Decrypting third body flows to solve dry lubrication issue – MoS2 case study under ultrahigh vacuum

Colas, Guillaume; Saulot, Aurélien; Godeau, Claude; Michel, Yann; Berthier, Yves

doi:10.1016/j.wear.2013.06.007

Cited by 46 publications

(84 citation statements)

References 40 publications

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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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Section: Introductionmentioning

confidence: 99%

The Role of Solid Lubricants for Brake Friction Materials

Österle

Дмитриев

2016

Lubricants

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“…In recent years the active compounds of lubricating oil additives include such elements as sulfur [1] and phosphorus [2] which improve antifriction, antiwear and other characteristics. In the case of additives that contain several active compounds, the zinc dialkyldithiophosphate is most widely used [3].…”

Section: Introductionmentioning

confidence: 99%

Stand testing of energy saving motor oil in the internal combustion engine

Ponomarenko¹,

Dudnik

Afanasieva

et al. 2017

MATEC Web Conf.

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Abstract. The problem of increasing the power efficiency of internal combustion engines by the method of its tribochemical treatment was considered. Concentrate additives Komol on the base of molybdenum complexes was developed. This concentrate reduces fuel consumption and increases engine power. In this paper the Subaru EJ-25 engine used in aviation and automotive industry was investigated before and after the tribochemical treatment by the bench tests. It's shown that adding tribochemically active additives into motor oil increases maximal engine power to 10,7% which is 8,7% on comparable engine rotation speeds. The effect was caused by reduced frictional losses as a result of the tribopolymer films formed on friction surfaces.

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“…Here, biocompatibility [12,13] and wear are bound by the tribological circuit [14]. System configuration was decided to set the 1 st body that wears the most in macroscopic moves to avoid excessive wear particle deposit leading to dysfunction ( Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Through the 3 rd body concept, first constraint is to link friction factor evolution to direct observations. Purpose is to understand the life contact with a mechanical approach and being able to attribute accommodation sites and modes [14]. Current 1 st bodies are not see-through.…”

Section: Introductionmentioning

confidence: 99%