Coating‐lubricant combination for improving tribo‐system performance

Minami, Ichiro; He, Xin; Prakash, Braham

doi:10.1002/ls.1269

Cited by 6 publications

(12 citation statements)

References 30 publications

(54 reference statements)

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“…Conventional tribofilm and hard coating on steel surfaces, respectively, have both advantages and drawbacks as shown in Figure 2 [19]. To overcome the disadvantages and to achieve low friction and low wear simultaneously, forming simplified tribofilm on the hard coating would be desirable.…”

Section: Hybrid Lubrication Conceptmentioning

confidence: 99%

Reducing Friction and Wear of Tribological Systems through Hybrid Tribofilm Consisting of Coating and Lubricants

2014

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Abstract:The role of surface protective additives becomes vital when operating conditions become severe and moving components operate in a boundary lubrication regime. After protecting film is slowly removed by rubbing, it can regenerate through the tribochemical reaction of the additives at the contact. However, there are limitations about the regeneration of the protecting film when additives are totally consumed. On the other hand, there are a lot of hard coatings to protect the steel surface from wear. These can enable the functioning of tribological systems, even in adverse lubrication conditions. However, hard coatings usually make the friction coefficient higher, because of their high interfacial shear strength. Amongst hard coatings, diamond-like carbon (DLC) is widely used, because of its relatively low friction and superior wear resistance. In practice, conventional lubricants that are essentially formulated for a steel/steel surface are still used for lubricating machine component surfaces provided with protective coatings, such as DLCs, despite the fact that the surface properties of coatings are quite different from those of steel. It is therefore important that the design of additive molecules and their interaction with coatings should be re-considered. The main aim of this paper is to discuss the DLC and the additive combination that enable tribofilm formation and effective lubrication of tribological systems.

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Section: Hybrid Lubrication Conceptmentioning

confidence: 99%

Reducing Friction and Wear of Tribological Systems through Hybrid Tribofilm Consisting of Coating and Lubricants

2014

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“…In addition to the actions on the lubricant, many studies have been recently conducted on the improvement of friction through the surface geometry of the bodies in contact, which includes the surface finish, the coatings and the surface texturing . The present paper studies different types of textures to find out which ones decrease the friction coefficient the most.…”

Section: Introductionmentioning

confidence: 99%

Optimising the design of textured surfaces for reducing lubricated friction coefficient

Otero

Ochoa

Vallinot

et al. 2016

Lubrication Science

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Under operating conditions which are unfavourable for lubrication, such as high load and low velocity, the use of textured surfaces significantly promotes the formation of a thick lubricant film and an improvement of the friction coefficient. This paper relates to the manufacture of textures using a photolithography and chemical etching process. Different surface geometries, texturing densities and depths were designed to analyse the influence of these parameters. The friction coefficient was measured in a ball-on-disc tribometer under different lubrication regimes, and the results have been used to develop an artificial neural network with texturing optimisation potential.

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“…Similarly to surface-active (polar) friction additives, the 1,3-diketone can react with the surface and form a tribo film on a metal surface, which improves the tribological behavior. , This interaction improves the tribological performance, especially in the boundary lubrication regime . The tribological performance of metal tribosystems can be improved by using additives with more polar groups .…”

Section: Resultsmentioning

confidence: 99%

“…The tribological performance of metal tribosystems can be improved by using additives with more polar groups . The high hardness of DLC coatings enables low wear but results in higher friction . To analyze surface-near chemical interactions and the distribution of elements within the tribologically influenced boundary layer XPS measurements of the plates were carried out.…”

Section: Resultsmentioning

confidence: 99%

Macroscopic Superlow Friction of Steel and Diamond-Like Carbon Lubricated with a Formanisotropic 1,3-Diketone

et al. 2017

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Energy dissipation due to friction and wear is reducing the energy efficiency and reliability of mechanical systems. Thus, great efforts are being made to minimize friction for technical applications. In our present work, we investigate the tribological behavior of stainless steel 100Cr6 with a-C:H and a-C:H:Si coating lubricated with a surface-active formanisotropic 1,3-diketone. The results show that superlow friction can be achieved on the macroscale using a steel 100Cr6 self pairing (COF ∼ 0.005) and with 100Cr6 in combination with a-C:H coating (COF ∼ 0.008). Furthermore, the replacement of steel with a-C:H coating leads to a considerable decrease of wear. The reduced COF arises from the chemical interaction of the lubricant with the surface and nascent iron ions. It was found that interfacial parameters correlate with tribological results. In addition, the alignment of the formanisotropic molecules in the tribological contact at thin-film lubrication leads to an anisotropic viscosity with a minimum shear resistance in sliding direction. Atomistic simulation of tribochemical interactions was conducted to derive a friction model based on the thin-film lubrication theory. This investigation indicates the potential to substantially reduce friction and wear using this fluid in real technical applications.

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Coating‐lubricant combination for improving tribo‐system performance

Cited by 6 publications

References 30 publications

Reducing Friction and Wear of Tribological Systems through Hybrid Tribofilm Consisting of Coating and Lubricants

Reducing Friction and Wear of Tribological Systems through Hybrid Tribofilm Consisting of Coating and Lubricants

Optimising the design of textured surfaces for reducing lubricated friction coefficient

Macroscopic Superlow Friction of Steel and Diamond-Like Carbon Lubricated with a Formanisotropic 1,3-Diketone

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