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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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 ...
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PHIPPS, Claude R.; BONNAL, Christophe; MASSON, Frédéric; BOUSTIE, Michel; BERTHE, Laurent; SCHNEIDER, Matthieu; BATON, Sophie D; BRAMBRINK, Erik; CHEVALIER, Jean Marc; VIDEAU, Laurent; BOYER, Séverine A.E (Elsevier Ltd, 2018)New data on some materials at 80ps pulse duration and 1057 nm wavelength give us the option of proportionally combining them to obtain arbitrary values between 35 (aluminum) and 800 N/MW (POM, polyoxymethylene) for momentum ...
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