|
|||||
|
|
Tribological and tribochemical properties of magnetite nanoflakes as additives in oil lubricants |
|
| Institution: | 1. College of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;2. Key Laboratory of Specially Functional Material under Ministry of Education, Guangzhou 510640, China;1. Centre for Bulk Solids and Particulate Technologies, Newcastle Institute for Energy and Resources, The University of Newcastle, Callaghan 2308, Australia;2. Faculty of Mechanical Engineering, Leibniz University of Hanover, Hanover 30159, Germany;1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China;2. CSIRO Materials Science and Engineering, P.O. Box 21, Belmont, Victoria 3216, Australia;1. Institut FEMTO-ST, DMA, UMR 6174, CNRS UFC ENSMM UTBM, F-25000 Besançon, France;2. Tribomaterials Group, The Ångström Laboratory, Uppsala University, SE-751 21 Uppsala, Sweden;3. Institut UTINAM, UMR 6213 CNRS, Université de Franche-Comté, F-25009 Besançon cedex, France;4. Materials Science, Dalarna University, SE-791 88 Falun, Sweden |
| Abstract: | This detailed the tribological and tribochemical properties of magnetite (Fe3O4) nanoflakes used as additives in #40 base oil in a four-ball tribo-tester. The average friction coefficient of the friction pair for lubricant containing the Fe3O4 nanoflakes of 1.5 wt% as a lubricant additive in the base oil is decreased by 18.06% compared to that of solely base oil. The chemical composition of base oil with the Fe3O4 nanoflake additives did not change during the 48-h friction assessment. The decreased saturation magnetization and increased coercivity of magnetite nanoflakes occurred due to the distortion of the basal planes and the presence of hematite (α-Fe2O3) generated by the tribochemical reactions during the friction process. The multi-layer low-shear-stress tribochemical lubrication films on the surface of the friction pair could form because the nanoflake particles arrange and adhere onto the surface of the friction pair in an orderly manner, and the tribochemical reactions of the friction pair in the presence of the nanoflakes occur as Fe → FeO → Fe3O4 → γ-FeOOH → γ-Fe2O3 → α-Fe2O3. The formation of the films can improve the tribological properties. |
| Keywords: | Nanoflake particles Magnetite Lubricant additive Tribology Tribochemical properties |
| 本文献已被 ScienceDirect 等数据库收录！ | |