance of oil film. Through the synergistic effect of Ag nanoparticles and PGO, more C16H34 molecules were adsorbed on the walls of Si3N4 and GCr15 with Ag/PGO nanoparticles, showing good adsorption performance. Compared with the wall of Si3N4, the lubricating oil containing additives was more easily adsorbed on the wall of GCr15. Therefore, the lubricating oil containing Ag/PGO shows better lubrication performance in Si3N4/GCr15 friction pair. The lubrication mechanism of lubricating oil containing Ag/PGO is obtained, that is, through the synergistic effect of lubricating oil, nano-Ag and Ag/PGO nano-particle adsorption film, the lubricating oil containing Ag/PGO has the best lubrication performance in two kinds of friction pairs. |
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