Laser surface patterning to enhance adhesion of plasma sprayed coatings
TypeArticles dans des revues avec comité de lecture
In thermal spraying, adhesive bond strength is a feature of surface properties. An adapted surface is studied with prior-surface treatments to enhance interface energy. This study deals with Ni–Al coatings on 2017 aluminum alloy substrate produced by atmospheric plasma spraying. The adherence was evaluated with several controlled surface topographies obtained by grit-blasting and laser surface texturing technique. Adherence has been tested with two different techniques: pull-off test and LASer Adhesion Test. They induce different stresses at the interface. The results showed that the adhesive strength is mostly controlled by a contact adhesion area. A large contact area increases the energy release rate at the interface during coating failures. The bond strength tendency for the two adherence tests is similar: apparent adherence is tripled thanks to laser surface patterning. Fracture propagation is stopped nearby laser-induced holes due to the complex shape and has to deviate inside the coating to maintain crack propagation (inter-splat cracks). The energy at the interfaces being stored locally due to pattern: pattern morphology, pattern localization and powder feed rate are important factors that control the adhesion strength of the thermally sprayed coatings.
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COURAPIED, Damien; KROMER, Robin; BERTHE, Laurent; PEYRE, Patrice; COSTIL, Sophie; CORMIER, Jonathan; BOUSTIE, Michel; MILHET, Xavier (Laser Institute of America, 2016)The laser shock adhesion test (LASAT) is a technique allowing the generation of high tensile stresses in materials. The LASAT consists in focusing a pulsed laser beam on a water-confined target. The laser pulse crosses the ...
Laser Patterning Pretreatment before Thermal Spraying: A Technique to Adapt and Control the Surface Topography to Thermomechanical Loading and Materials KROMER, Robin; COSTIL, Sophie; CORMIER, Jonathan; BERTHE, Laurent; PEYRE, Patrice; COURAPIED, Damien (Springer New York LLC, 2016)Coating characteristics are highly dependent on substrate preparation and spray parameters. Hence, the surface must be adapted mechanically and physicochemically to favor coating–substrate adhesion. Conventional surface ...
High temperature durability of a bond-coatless plasma-sprayed thermal barrier coating system with laser textured Ni-based single crystal substrate KROMER, Robin; PEYRE, Patrice; BERTHE, Laurent; COURAPIED, Damien; COSTIL, Sophie; CORMIER, Jonathan (Elsevier, 2018)Thermal barrier coating systems are usually build-up with bond coats to ensure a good adhesion of the ceramic top coat and to protect the substrate against oxidation and corrosion. Such system is often subjected to complex ...
COURAPIED, Damien; BERTHE, Laurent; PEYRE, Patrice; COSTE, Frédéric; ZOU, J-P; SAUTIVET, A.-M. (The Laser Institute of America, 2015)This paper investigates the different physical processes involved during laser-delayed double shock-wave generation in water-confined geometry. With this technique, two laser pulses, separated by a Δt duration, irradiate ...
BERTHE, Laurent; COURAPIED, Damien; EL KARNIGHI, Samy; PEYRE, Patrice; GORNY, Cyril; ROUCHAUSSE, Yann (Laser Institute of America, 2017)This paper presents a study on the confined interaction with water flow for two successive laser pulses. The dynamic of the renewal of water films after shock produced by the laser is observed using a high speed camera. ...