Surface Patterning of Metal Substrates Through Low Power Laser Ablation for Enhanced Adhesive Bonding

Alfano, Marco; Pini, Stefano; Chiodo, Giovanni; Barberio, M.; Pirondi, A.; Furgiuele, Franco; Groppetti, R.

doi:10.1080/00218464.2013.871538

Cited by 50 publications

(35 citation statements)

References 16 publications

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“…Therefore, the improvement in adhesive bonding after PLA is attributed to the increase in surface area, the generation of surface features, also of sub-micron scale, which improved wetting and acted as locking sites enabling mechanical interlocking [8,9,12,14]. It has been observed in previous related work that all these effects combined may also lead to the formation of a composite interfacial region (i.e.…”

Section: Mechanical Testsmentioning

confidence: 94%

“…On top of this, PLA improves bond repeatability, as well as waste and cost reduction, and is also prone to automation. Previous literature works have indicated that PLA promotes significant modifications of surface morphology [8,9] and chemistry [10,11], leading to improvement in surface wetting [12,13] and mechanical interlocking [12,14], with consequent increases in bond toughness [15,16] and long term joint stability [18]. It may also outperform traditional joining techniques, such as riveting and fusion welding when dealing with dissimilar materials [19].…”

Section: Introductionmentioning

confidence: 99%

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Improving adhesion of copper/epoxy joints by pulsed laser ablation

Hernandez

Alfano

Lubineau

et al. 2016

International Journal of Adhesion and Adhesives

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The purpose of the present work is to survey the effect of pulsed laser ablation on copper substrates (CuZn40) deployed for adhesive bonding. Surface pre-treatment was carried using an Yb-fiber laser beam. Treated surfaces were probed using Scanning Electron Microscopy (SEM) and X-Ray Photoelectron Spectroscopy (XPS). The mechanical performance of CuZn40/epoxy bonded joints was assessed using the T-peel test coupon.In order to resolve the mechanisms of failure and adhesive penetration within surface asperities induced by the laser treatment, fracture surfaces were surveyed using SEM.Finite element simulations, based on the use of the cohesive zone model of fracture, were carried out to evaluate the variation of bond toughness. Results indicated that the laser ablation process effectively modifies surface morphology and chemistry and enables enhanced mechanical interlocking and cohesive failure within the adhesive layer.Remarkable improvements of apparent peel energy and bond toughness were observed with respect to control samples with sanded substrates.

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Section: Mechanical Testsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Improving adhesion of copper/epoxy joints by pulsed laser ablation

Hernandez

Alfano

Lubineau

et al. 2016

International Journal of Adhesion and Adhesives

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“…7 (a) and (b)) show that the surface obtained as a result of laser ablation is rougher than that obtained using sanding. High surface roughness is usually attributed to better interlocking and can result in better adhesion between two joining surfaces (the electrode and the laminate) [39,40].…”

Section: Assessment Of Modifications In the Surface Morphologymentioning

confidence: 99%

“…From this standpoint, pulsed laser irradiation has recently been shown to be a very effective surface modification technique for a variety of materials. 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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“…As a result, there is a growing need to replace processes requiring the use of hazardous substances with environmentally friendly alternatives. Recent studies highlighted the great potential underlying the use of modern laser beams [4,5]. Laser irradiation can lead to the formation of a thin oxide layer featuring a nanostructured morphology and which actually resembles that obtained by means of chemical treatments [2,[6][7][8].…”

Section: Introductionmentioning

confidence: 99%