Fast Uniform Micro Structuring of DLC Surfaces Using Multiple Ultrashort Laser Spots through Spatial Beam Shaping

Saint-Pierre, D.; Granier, Julien; Egaud, Gregory; Baubeau, Emmanuel; Mauclair, Cyril

doi:10.1016/j.phpro.2016.08.124

Cited by 5 publications

(4 citation statements)

References 17 publications

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“…Such surface morphology, once capped with a low surface energy coating, might also exhibit oleophobic characteristics [28]; experiments on coating preparation and oleophobicity test are currently underway. It is also worth noting that upscaling such ultrafast LASS to an even larger surface, in the order of cm 2 towards m 2 , is fairly straightforward nowadays, as it is based on standard ultrafast laser beam shaping, scanning, and processing tools [3].…”

Section: Resultsmentioning

confidence: 99%

“…In the vast majority of laser additive manufacturing (LAM) processes, high power, continuous, or long-pulsed lasers are commonly used as high-efficiency thermal sources to heat up metallic powders/bulk, and cause melting/cohesion. Ultrafast laser pulses, due to their low onset of thermal effect, on the one hand, are extensively used in the high-precision substractive processing sector, such as surface structuring [2,3], bulk inscription [4,5], and thin-film scribing [6]; however, on the other hand, they find themselves available for a fairly limited amount of applications in LAM. The few existing applications include ultrafast laser additive manufacturing/surface structuring for high melting temperature metals [7,8], laser-induced forward transfer (LIFT) for stacking up miniature building blocks together toward high precision, µm-scale additive processes [9,10], and improving surface finishing of metal parts produced by conventional LAM [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Additive and Substractive Surface Structuring by Femtosecond Laser Induced Material Ejection and Redistribution

et al. 2018

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A novel additive surface structuring process is devised, which involves localized, intense femtosecond laser irradiation. The irradiation induces a phase explosion of the material being irradiated, and a subsequent ejection of the ablative species that are used as additive building blocks. The ejected species are deposited and accumulated in the vicinity of the ablation site. This redistribution of the material can be repeated and controlled by raster scanning and multiple pulse irradiation. The deposition and accumulation cause the formation of µm-scale three-dimensional structures that surpass the initial surface level. The above-mentioned ablation, deposition, and accumulation all together constitute the proposed additive surface structuring process. In addition, the geometry of the three-dimensional structures can be further modified, if desirable, by a subsequent substractive ablation process. Microstructural analysis reveals a quasi-seamless conjugation between the surface where the structures grow and the structures additively grown by this method, and hence indicates the mechanic robustness of these structures. As a proof of concept, a sub-mm sized re-entrant structure and pillars are fabricated on aluminum substrate by this method. Single units as well as arrayed structures with arbitrary pattern lattice geometry are easily implemented in this additive surface structuring scheme. Engineered surface with desired functionalities can be realized by using this means, i.e., a surface with arrayed pillars being rendered with superhydrophobicity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Additive and Substractive Surface Structuring by Femtosecond Laser Induced Material Ejection and Redistribution

et al. 2018

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“…In general, the cost is compatible to that of tool machining and surface larger than 250 cm 2 can be textured per minute. [10] Figure 1 depicts the polymer behavior in the mold cavity during the filling phase. Texture impregnation, when the polymer flow passes above, it largely depends on the rheological nature of the polymer and its transition temperature.…”

Section: Introductionmentioning

confidence: 99%

Injection of a microtextured polymer part surface: Influence of experimental parameters on the replication rate

Brulez

Boschard

Larochette

et al. 2020

Polymer Engineering & Sci

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Injection manufacturing makes it possible to functionalize the surfaces of microtextured plastic parts without resorting to expensive post‐treatments. An instrumented mold was developed and microtextures were etched in the cavity with a femtosecond laser. A setting methodology only following in situ parameters, especially cavity pressurizing velocity was used to complete process control. The quality of the replication was quantified by the ratio, R, of microtexture part height replication over etched texture depth in the cavity. Different setting parameters such as injection velocity, Vf, mold temperature, TMo, and holding pressure, PHMax, were investigated on two different injection molding machine. A statistical analysis enabled a validation of the protocol while showing that the influence of the injection molding machine is nonsignificant. Furthermore, injection velocity appeared as a key parameter, it acts at the same time on the thermal aspect of the flow front, frozen‐layer fraction creation, but more importantly on the polymer's viscosity. An injection velocity threshold where above, mold temperature and holding pressure become secondary for better quality replication. This allowed as well to establish an empiric expression which makes it possible to calculate a pattern quality replication ratio, R, according to different parameters (Vf, TMo, PHMax).

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“…The increasing availability of advanced fiber and DPSS lasers with characteristic pulse lengths ranging from ns to fs provides a unique frame in which the development of laser generated micro/nano-structures has been made possible for very diverse kinds of materials and applications [1][2][3]. Surface functionalization with different technical purposes has been thoroughly described [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Modification of Ti6Al4V surface properties by combined DLW-DLIP hierarchical micro-nano structuring

Ocaña

Huerta-Murillo

Lasagni

et al. 2020

Advanced Optical Technologies

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AbstractThe use of pulsed laser irradiation techniques has proven to be a clearly effective procedure for the achievement of surface properties modification via micro-/nano-structuration, different conceptual approaches having been the subject of research and extensively reported in the literature. Completing the broad spectrum of applications developed mostly involving the generation of structured surfaces (particularly of metallic materials) with specific contact, friction and wear functionalities, the application of laser sources to the surface structuration of metal surfaces for the modification of their wetability and corrosion resistance properties is considered. The particular problems found for the generation of the appropriate surface microstructure able to replicate the hydrophobic behaviour of some live structures present in nature, their long term stability and their amenability to macroscopic scale are discussed along with innovative methods to generate the required hierarchical micro-/nano-structures by a combination of the DLW and DLIP techniques.

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Fast Uniform Micro Structuring of DLC Surfaces Using Multiple Ultrashort Laser Spots through Spatial Beam Shaping

Cited by 5 publications

References 17 publications

Additive and Substractive Surface Structuring by Femtosecond Laser Induced Material Ejection and Redistribution

Additive and Substractive Surface Structuring by Femtosecond Laser Induced Material Ejection and Redistribution

Injection of a microtextured polymer part surface: Influence of experimental parameters on the replication rate

Modification of Ti6Al4V surface properties by combined DLW-DLIP hierarchical micro-nano structuring

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