Communication Dans Un Congrès Année : 2015

Effect of Substrate Roughness on the Cratering Phenomenon on the Surface of Cold Sprayed Coating

Résumé

Cold Spray is a material deposition process where the effects of substrate roughness on cratering phenomenon are often observed. In order to understand and explain crater formation on cold sprayed coatings, the laser surface texturing technique is used. This innovative process allows to control the substrate surface roughness and to create a controlled topography. In this study, five hole sizes from 20 to 100 μm diameters with an angle of 45° were drilled to obtain different working craters. Subsequent, build up of the coating was investigated. Aluminum powder and nitrogen were used for this study. The main gas temperature and pressure were respectively 500°C and 3MPa. The morphology and the microstructure of aluminum coatings were characterized by optical microscopy and scanning electron microscopy. Surface improperly filled crater affects bond strength. The objective is to determine the effect of surface morphology on craterisation weakening the bond strength. The erosion velocity creates locally a hydrodynamic penetration leading to strong erosion.

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Dates et versions

hal-05458902 , version 1 (14-01-2026)

Identifiants

Citer

Sébastien Gojon, Robin Kromer, Sophie Costil, Guillaume Douchy, Christophe Verdy, et al.. Effect of Substrate Roughness on the Cratering Phenomenon on the Surface of Cold Sprayed Coating. International Thermal Spray Conference (Thermal Spray 2015) : Advanced Coatings for Aerospace Components, Thermal Spray Society (TSS), May 2015, Long Beach (California), United States. pp.339-344, ⟨10.31399/asm.cp.itsc2015p0339⟩. ⟨hal-05458902⟩
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