Effect of Thermophysical and Mechanical Properties of the Substrate on the Normal Adhesion of Ni-Cr-Fe Coatings Deposited by Thermal Spray

Résumé

Thermal spray process is used to obtain high quality coatings that improve corrosion resistance, mechanical and tribological properties, in various technical applications: auto parts, turbine elements, in the naval industry. It aims at the increase service life of components, greater reliability and a higher degree of safety. A major contribution to achieving these goals is due to the good adhesion of the coating to the substrate. Generally, spray distance, design speed powders, powders nature, source temperature (flame, arc, plasma) are the most analyzed parameters in the thermal spray process. But, substrate roughness can strongly influence the performance of the coatings. The aim of this paper is to present the effect of substrate roughnes on the normal component of the adhesion of Ni-Cr-Fe coatings.