Combined plasma spray and in situ laser melting treatment of NiCrBSi powder
Résumé
Recently, mechanical industry has been affected by many environmental regulations. For example, hexavalent chromium was prohibited due to its toxicity. Thus it is essential to find new coatings which are able to replace hard chromium plating. In this paper a technique, based on the association between APS (Atmospheric Plasma Spray) and laser melting using a 3kW diode laser is described. This process allows the production of denser coatings with finer structures than as-sprayed coatings. Depending on the processing parameters the mechanical properties, studied by nanoindentation, microhardness measurement and tribological ball-on disc experiments, were improved in terms of hardness and wear resistance.
Domaines
Matériaux
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