Shear activation of ZDDP reaction films in the presence and absence of nanodiamonds

Acharya, Biplav; Seed, Caitlin M.; Krim, J.

doi:10.1016/j.apsadv.2022.100214

Cited by 6 publications

(14 citation statements)

References 45 publications

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“…Similarly, ND displayed a synergistic effect when combined with ZDDP. 117 The embedment of ND into the tribofilm resulted in the increased adhesion, thickness, and stiffness of the tribofilm, thereby enhancing the load-bearing capacity of the substrate. The combination of ZDDP with other additives yields a synergistic effect on its antiwear performance, subject to optimal concentration.…”

Section: ■ Influence Of Supplementary Additives On Tribofilm Formatio...mentioning

confidence: 99%

“…An important factor influencing the reduction in friction when using a ZDDP/MoDTC-containing lubricant is the ratio of low-friction MoS 2 with the high-friction species, such as MoO 3 , formed in the contact area. Similarly, ND displayed a synergistic effect when combined with ZDDP . The embedment of ND into the tribofilm resulted in the increased adhesion, thickness, and stiffness of the tribofilm, thereby enhancing the load-bearing capacity of the substrate.…”

Section: Influence Of Supplementary Additives On Tribofilm Formation ...mentioning

confidence: 99%

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Recent Advancements in Understanding of Growth and Properties of Antiwear Tribofilms Derived from Zinc Dialkyl Dithiophosphate Additives under Nanoscale Sliding Contacts

Soni,

Gosvami

2024

Langmuir

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Zinc dialkyl dithiophosphate (ZDDP) is a key antiwear additive in lubricants that forms robust phosphate glass-based tribofilms to mitigate wear on rubbing surfaces. The quest to unravel the enigma of these antiwear film formations on sliding surfaces has persisted as an enduring mystery, despite nearly a century of fervent research. This paper presents a comprehensive review of nanotribological investigations, centering on the tribochemical decomposition of ZDDP antiwear additives. The core of the Review explores investigations conducted through the in situ AFM-based technique, which has been used to unveil the underlying stress-assisted thermal activation (SATA) mechanism behind the formation of antiwear tribofilms on diverse surfaces. A thorough analysis is presented, encompassing governing factors, such as compression, shear, and temperature, that wield influence over the intricate process of tribofilm formation. This is substantiated by a spectrum of structural and chemical characterization-based inferences. Furthermore, atomic-scale computer simulation studies are discussed that provide profound insights into tribochemical reaction mechanisms and elucidate the details of chemical processes at atomic level.

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Section: ■ Influence Of Supplementary Additives On Tribofilm Formatio...mentioning

confidence: 99%

Section: Influence Of Supplementary Additives On Tribofilm Formation ...mentioning

confidence: 99%

Recent Advancements in Understanding of Growth and Properties of Antiwear Tribofilms Derived from Zinc Dialkyl Dithiophosphate Additives under Nanoscale Sliding Contacts

Soni,

Gosvami

2024

Langmuir

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“…In this regard, DFT and MD simulations have been used to explore the tribo-film formation induced by lubricant additives such as ZDDP (Martini and Kim, 2021; Akchurin and Bosman, 2017; Shen et al , 2022; Acharya et al , 2022; Dong et al , 2023) or solid lubricants such as graphene (Berman et al , 2018; Xu et al , 2021), MoS 2 (Yang et al , 2023; Jia et al , 2023) and MXenes (Marquis et al , 2023; Marquis et al , 2022).…”

Section: Characteristics Of Frictionmentioning

confidence: 99%

Insights into modeling approaches for boundary- and mixed-lubricated conditions

Shah,

Gashi,

Mittal

et al. 2024

ILT

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Purpose Tribological research is complex and multidisciplinary, with many parameters to consider. As traditional experimentation is time-consuming and expensive due to the complexity of tribological systems, researchers tend to use quantitative and qualitative analysis to monitor critical parameters and material characterization to explain observed dependencies. In this regard, numerical modeling and simulation offers a cost-effective alternative to physical experimentation but must be validated with limited testing. This paper aims to highlight advances in numerical modeling as they relate to the field of tribology. Design/methodology/approach This study performed an in-depth literature review for the field of modeling and simulation as it relates to tribology. The authors initially looked at the application of foundational studies (e.g. Stribeck) to understand the gaps in the current knowledge set. The authors then evaluated a number of modern developments related to contact mechanics, surface roughness, tribofilm formation and fluid-film layers. In particular, it looked at key fields driving tribology models including nanoparticle research and prosthetics. The study then sought out to understand the future trends in this research field. Findings The field of tribology, numerical modeling has shown to be a powerful tool, which is both time- and cost-effective when compared to standard bench testing. The characterization of tribological systems of interest fundamentally stems from the lubrication regimes designated in the Stribeck curve. The prediction of tribofilm formation, film thickness variation, fluid properties, asperity contact and surface deformation as well as the continuously changing interactions between such parameters is an essential challenge for proper modeling. Originality/value This paper highlights the major numerical modeling achievements in various disciplines and discusses their efficacy, assumptions and limitations in tribology research. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-03-2023-0076/

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“…The accumulation of tribofilm F inside the engine [V M • d MF /dt] is counted as the rate of tribofilm formation [σκ A MA ] minus the rate of tribofilm removal ςR F (3). It should be noted that κ A and R F are experimental parameters that depend on temperature, catalytic effect, engine speed, and other mechanical variables [14] and that must be determined experimentally [23][24][25][26][27][28][29][30]. For this work, the operation of the engine was considered in steady state, therefore these two parameters are assumed to be constant.…”

Section: Mathematical Model For the Lubricating Systemmentioning

confidence: 99%

“…Combining Equations ( 21) and (22) with Equations ( 1) and ( 2), it is possible to obtain Equations ( 23) and (24).…”

Section: Lubrication System Model Without Regulatormentioning

confidence: 99%

Maximizing Lubricant Life for Internal Combustion Engines

Domínguez-García

Béjar²,

López-Velázquez³

et al. 2022

Processes

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Although the lubrication systems for internal combustion engines have been designed to prevent engine wear and friction, their configuration does not contemplate the maximum use of each load of lubricant; because of this limitation, lubricant consumption is currently an environmental and economic problem. In this work, the performance of lubrication systems to form the tribological film that prevents wear is simulated and optimized, through the mass balance of the lubricant precursors contained in the oil and the implementation of optimal control techniques. Optimization results indicate that regulating the flow of lubricant passing through the engine prevents excessive degradation of lubricant precursors, maximizing the life of each lube oil charge, giving the possibility to increase the sustainability of internal combustion engines.

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Shear activation of ZDDP reaction films in the presence and absence of nanodiamonds

Cited by 6 publications

References 45 publications

Recent Advancements in Understanding of Growth and Properties of Antiwear Tribofilms Derived from Zinc Dialkyl Dithiophosphate Additives under Nanoscale Sliding Contacts

Recent Advancements in Understanding of Growth and Properties of Antiwear Tribofilms Derived from Zinc Dialkyl Dithiophosphate Additives under Nanoscale Sliding Contacts

Insights into modeling approaches for boundary- and mixed-lubricated conditions

Maximizing Lubricant Life for Internal Combustion Engines

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