In-situ nanopolishing by nanolubricants for enhanced elastohydrodynamic lubrication

Mosleh, Mohsen; Shirvani, Khosro A.

doi:10.1016/j.wear.2013.01.056

Cited by 25 publications

(11 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, after &2 nm more sliding, the friction coefficient returns to the same as value before passing through the periodic boundary, suggesting that any atomic-scale roughness present on the surface will be removed by the nanoparticles and will have a negligible influence on the friction coefficient. This also indicates that surface polishing due to the presence of CNO and CND may be another contributor to low friction, as has been suggested previously from experimental results [12,16].…”

Section: Effect Of Nanoparticle Coveragesupporting

confidence: 80%

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

et al. 2016

View full text Add to dashboard Cite

For the successful development and application of novel lubricant additives, a full understanding of their tribological behaviour at the nanoscale is required, but this can be difficult to obtain experimentally. In this study, nonequilibrium molecular dynamics simulations are used to examine the friction and wear reduction mechanisms of promising carbon nanoparticle friction modifier additives. Specifically, the friction and wear behaviour of carbon nanodiamonds (CNDs) and carbon nano-onions (CNOs) confined between a-iron slabs is probed at a range of coverages, pressures, and sliding velocities. At high coverage and low pressure, the nanoparticles do not indent into the a-iron slabs during sliding, leading to zero wear and a low friction coefficient. At low coverage and high pressure, the nanoparticles indent into, and plough through the slabs during sliding, leading to atomic-scale wear and a much higher friction coefficient. This contribution to the friction coefficient is well predicted by an expression developed for macroscopic indentation by Bowden and Tabor. Even at the highest pressures and lowest coverages simulated, both nanoparticles were able to maintain separation of the opposing slabs and reduce friction by approximately 75 % compared to when no nanoparticle was present, which agrees well with experimental observations. CNO nanoparticles yielded a lower indentation (wear) depth and lower friction coefficients at equal coverage and pressure with respect to CND, making them more attractive friction modifier additives. Potential changes in behaviour on harder and softer surfaces are also discussed, together with the implications that these results have in terms of the application of the studied nanoparticles as lubricants additives.

show abstract

Section: Effect Of Nanoparticle Coveragesupporting

confidence: 80%

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Polishing of surfaces occurs by the action of NPs by physically removing material, as shown in Fig. 4k, hence reducing surface roughness asperities and COF [71][72][73]. This mechanism has been commonly observed with diamond NPs, likely due to their high hardness, and has shown to improve machining performances [72], such as microdrilling [74].…”

Section: Polishingmentioning

confidence: 91%

“…Diamond NPs dispersed in a PAO6 reduced surface roughness parameters: roughness average (R a ), and room mean square (RMS) of worn surfaces [75]; also, surface characterization by SEM showed less damage and smaller pores with the addition of these NPs. Likewise, Mosleh and Shirvani [73] demonstrated the polishing effect provided by diamond NPs in a 10 W30 motor oil by measuring surface roughness parameters; this reduction in roughness increased film thickness and lowered frictional torque.…”

Section: Polishingmentioning

confidence: 97%

Eco-Friendly Nanoparticle Additives for Lubricants and Their Tribological Characterization

Peña-Parás

Maldonado-Cortés

Taha‐Tijerina

2017

Handbook of Ecomaterials

View full text Add to dashboard Cite

Worldwide manufacturing, as well as the transportation industry, is greatly affected by the rising costs of energy, maintenance, replacement of expensive and crucial components, and environmental legislations. Diverse solutions have been proposed to meet these challenges: more efficient processes that minimize energy consumption, weight reductions, as well as achieving longer maintenance periods and longer replacement times for tooling and components. In order to find a solution for these issues, nanoparticles (NPs) have been used as additives in conventional lubricants decreasing the coefficient of friction (COF)

show abstract

“…The higher increase in the load-carrying capacity with the SiO 2 nanoreinforcements could be attributed to their tribosintering effect onto the worn surface, filling valleys and the shearing of trapped nanoparticles at the interface of contacting surfaces, thus making them smooth and lowering the frictional forces [67][68][69][70]. Similarly, the observed outstanding anti-wear performance can be associated with the hardness of the substrate and the formation of tribo-films as also observed by other authors [67][68][69][70][71][72][73]. Table 3 shows the effect of SiO 2 on COF during tribo-testings according to the ITEePib Polish method for testing lubricants under scuffing conditions [55], compared to bare fluids.…”

Section: Tribological Performancementioning

confidence: 99%

Tribological and Thermal Transport Performance of SiO2-Based Natural Lubricants

2019

View full text Add to dashboard Cite

Fluids and lubricants are critical for the mechanical manufacturing processing of metals, due to a high amount of friction generated, also reflected as heat, could wear and damage tooling and machine components. The proper application of lubricants increases machinery lifetime, decreases long-term costs, and energy and time consumption due to the maintenance or components exchange/repairs. Besides being non-renewable, mineral oils bring consequences to the environment due to their low biodegradability and could affect the user with respiratory and skin diseases. Recently, due to an increase in environmental awareness, the search of biocompatible and efficient lubricants has become a technology goal. The vegetable oil-based lubricants are slowly emerging as ecofriendly and high-performance alternatives to petroleum-based lubricants. This study evaluates soybean, sunflower, corn and paraffinic oils reinforced with SiO2 nanoparticles. The thermal and tribological evaluations were performed varying the temperature and nanofiller concentrations. The thermal conductivity improvements were observed for all nanolubricants as the temperature and filler fraction increased. The highest thermal conductivities were observed at 323 K with 0.25 wt % SiO2. The soybean and corn oils unveiled a maximum enhancement of ~11%. The tribological evaluations showed that SiO2 addition, even in small concentration, resulted into a significant improvement on a load-carrying capacity. For instance, at 0.25 wt % enhancements of 45% and 60% were observed for soybean and sunflower oils, respectively. The coefficient of friction performance also showed enhancements between 10% and 26%.

show abstract

In-situ nanopolishing by nanolubricants for enhanced elastohydrodynamic lubrication

Cited by 25 publications

References 27 publications

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

Nonequilibrium Molecular Dynamics Investigation of the Reduction in Friction and Wear by Carbon Nanoparticles Between Iron Surfaces

Eco-Friendly Nanoparticle Additives for Lubricants and Their Tribological Characterization

Tribological and Thermal Transport Performance of SiO2-Based Natural Lubricants

Contact Info

Product

Resources

About