Surface texturing by pulsed Nd:YAG laser

Vilhena, Luís; Sedlaček, Marko; Podgornik, Bojan; Vižintin, J.; Babnik, Aleš; Možina, Janez

doi:10.1016/j.triboint.2009.06.003

Cited by 222 publications

(90 citation statements)

References 8 publications

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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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Section: Introductionmentioning

confidence: 99%

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

2017

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“…It discusses about lasers with a pulse duration working on nanoseconds (10 −9 s) [21], picoseconds (10 −12 s) [22] or femtoseconds (10 −15 s) [23]. Due to the very short pulses it is possible to obtain an extremely high peak power and high energy delivered during a single pulse.…”

Section: Introductionmentioning

confidence: 99%

Laser surface texturing of tool steel: textured surfaces quality evaluation

2016

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Abstract:In this experimental investigation the laser surface texturing of tool steel of type 90MnCrV8 has been conducted. The 5-axis highly dynamic laser precision machining centre Lasertec 80 Shape equipped with the nano-second pulsed ytterbium fibre laser and CNC system Siemens 840 D was used. The planar and spherical surfaces first prepared by turning have been textured. The regular array of spherical and ellipsoidal dimples with a different dimensions and different surface density has been created. Laser surface texturing has been realized under different combinations of process parameters: pulse frequency, pulse energy and laser beam scanning speed. The morphological characterization of ablated surfaces has been performed using scanning electron microscopy (SEM) technique. The results show limited possibility of ns pulse fibre laser application to generate different surface structures for tribological modification of metallic materials. These structures were obtained by varying the processing conditions between surface ablation, to surface remelting. In all cases the areas of molten material and re-cast layers were observed on the bottom and walls of the dimples. Beside the influence of laser beam parameters on the machined surface quality during laser machining of regular hemispherical and elipsoidal dimple texture on parabolic and hemispherical surfaces has been studied.

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“…A good solution to this criterion is a laser, which has been commonly used for surface texturing of steel [15,16]. It was found that this method of surface treatment allowed the generation of micropores with different characteristics.…”

Section: Laser Processingmentioning

confidence: 99%

Laser Processing of Silicon for Synthesis of Better Biomaterials

Colpitts¹,

Kiani²

2018

Biomaterials in Regenerative Medicine

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The increasing demand for new biomaterials and fabrication methods provides an opportunity for silicon to solve current challenges in the field. Laser processing is becoming more common as the public begins to understand its simplicity and value. When an abundant material is paired with a reliable and economic fabrication method, biomedical devices can be created and improved. In this chapter, different laser parameters of the Nd:YAG laser are investigated and the topographic and physical trends are analyzed. The biocompatibility is assessed for scanning speed, line spacing, overlap number, pulse frequency, and laser power with the use of simulated body fluid (SBF) and fibroblast culturing (NIH 3T3). Not only can nanosecond pulses increase the biocompatibility of silicon by generating silicon oxide nanofibers, but the substrate becomes bioactive with the manipulation of cell interactions.

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Surface texturing by pulsed Nd:YAG laser

Cited by 222 publications

References 8 publications

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

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

Laser surface texturing of tool steel: textured surfaces quality evaluation

Laser Processing of Silicon for Synthesis of Better Biomaterials

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