Tribological texturing of steel surfaces with a novel diamond embossing tool technique

Pettersson, Ulrika; Jacobson, Staffan

doi:10.1016/j.triboint.2005.06.004

Cited by 79 publications

(32 citation statements)

References 17 publications

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“…470-517, ISBN: 978-1-84569-993-2 Embossing offers the possibility to transfer a textured pattern onto all plastically deformable materials including steel (Pettersson, 2005 andPettersson andJacobson, 2006).…”

Section: Surface Texturing Methodsmentioning

confidence: 99%

Optimised textured surfaces with application in piston ring/cylinder liner contact

Rahmani

Shirvani

2010

Tribology and Dynamics of Engine and Powertrain

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This item was submitted to Loughborough's Institutional Repository (https://dspace.lboro.ac.uk/) by the author and is made available under the following Creative Commons Licence conditions.For the full text of this licence, please go to: http://creativecommons.org/licenses/by-nc-nd/2.5/ In: Tribology and Dynamics of Engine and Powertrain: Fundamentals, Applications and Future Trends, Edited by H. Rahnejat, Woodhead Publishing, 2010, pp. 470-517, ISBN: 978-1-84569-993-2 Chapter 14 Optimised Textured Surfaces with Application in Piston-Ring/Cylinder Liner Contact R. RAHMANI, Loughborough University, UK A. SHIRVANI and H. SHIRVANI, Anglia Ruskin University, UK Abstract: The application of textured surfaces in tribology has recently gained a huge momentum. In this chapter, a systematic approach to investigate the maximum outcomes from employing such surfaces is introduced with an insight into their application in internal combustion engines. A combination of various affecting parameters on the tribological performance of such surfaces is studied and the optimum results were introduced. The effect of employing such optimised textures in enhancing the lubrication condition in piston ring/cylinder liner contact is also studied.Key words: surface texturing, piston ring/cylinder liner contact, optimisation, slider bearings IntroductionIn general, friction is inherent to and is produced between bodies in contact with relative motion. Friction tends to oppose this relative motion between the bodies through loss of energy mostly in the form of heat, mechanical vibration and noise. Therefore, in most cases, friction is an unfavourable phenomenon. In some cases introduction of friction is desired, for example in order to slow down a moving car, the brakes are used to reduce the existing kinetic energy in the wheels by means of producing frictional losses. However, in most of the cases, facilitating this relative motion between bodies is of concern and as a result, one needs to overcome friction so that the relative motion pursues with a minimal loss of energy.Excessive friction can cause damage to the surfaces in contact in several ways and as a result make them wear. Since the surfaces are damaged due to wear, the rate of energy dissipation due to friction increases and consequently amplifies the rate of wear itself (see Chapter 2).The reason for the existence of friction is mainly that in reality, there is no perfect smooth surface. In fact, surfaces have a degree of roughness in the form of small 'hills' and 'valleys' no matter how well they are prepared. When two surfaces, which are in contact with each other, are put into relative motion, the asperities on the In: Tribology and Dynamics of Engine and Powertrain: Fundamentals, Applications and Future Trends, Edited by H. Rahnejat, Woodhead Publishing, 2010, pp. 470-517, ISBN: 978-1-84569-993-2 opposing surfaces become locked hence inducing friction as initially proposed by Amontons for onset of motion and later under kinetic conditions by Coulomb (see Chapter 2). W...

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Section: Surface Texturing Methodsmentioning

confidence: 99%

Optimised textured surfaces with application in piston ring/cylinder liner contact

Rahmani

Shirvani

2010

Tribology and Dynamics of Engine and Powertrain

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“…One of these technologies is texturing the surface with micro dimples [4][5][6]. Such a surface texturing can be performed by indentation [7], chemical etching [8] or laser ablation [9]. Out of these techniques, laser surface texturing (LST) has prevailed as the most successful one due to its flexibility and ecological as well as economical superiority.…”

Section: Introductionmentioning

confidence: 99%

Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

2017

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Abstract:Unidirectional sliding experiments with polished and laser textured steel surfaces were carried out to investigate the effects of different textured area densities, aspect ratios and dimple arrangements. The system was lubricated with Polyalphaolefin (PAO) at 100 °C and the contact pressure was 3 MPa. For measuring Stribeck curves, the sliding speed was controlled between 40 and 2000 mm/s. The textured area density was varied between 5% and 30%, with the lowest friction values found for 10%. Aspect ratios ranging from 0.02 to 0.2 were investigated and for 0.1 the lowest friction values were measured. The dimple arrangements tested were cubic, hexagonal and a random distribution for a textured area density of 10% and an aspect ratio of 0.1. Our results demonstrate that the dimple arrangement does affect friction values, hinting to the fact that individual texture elements do influence each other. The optimum dimple arrangement was found in a hexagonal packing. This systematic variation of these three key texturing parameters for the morphological texturing of a tribological surface with dimples will allow a strategic choice of texturing parameters. This makes the most of the tremendous potential that laser surface texturing has for reducing friction forces and thereby CO2 emissions.

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“…We have already checked alternative fabrication methods for pattern master using photo-lithography and dielectric etch mask (SiO 2 , SiN x ) to form highly ordered lattice-like patterns with uniform size [1,2,15]. When we compare the uniformity and brightness of films between randomlypositioned and periodic-positioned patterns, data showed no considerable differences in brightness enhancement.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore optical films are generally employed when LED lighting devices are assembled and packaged. Their role is to redistribute the light rays coming out from the point LED sources and uniformly radiate onto the forward direction without sacrificing illuminance [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Viewing Angle Direction Brightness-Enhancement Optical Films using Surface Textured Silicon Wafers

Jang

Shim

Lee

et al. 2014

Journal of the Optical Society of Korea

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We demonstrate a low-cost, superbly efficient way of etching for the nano-, and micro-sized pyramid patterns on (100)-oriented Si wafer surfaces for use as a patterned master. We show a way of producing functional optical films for the viewing angle direction brightness-enhancement of Lambertian LED (light emitting diode)/OLED (organic light emitting diode) planar lighting applications. An optimally formulated KOH (Potassium hydroxide) wet etching process enabled random-positioned, and random size-distributed (within a certain size range) pyramid patterns to be developed over the entire (100) silicon wafer substrates up to 8" and a simple replication process of master patterns onto the PC (poly-carbonate) and PMMA (polymethyl methacrylate) films were performed. Haze ratio values were measured for several film samples exhibiting excellent values over 90% suitable for LED/OLED lighting purposes. Brightness was also improved by 13~14% toward the viewing angle direction. Computational simulations using LightTools™ were also carried out and turned out to be in strong agreement with experimental data. Finally, we could check the feasibility of fabricating low-cost, large area, high performance optical films for commercialization.

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Tribological texturing of steel surfaces with a novel diamond embossing tool technique

Cited by 79 publications

References 17 publications

Optimised textured surfaces with application in piston ring/cylinder liner contact

Optimised textured surfaces with application in piston ring/cylinder liner contact

Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

Fabrication of Viewing Angle Direction Brightness-Enhancement Optical Films using Surface Textured Silicon Wafers

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