Tribological behavior of nanocomposite coatings based on fullerene-like structures

Alberdi, Alberto; Hatto, Peter; Díaz, Beatriz; Csillag, Stefan

doi:10.1016/j.vacuum.2010.11.019

Cited by 16 publications

(6 citation statements)

References 15 publications

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“…These polyhedral onion-like nanostructures were first discovered by Tenne et al in 1992 [1] and have constantly shown the ability to improve the tribological properties of different systems ever since. Lower friction and wear can be achieved by adding TMDC NPs to oils [2][3][4][5][6][7][8] or by incorporating them in solid matrices [6,[9][10][11][12] and in coatings [13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Testing of WS2 Nanoparticles Functionalized by a Humin-Like Shell as Lubricant Additives

et al. 2018

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Nanoparticles of transition metal dichalcogenides (TMDC) have been known to reduce friction and wear when added to oil-type liquid lubricants. Aggregation limits the ability of the nanoparticles to penetrate into the interface between the two rubbing surfaces-an important factor in friction reduction mechanisms. Doping has been successfully used to reduce agglomeration, but it must be done in the production process of the nanoparticles. The use of surface-functionalized nanoparticles is less common than doping. Nonetheless, it has the potential to reduce agglomeration and thereby improve the reduction of friction and wear. In this study, we present the results of preliminary tribological ball-on-flat tests performed with WS 2 nanoparticles functionalized by a humin-like conformal shell, as additives to polyalphaolefin-4 (PAO-4) oil. We tested WS 2 inorganic nanotubes (INTs) and two grades of inorganic fullerene-like nanoparticles (IFs). The shell/coating was found to improve friction reduction for IFs but not for INTs through better dispersion in the oil. The thicker the coating on the IFs, the less agglomerated they were. Coated industrial-grade IFs were found, by far, to be the best additive for friction reduction. We suggest the combination between reduced agglomeration and poor crystallinity as the reason for this result.

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Section: Introductionmentioning

confidence: 99%

Testing of WS2 Nanoparticles Functionalized by a Humin-Like Shell as Lubricant Additives

et al. 2018

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“…The objective of using oil additives is to keep the ultra-low COF even under mixed lubrication conditions when asperities of the counter-bodies come into direct contact with each other [2]. This usually is achieved by crystallographically aligned solid lubricant films of either graphite [5][6][7] or MoS 2 and WS 2 [8][9][10][11][12], or by amorphous films which can flow in a fluid-like manner [13,14].…”

Section: Introductionmentioning

confidence: 99%

The Role of Solid Lubricants for Brake Friction Materials

Österle

Дмитриев

2016

Lubricants

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This review article comprises of three parts. Firstly, reports of brake manufacturers on the beneficial impact of solid lubricants for pad formulations are surveyed. Secondly, since tribofilms were identified to play a crucial role in friction stabilization and wear reduction, the knowledge about tribofilm structures formed during automotive braking was reviewed comprehensively. Finally, a model for simulating the sliding behavior of tribofilms is suggested and a review on modelling efforts with different model structures related to real tribofilms will be presented. Although the variety of friction composites involved in commercial brake systems is very broad, striking similarities were observed in respect to tribofilm nanostructures. Thus, a generalization of the tribofilm nanostructure is suggested and prerequisites for smooth sliding performance and minimal wear rates have been identified. A minimum of 13 vol % of soft inclusions embedded in an iron oxide based tribofilm is crucial for obtaining the desired properties. As long as the solid lubricants or their reaction products are softer than magnetite, the main constituent of the tribofilm, the model predicts smooth sliding and minimum wear.

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“…Inorganic fullerene-like (IF) nanoparticles continue to garner widespread interest in tribology applications, such as friction modifiers and anti-wear additives in liquid lubricants [1][2][3][4] and as solid lubricants [5][6][7]. Their efficiency for tribological application when they are dispersed in oil is related to their lubrication mechanism which depends on experimental conditions and intrinsic properties of the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%