Direct Laser Interference Patterning of tetrahedral amorphous carbon films for tribological applications

Roch, Teja; Weihnacht, Volker; Scheibe, H.‐J.; Roch, Aljoscha; Lasagni, Andrés Fabían

doi:10.1016/j.diamond.2012.12.002

Cited by 35 publications

(38 citation statements)

References 16 publications

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“…For instance, it can be used to improve adhesion between metals and epoxy resin [39,40], but also for precision material cutting and/or drilling [36] on a variety of materials including composites [59,54,43]. Moreover, it has been recently employed to enhance the tribological behavior of steel and diamond coatings [41,58].…”

Section: Introductionmentioning

confidence: 99%

Laser-based surface preparation of composite laminates leads to improved electrodes for electrical measurements

Almuhammadi

Selvakumaran

Alfano

et al. 2015

Applied Surface Science

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Laserbased surface preparation of composite laminates leads to improved electrodes for electrical measurements, Applied Surface Science (2015), http://dx.doi.org/10.1016/j.apsusc. 2015.10.086 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Page 1 of 32 A c c e p t e d M a n u s c r i p t AbstractElectrical impedance tomography (EIT) is a low-cost, fast and effective structural health monitoring technique that can be used on carbon fiber reinforced polymers (CFRP). Electrodes are a key component of any EIT system and as such they should feature low resistivity as well as high robustness and reproducibility. Surface preparation is required prior to bonding of electrodes. Currently this task is mostly carried out by traditional sanding. However this is a time consuming procedure which can also induce damage to surface fibers and lead to spurious electrode properties. Here we propose an alternative processing technique based on the use of pulsed laser irradiation. The processing parameters that result in selective removal of the electrically insulating resin with minimum surface fiber damage are identified.A quantitative analysis of the electrical contact resistance is presented and the results are compared with those obtained using sanding.

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Section: Introductionmentioning

confidence: 99%

Laser-based surface preparation of composite laminates leads to improved electrodes for electrical measurements

Almuhammadi

Selvakumaran

Alfano

et al. 2015

Applied Surface Science

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“…From previous experiments it is known that smaller contact areas between frictional partners are beneficial for lower friction [12]. Consequently ultra-low friction in a ball on disk setup was demonstrated when both frictional partners were line-like patterned [16].…”

Section: Interference Patterning Of Ta-cmentioning

confidence: 98%

“…But the surface patterns on the ta-C resulted in an increased friction coefficient as well as the destruction of the ta-C thin film. In contrast, direct laser interference patterning (DLIP) of ta-C films could demonstrate that a reduction of the friction coefficient using dot-like and line-like patterns with spatial periods of 5 μm is possible [12]. Otherwise, at the moment any studies describing the effect of laser induced graphitization as well as the spatial period size on the COF of DLIP-patterned ta-C and steel (100Cr6), respectively.…”

Section: Introductionmentioning

confidence: 94%

“…[18]). The thermal diffusivity is calculated according to Ref [12]. The detailed parameters used in this simulation are given in Table 2.…”

Section: Thermal Simulation Of Interference Patterning Of Ta-cmentioning

confidence: 99%

“…In contrast to stochastical surface topographies, specific deterministical (periodic) patterns can be used to reduce adhesive forces, to trap abrasion particles, or to build up hydrodynamic pressure by the introduction of lubricant reservoirs [12][13][14]. A technology that offers a high degree of flexibility in the surface pattern geometries is direct laser patterning.…”

Section: Introductionmentioning

confidence: 98%

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Dependence between friction of laser interference patterned carbon and the thin film morphology

Roch

Benke

Milles

et al. 2015

Diamond and Related Materials

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Positive Effect of Periodic Micropatterns on Compression Ring Friction

Michelberger

Schell

Jaitner³

et al. 2023

Adv Eng Mater

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Internal combustion engines are increasingly regulated in regard to efficiency and environmental impact, which requires advanced optimization strategies of engine components. The contact between the top ring and the cylinder liner is critical to the efficiency of an internal combustion engine. As shown in a previous study, an amorphous carbon coating can greatly improve the friction properties of piston rings. This work expands on these results by fabricating laser‐interference‐induced microchannels on the coating perpendicular to the direction of movement with a mean depth of 0.97 and 3.13 μm spatial period to further optimize the tribology. Fired single‐cylinder engine measurements of the microtextured rings show a significant reduction in mean piston assembly friction of 5% for operation points that are relevant for urban transportation and up to 10% for specific operation points. Subsequent multibody elastohydrodynamic simulations prove that measured friction changes result from the compression ring microtexture. In particular, the microtexture increases the hydrodynamic pressure, reduces hydrodynamic losses, and leads to 20% lowered compression ring losses for an entire combustion cycle of the investigated operation point. In the future, such tribological concepts can be deployed in internal combustion engines that are powered by sustainable hydrogen or methanol.

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Direct Laser Interference Patterning of tetrahedral amorphous carbon films for tribological applications

Cited by 35 publications

References 16 publications

Laser-based surface preparation of composite laminates leads to improved electrodes for electrical measurements

Laser-based surface preparation of composite laminates leads to improved electrodes for electrical measurements

Dependence between friction of laser interference patterned carbon and the thin film morphology

Positive Effect of Periodic Micropatterns on Compression Ring Friction

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