Abstract
A ball-on-plate wear test was employed to investigate the effectiveness of graphene (GP) nanoparticles dispersed in a synthetic-oil-based lubricant in reducing wear. The effect by area ratio of elliptically shaped dimple textures and elevated temperatures were also explored. Pure PAO4 based oil and a mixture of this oil with 0.01 wt% GP were compared as lubricants. At pit area ratio of 5%, GP-base oil effectively reduced friction and wear, especially at 60 and 100°C. Under pure PAO4 oil lubrication, the untextured surfaces gained low friction coefficients (COFs) and wear rates under 60 and 100°C. With increasing laser—texture area ratio, the COF and wear rate decreased at 25 and 150°C but increased at 60 and 100°C. Under the GP-based oil lubrication, the textured surface with 5% area ratio achieved the lowest COF among those of the area ratios tested at all test temperatures. Meanwhile, the textured surface with 20% area ratio obtained the highest COF among those of the area ratios. With the joint action of GP and texture, the textured surface with 10% area ratio exhibited the best anti-wear performance among all of the textured surfaces at all test temperatures.
Highlights
Graphene (GP) is a monolayer of graphite (2D) and is the basic building block of all graphitic forms, such as fullerenes (0D), carbon nanotubes (1D), and graphite (3D) [1]
The surface texture significantly influenced the coefficient of friction (COF) under pure PAO lubrication (Fig 5)
100°C, the COFs obtained from testing the dimpled plate exhibited a sharp increase at the beginning of the test, followed by a steady decrease after reaching a peak value
Summary
Graphene (GP) is a monolayer of graphite (2D) and is the basic building block of all graphitic forms, such as fullerenes (0D), carbon nanotubes (1D), and graphite (3D) [1]. Only a few studies on the tribological applications of GP have been reported, the addition of nano-GP particles into lubricating oil [5]. Textured Patterns and Graphene Additives Tribological Behavior lubrication. One is adding a dispersant, which leads to a uniform dispersion of GP in oil Another is modifying the surface appropriately to enhance the lipophilic property of GP. To improve the effective functioning of two friction surfaces, lubricants with additives are required. Surface texturing is another efficient approach to improve the interface [11,12,13]. The combined effect of surface textures and additives on friction interfaces is worth studying and exploring. Tribology tests were carried out under different test conditions, and the interaction between the textured surface and additive was investigated
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