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PLoS One. 2016 Apr 7;11(4):e0152143. doi: 10.1371/journal.pone.0152143. eCollection 2016.

Combined Effect of Textured Patterns and Graphene Flake Additives on Tribological Behavior under Boundary Lubrication.

Author information

1
Key Lab of Advanced Technologies of Materials (Ministry of Education), Tribology Research Institute, Southwest Jiaotong University, Chengdu, 610031, China.
2
Mechanical Engineering Department, School of Engineering and Technology, China University of Geosciences (Beijing), 100083, China.

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.

PMID:
27054762
PMCID:
PMC4824447
DOI:
10.1371/journal.pone.0152143
[Indexed for MEDLINE]
Free PMC Article

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