Preparation of spherical ultrafine cobalt powder by polyol reducing

The ultrafine, monodispersed, spherical cobalt powder has been fabricated by reducing cobalt hydroxide with glycol. It were investigated that the effect of NaOH concentration on the reaction rate and the effects of the concentration of cobalt hydroxide and surfactant on the morphology and particle size. The particles were characterized by the X-ray diffraction(XRD), scanning electron microscope(SEM), laser diffraction particle size analyzer and BET specific surface analyzer respectively. The XRD shows that the cobalt powders exist mostly in face centered cubic (fcc) structure, a little in simple hexagonal. The cobalt powders prepared at Co(OH)(2) 150g/L, NaOH 40g/L and surfactant 30g/L, its average particle size, specific surface area and cobalt content, were 0.88 mu m, 2.705m(2)/g. and more than 99.5% respectively.