Interaction Between Selected MoS2 Nanoparticles and ZDDP Tribofilms

Tomala, A.; Vengudusamy, Balasubramaniam; Ripoll, Manel Rodríguez; Suarez, Aldara Naveira; Remškar, Maja; Rosentsveig, Rita

doi:10.1007/s11249-015-0552-z

Cited by 55 publications

(35 citation statements)

References 19 publications

(45 reference statements)

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“…In traditional metallic friction pairs, the protective tribofilm formed by deposited nanoparticles is the essential tribological mechanism for most of the existing nano-additives (such as Ag, Cu, MoS 2 , WS 2 and ZrO 2 ) [20,21,22,23,24,25,26,27,28]. However, for a-C surfaces that have low adhesiveness and high hardness, the lubrication of nanoparticles may rely on other mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Improved Tribological Performance of Amorphous Carbon (a-C) Coating by ZrO2 Nanoparticles

et al. 2016

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Nanomaterials, such as Graphene, h-BN nanoparticles and MoS2 nanotubes, have shown their ability in improving the tribological performance of amorphous carbon (a-C) coatings. In the current study, the effectiveness of ZrO2 nanoparticles (ZrO2-NPs) in lubricating the self-mated nonhydrogenated a-C contacts was investigated in boundary lubrication regime. The results showed that 13% less friction and 50% less wear compared to the base oil were achieved by employing ZrO2-NPs in the base oil in self-mated a-C contacts. Via analyzing the ZrO2-NPs and the worn a-C surface after tests, it was found that the improved lubrication by ZrO2-NPs was based on “polishing effects”, which is a new phenomenon observed between a-C and nanoparticles. Under the “polishing effect”, micro-plateaus with extremely smooth surface and uniform height were produced on the analyzed a-C surface. The resulting topography of the a-C coating is suitable for ZrO2-NPs to act as nano-bearings between rubbing surfaces. Especially, the ZrO2-NPs exhibited excellent mechanical and chemical stability, even under the severe service condition, suggesting that the combination of nonhydrogenated a-C coating with ZrO2-NPs is an effective, long lasting and environment-friendly lubrication solution.

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Section: Introductionmentioning

confidence: 99%

Improved Tribological Performance of Amorphous Carbon (a-C) Coating by ZrO2 Nanoparticles

et al. 2016

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“…During this phenomenon, NPs deposit on the worn surface by limiting abrasion [45]. Moreover, the addition of high thermal conductivity nanoadditives, such as nanocarbons [46], can determine an increased thermal conductivity [20][21][22][23][24][25][26]47], which facilitates heat dissipation and reduces cracks' occurrence.…”

Section: Mending/repairing Effectmentioning

confidence: 99%

“…In summary, this review, after introducing the four main lubrication mechanisms of nanoparticles, such as tribofilm formation due to tribochemical reaction [25,26], ball bearing [27,28], mending and the polishing effect [29,30], focuses considerable attention on the adoption of rGO/GO in the field of tribology and includes a critical review dedicated to the optimization of nanoparticles, as well as to nanoadditives' functionalization to give a stable and homogenous suspension. An overview of this study is presented in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

rGO/GO Nanosheets in Tribology: From the State of the Art to the Future Prospective

et al. 2020

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In the last few decades, in the lubricant industry, the request for new performing additives has been becoming imperative. In this scenario, control at the nanoscale can be the key factor for the improvement of more efficient nanolubricants. Herein, after a discussion about the nanoparticles’ four main lubrication mechanisms, considerable attention is devoted to the usage of reduced graphene oxide/graphene oxide (rGO/GO) nanosheets in tribology. Moreover, graphene surface functionalization is reviewed, also including unexplored results in the field of lubrication. As far as the literature is concerned, it can be postulated that rGO/GO nanosheets can reduce wear and friction. Wear reduction is obtained by deposition and film formation, while friction reduction is related more to the shear and lamination of the sheets on the contacting surfaces. Nevertheless, the two phenomena are interrelated and work in sync. In this context, it is of high importance to form a homogenous suspension for a continuous nanosheet supply after deposition and shearing. The focus of this review was placed on the main issues still to be overcome, e.g., the literature results in rationalization; dispersion stability enhancement; and finding the optimum concentration in the delicate balance of different components. Possible solutions for their efficient overcoming are eventually reported.

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“…The reason is that whereas TMD nanoparticles have superb friction reduction properties, they cannot fulfil all roles required for a lubricant additive, such as corrosion or sludge control. Previous work has revealed the synergy between TMD nanoparticles and ZDDP tribofilms [19][20][21]. The reason for this synergy is the exfoliation of TMD nanoparticles on top of well-formed ZDDP tribofilms.…”

Section: Introductionmentioning

confidence: 99%

Performance of nanolubricants containing MoS2 nanotubes during form tapping of zinc-coated automotive components

Ripoll

Tomala

Totolin

et al. 2019

Journal of Manufacturing Processes

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The paper presents the first use of nanolubricants containing MoS 2 nanotubes for form tapping of zinc-coated steel. MoS 2 nanotubes are known for their superb low frictional, anti-wear and extreme pressure properties and have shown a promising performance as nanolubricant additive in many machining and forming applications. However their interfacial interaction with zinc-coated components commonly used in automotive applications and their synergisms and antagonisms with currently used additives in forming oils are two crucial aspects that have not been addressed so far. The assessment of these synergies is of uttermost importance for developing future nanofluid minimum quantity lubrication formulations, since despite their extraordinary performance, MoS 2 nanotubes are not able to fulfil all the roles expected from a forming oil. To this end, this paper aims to investigate the performance of MoS 2-based nanolubricants in combination with representative forming oil additives. The threads are perform using a form tapping unit with customized data acquisition on zinc-coated steel, as a representative part in automotive applications. The performance of the nanolubricants is thoroughly investigated using advanced analytic methods with the aim of revealing the underlying interface interaction mechanisms for the observed torque behaviour and resulting thread morphology and sub-surface hardness. The results show that MoS 2 nanotubes are able to interact and form a tribofilm in Zn coated surfaces that leads to a superb friction performance. In combination with oil additives, MoS 2 based nanolubricants have a particularly positive synergy with extreme pressure additives in terms of friction reduction, sub-surface hardening and thread morphology. On contrary, the lowest synergy is achieved in the presence of dispersants, leading to higher torques during form tapping and higher sub-surface hardness in the formed threads.

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Interaction Between Selected MoS2 Nanoparticles and ZDDP Tribofilms

Cited by 55 publications

References 19 publications

Improved Tribological Performance of Amorphous Carbon (a-C) Coating by ZrO2 Nanoparticles

Improved Tribological Performance of Amorphous Carbon (a-C) Coating by ZrO2 Nanoparticles

rGO/GO Nanosheets in Tribology: From the State of the Art to the Future Prospective

Performance of nanolubricants containing MoS2 nanotubes during form tapping of zinc-coated automotive components

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