Journal
TRIBOLOGY INTERNATIONAL
Volume 151, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2020.106493
Keywords
Nanoparticles; Lubricated friction; MD simulations; In situ TEM
Categories
Funding
- project OP VVV Novel nanostructures for engineering applications [CZ.02.1.01/0.0/0.0/16026/0008396]
- Ministry of Education, Youth and Sports from the Large Infrastructures for Research, Experimental Development and Innovations project IT4lnnovations National Supercomputing Center [LM2015070]
- Ministry of Education and Science of the Russian Federation [K2-2020-004]
- MEYS CR [LM2018110]
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Hexagonal boron nitride (h-BN) nanosheets, spherical W nanoparticles, and their combinations were utilized as lubricant additives to synthetic PAO6 oil. The addition of W NPs led to a decrease in the coefficient of friction and wear rate. Molecular dynamics (MD) simulations and in situ TEM mechanical tests showed that the positive effect of adding spherical W NPs can be attributed to their rolling and sliding in the tribological contact zone. Adding BN nanosheets to PAO6 also improved the tribological performance of friction pairs: MD simulations suggest that the exfoliation and sliding of BN layers under tribological contact can contribute to the reduction of friction and wear. Moreover, a synergistic effect from the simultaneous addition of W and BN nanoparticles was observed: the CoF and wear reached minimum values among all tested suspensions. The formation of W/BN core/shell structures by wrapping of W nanoparticles by h-BN sheets provided superior macroscale lubricity.
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