Individual and combined effects of introducing DLC coating and textured surfaces in lubricated contacts

Vallinot, Irene Bellón; Ochoa, Eduardo de la Guerra; Otero, Javier Echávarri; Tanarro, Enrique Chacón; Martínez, Iván Fernández; Varela, José Antonio Santiago

doi:10.1016/j.triboint.2020.106440

Cited by 11 publications

(7 citation statements)

References 33 publications

(56 reference statements)

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“…One such effective way is to incorporate textures and slip/anti-wetting coatings on the bearing surface. Recently, researchers have been continuously attracted towards the combination of slip-textured surfaces, which has been proven quite effective in increasing the hydrodynamic performance of the sliding contacts [5][6][7][8][9]. Vallinot et al [5] studied the frictional characteristics of slip coated (DLC (diamond-like carbon)) textured circular discs under boundary and full film lubrication on ball-on disc tribometer.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, researchers have been continuously attracted towards the combination of slip-textured surfaces, which has been proven quite effective in increasing the hydrodynamic performance of the sliding contacts [5][6][7][8][9]. Vallinot et al [5] studied the frictional characteristics of slip coated (DLC (diamond-like carbon)) textured circular discs under boundary and full film lubrication on ball-on disc tribometer. Their results exhibited a significant reduction in the coefficient of friction (COF) of DLC surface.…”

Section: Introductionmentioning

confidence: 99%

“…They showed that the presence of slip boundary and textures reduces frictional force and thus contributes better lubricant intake to the bearing. Based on the reference studies [5][6][7][8][9], it is clear that researchers have been continuously using the concept of textures and slip boundary/non-wettable coatings on different bearing applications to increase bearing performance and thus holds important outcomes towards the use of slip-textured surfaces on the inclined slider bearings. In inclined slider bearings, hydrodynamic pressure is generated through the wedging phenomenon of the lubricating film caused by tilting the bearing pad to some inclination/convergence.…”

Section: Introductionmentioning

confidence: 99%

“…On comparing the results with the theoretical analysis, similar observations were reported. Vallinot et al [5] studied the combined effect of texturing and diamond-like carbon (DLC) coatings on the lubrication performance of sliding contacts. Photolithography and chemical etching were used to texture the surface, whereas, magnetron sputtering is used to deposit DLC coatings.…”

Section: Introductionmentioning

confidence: 99%

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Thermohydrodynamic performance of convergent slider bearings using different placement of square micro-textures and slip boundary

Singh,

Kango

2024

Phys. Scr.

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The present numerical study investigates the thermohydrodynamic performance of inclined/convergent slider bearings using different placing of textures and slip region. Mass-conserving Elrod cavitation model with slip boundary is used to analyze the static performance variables. Due to better fluid retain-ability, Square-shaped micro-textures have been used. The slip coefficient for the slip boundary on the bearing surface is taken as 9 μm. As reported previously for convergent bearings, the optimal convergence ratio (K) value for maximum bearing performance lies between 1 and 1.4. Therefore, in the present paper, the value of K is taken as 1.2. It was observed that the location of micro-textures and slip boundary greatly influence the bearing performance. When textures and slip regions are placed near the inlet region of the bearing, with a reduction in shear stress and the availability of the lubricant near the inlet, the resistance to the lubricant flow reduces, increasing lubricant intake. Further, for partial slip bearing, an abrupt obstruction to the lubricant flow occurs at the location of the slip/no-slip interface, which increases the hydrodynamic pressure and improves the load bearing capacity of the bearing. Moreover, due to less friction observed, various slip-textured bearings showed a reduction in the average lubricant temperature compared to conventional bearing. In the end, an updated combined slip-textured bearing surface is presented for maximum bearing performance in terms of different performance variables. The findings of the current work would be helpful for researchers in selecting the optimum slip-textured surface for inclined slider bearings under the current operating conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermohydrodynamic performance of convergent slider bearings using different placement of square micro-textures and slip boundary

Singh,

Kango

2024

Phys. Scr.

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“…They found that textured coating surface possesses advantages of both texture and coating, that is, good frictional behavior and anti-wear performance [26]. Furthermore, the coating helped to stabilize texture's anti-friction effect [27], and the texture enabled stronger adhesion force between coating and substrate [28].…”

Section: Introductionmentioning

confidence: 99%

Effects of Micro Dimple’s Topography Parameters on Wear Resistance of Laser Textured AlCrN Coating Under Starved Lubrication Condition

Yang¹,

Fu²,

Fu³

et al. 2021

Surf. Topogr.: Metrol. Prop.

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Due to good impact wear performance and abrasion resistance, AlCrN coating has been widely used on stamping die. But because the tribological property of the surface is poor, in practical application, coating often wears or spalls. To furtherly enhance the coating's wear resistance, coating combined with laser surface textures was applied. In this study, micro dimples with different depths and diameters were fabricated on different samples and their depth-to-diameter ratios also varied. Reciprocating pin-on-disk tests under starved lubrication conditions were performed to compare samples' wear resistance. The wear morphology was observed under confocal microscopy and scanning electron microscope (SEM) with energy dispersive spectroscopy (EDS) to investigate the influence mechanism of topography parameters on wear resistance. The results showed that optimal topography parameters could be found to achieve the best wear resistance. When the depth-todiameter ratio was small, serious adhesive wear occurred due to insufficient ability of storing wear debris; when the ratio was large, the surface suffered severe adhesion wear due to poor lubrication condition. In addition, for micro dimples with small depth-to-diameter ratio, the coating on the dimple wall could cracked because of horizontal friction force. Furthermore, for dimple with large diameter, the dimple edge could interlock with the upper sample edge, causing serious wear. The contribution provided reference for the topography parameters selection of textured coating under starved lubrication conditions.

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Patterns-Based Coating of Piston Skirt for Added Benefits during Hydrodynamic Lubrication in Internal Combustion Engines

Ali

Liwicki

Almqvist

et al. 2022

Int.J Automot. Technol.

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Individual and combined effects of introducing DLC coating and textured surfaces in lubricated contacts

Cited by 11 publications

References 33 publications

Thermohydrodynamic performance of convergent slider bearings using different placement of square micro-textures and slip boundary

Thermohydrodynamic performance of convergent slider bearings using different placement of square micro-textures and slip boundary

Effects of Micro Dimple’s Topography Parameters on Wear Resistance of Laser Textured AlCrN Coating Under Starved Lubrication Condition

Patterns-Based Coating of Piston Skirt for Added Benefits during Hydrodynamic Lubrication in Internal Combustion Engines

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