Impact of Boron Nitride Nanoparticles on the Wear Property of Lithium Base Grease
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JMEPEG https://doi.org/10.1007/s11665-020-05008-0
Impact of Boron Nitride Nanoparticles on the Wear Property of Lithium Base Grease Tao Wang, ZhanJun Li, JingBin Li, and Qiang He (Submitted April 22, 2020; in revised form June 13, 2020) In order to satisfy the requirement of lubrication under extreme working conditions (e.g., heavy load, high speed, and high temperature), a lubricating grease containing boron nitride (BN) nanoparticles was prepared by ultrasonic dispersion. And the effect of different content of nanoboron nitride on the tribological properties of lubricating grease was studied by means of a four-ball friction tester. The results showed that the grease containing 0.60 wt.% BN nanoparticles had the best anti-friction performance, as well as the smallest friction coefficient and wear scar radius. Additionally, a Raman spectrometer, scanning electron microscope, and three-dimensional profilometer were used to analyze the chemical composition, characterize the morphology of the wear scar in the steel balls after the friction tests, and the analysis results show that BN nanoparticles can not only produce lubricating film to protect friction pairs, but also its layered structure is easy to cause sliding of the friction pairs under the action of friction. Therefore, under the synergism of lubricating film and layered structure, the friction coefficient is obviously reduced and the friction reduction performance of grease is improved. Keywords
boron nitride, friction test, nanoparticles, wear properties
lithium
grease,
1. Introduction Friction and wear have always been one of the most important reasons for the energy consumption and physical failure of mechanical equipment. Lubricating grease is used to improve the friction and wear performance among mechanical components, and prolong the lifespan of machinery and equipment (Ref 1-3). However, traditional greases cannot satisfy the requirements of harsh working conditions, including heavy loading, high temperature, and high speed. Therefore, it is imperative to further improve the anti-friction, anti-wear, and extreme pressure properties of lubricating greases, and therefore improve the tribological properties of equipment (Ref 4, 5). Currently, nanomaterials have been widely applied to enhance grease properties, because they have extreme pressure resistance, outstanding wear resistance and environmental friendliness (Ref 6-11). Known by its non-toxicity, non-pollution, and excellent heat resistance, boron nitride (BN) has been extensively used as an additive in lubricating grease with outstanding anti-friction performance (Ref 12, 13). It is worth noting that the impact of additives on the structure and wear property of lubricating greases should be fully investigated.
Tao Wang, Department of Mechanical Engineering, Anyang Institute of Technology, Anyang 455000, China; and College of Mechanical Electrical Engineering, Shihezi University, Shihezi 832000, China; ZhanJun Li and Qiang He, Department of Mechanical Engineering, Anyang Institute of Technology, An
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