Development of nanostructured slide coatings for automotive components

Gebhard, Andreas; Haupert, F.; Schlarb, Alois K.

doi:10.1016/b978-0-444-59455-6.00018-0

Cited by 5 publications

(1 citation statement)

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“…Chemical nanotribology enables the bottom-up synthesis of nanoparticles, which can improve the mechanical performance of polymer and enable the formation of hard coatings via sol-gel processing [6]. Composites exhibiting low friction can also be obtained via this approach [7]. In addition, in the field of tribology, some nanoparticles were reported as oil additives which improve not only the anti-wear ability but also the friction property.…”

Section: Introductionmentioning

confidence: 99%

A Computational Chemistry Approach for Investigation of Low Friction Mechanisms Based on FEP Film with Functionalized SiO<sub>2</sub> Nanoparticles

Morita

Weser

Schottner

2015

AMR

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To improve the fuel efficiency of automobile internal combustion engines, we investigated the fundamental mechanism of friction reduction within engine moving parts. A new coating was designed by introducing SiO2nanoparticles in FEP film. The SiO2nanoparticles were functionalized with hydrophobic fluoroalkyl units on their surface to create additional low friction property. Universal Surface Tester friction measurements revealed a significant reduction of the friction coefficient with increasing number of hydrophobic fluoroalkyl units for SiO2surface functionalization. To clarify the friction reduction mechanisms by the functionalization of SiO2nanoparticles, a quantum chemical calculation was carried out. The result indicates that an attractive force occurs between nanoparticle Si atoms and polymer F atoms, while by adding fluoroalkyl units on the SiO2nanoparticle surface, this force changes to repulsive. By performing a molecular dynamics simulation of a shear model between FEP film and SiO2nanoparticles, we observed a decrease of friction force with increasing fluoroalkyl units which lead smooth rolling motion of nanoparticles, thus confirming the repulsive effect of nanoparticle functionalization. We conclude that fluoroalkyl units on the SiO2surface play an important role in creating a repulsive force between nanoparticle and FEP film which lead to low friction coefficient.

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Section: Introductionmentioning

confidence: 99%