Application of laser shock adhesion testing to the study of the interlamellar strength and coating–substrate adhesion in cold-sprayed copper coating of aluminum

Barradas, Sophie; Molins, Régine; Jeandin, Michel; Арригони, М.; Boustie, M.; Bolis, C.; Berthe, Laurent; Ducos, M.

doi:10.1016/j.surfcoat.2004.08.222

Cited by 72 publications

(32 citation statements)

References 5 publications

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“…For splats, in contrast to the one-dimensional method (Ref [16][17][18], laser interferometry resulted in measuring the substrate top surface velocity. This was used to calibrate LASATesting numerical simulations before the corresponding traction at interface was calculated.…”

Section: Tensile Test Modelingmentioning

confidence: 99%

Influence of Particle Velocity on Adhesion of Cold-Sprayed Splats

et al. 2009

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In cold spray, innovative coating process, powder particles are accelerated by a supersonic gas flow above a certain critical velocity. Particles adhesion onto the substrate is influenced by particle impact velocity, which can change dramatically depending on particle position from the core of the jet. In the present work, an original experimental set-up was designed to discriminate the particles as a function of the levels of velocity to investigate the influence of this parameter on adhesion. Particles at given positions could therefore be observed using scanning electron microscope, which showed different morphologies as a function of impact velocity. High pressure and temperature at the interface during impact were calculated from numerical simulations using ABAQUS Ò . Transmission electron microscope analyses of thin foils were carried out to investigate into resulting local interface phenomena. These were correlated to particle impact velocity and corresponding adhesion strength which was obtained from LAser Shock Adhesion Test.

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Section: Tensile Test Modelingmentioning

confidence: 99%

Influence of Particle Velocity on Adhesion of Cold-Sprayed Splats

et al. 2009

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“…LASAT was used to measure the adhesion of the coatings and has been described in detail in previous articles (Ref [37][38][39][40][41][42][43][44][45][46]. Basically, LASAT consists in irradiating the rear surface of a substrate with a laser to generate a shock wave.…”

Section: Laser Shock Adhesion Test (Lasat)mentioning

confidence: 99%

Cold-Spraying Coupled to Nano-Pulsed Nd-YaG Laser Surface Pre-treatment

et al. 2010

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Cold-spraying coupled to nano-pulsedThe effect of Al2017 substrate pre-treatment using pulsed laser ablation on adhesion strength of coldsprayed Al coating is examined. A high energy pulsed laser beam was coupled with a cold-spray gun to result in laser ablation of the substrate surface a few milliseconds prior to the deposition. The influence of the laser fluence and repetition rate on substrate surface morphology and physico-chemical properties are investigated. Coating-substrate interfaces were observed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) of thin foils which were prepared using focused ion beam (FIB). Adhesion strength was evaluated by means of finite element method (FEM) of LAser Shock Adhesion Tests (LASAT). The results are compared to samples prepared on as received substrate, and pre-treated by two conventional methods, namely polishing and grit-blasting. It is shown that the coatingsubstrate interface is significantly improved when pulsed laser ablation is performed at optimized parameters. No oxide layer was found at the coating-substrate interface on laser ablated sample while two oxide layers were found on the as-received sample indicating that particle impingement transformed the native alumina layer in an amorphous Al oxide phase. The observations allow concluding that bonding of cold spray Al particles on Al2017 substrate requires either the removal of the native oxide layer or its transformation in an amorphous Al oxide phase.

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“…Indeed, if the location of the tensile stresses is close to an interface, the local tensile stress generated in the material could result in the debonding of the interface. [9][10][11][12][13] The paper presents here below a new approach in order to improve the technique and control the location of the tensile stresses.…”

Section: Introductionmentioning

confidence: 99%

Laser-delayed double shock-wave generation in water-confinement regime

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Berthe

Peyre

et al. 2015

Journal of Laser Applications

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This paper investigates the different physical processes involved during laser-delayed double shockwave generation in water-confined geometry. With this technique, two laser pulses, separated by a Dt duration, irradiate a target immersed in water at an intensity of a few GW/cm 2 and form a high pressure plasma which results in a double shock-wave generation. This 2 pulses configuration is currently being investigated as an attractive method for improving the LASer Adhesion Test (LASAT) [L. M. Barker and R. E. Hollenbach, J. Appl. Phys. 43, 4669-4674 (1972)] technique by adapting the time delay Dt to the position of interfaces. The LASAT technique is a noncontact adhesion test allowing to generate a high-level tensile stress near interfaces with the use of laser-driven shock wave. The generation of two delayed high-intensity shock waves by laser plasma in the water-confinement regime has been investigated at 10ns@532 nm with the new Nd:YAG laser GAIA from Thales Laser company in the new facility HEPHAISTOS. For each incident Gaussian laser impulsion, the characterization of the high-amplitude laser-plasma-generated shock wave and its propagation through the target has been performed using a velocity interferometer system for any reflector [L. Berthe et al., "State-of-the-art laser adhesion test (LASAT)," Nondestr. Test. Eval. 26(3-4), 303-317 (2011)]. The new laser facility allows us a nanosecond-control of the time delay between the two laser pulses and a precise control of each laser maximum-intensity. Therefore, the influence of the first laser-induced plasma, on the second shock-wave generation has been studied by modifying different parameters such as the delay Dt and the intensity I1 and 12 of each pulse and different aluminum plate thicknesses from 0.2 to 1.5 mm. Preliminary tests show that the maximum pressure level of the second generated shock wave is sensitive to the time delay between the two impulsions and influenced by the plasma generated by the first laser pulse. V C 2015 Laser Institute of America.

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Application of laser shock adhesion testing to the study of the interlamellar strength and coating–substrate adhesion in cold-sprayed copper coating of aluminum

Cited by 72 publications

References 5 publications

Influence of Particle Velocity on Adhesion of Cold-Sprayed Splats

Influence of Particle Velocity on Adhesion of Cold-Sprayed Splats

Cold-Spraying Coupled to Nano-Pulsed Nd-YaG Laser Surface Pre-treatment

Laser-delayed double shock-wave generation in water-confinement regime

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