par Delplancke, Jean-Luc ;Di Bella, V.;Reisse, Jacques ;Winand, René
Référence Materials Research Society symposia proceedings, 372, page (75-81)
Publication Publié, 1995
Article révisé par les pairs
Résumé : Metal powders with a diameter ranging from 20 to 50 micrometers are currently produced by electrolysis at high current density in aqueous electrolytes. A lot of research is then devoted to produce by electrolysis and with a high yield, ultrafine metal powders. Two main techniques are actually developed: strong electrolyte stirring and pulsed currents in order to obtain high current densities and accordingly, high nucleation rates and small nuclei diameters. By combining pulsed current and pulsed ultrasound on the same electrode surface, it has been possible to produce by electrolysis, with a yield ranging from 80 to 95%, crystalline metal powders with a sharp diameter distribution around 100 nm. Possible explanations of these results are presented. This new technique, called sonoelectrochemistry, is illustrated by metal powders analyzed by HRTEM, X-ray diffraction and laser diffusion. The perspectives of sonoelectrochemistry for the production of metal or ceramic nanopowders are studied.