When a particulate material under molten or dissolved state is atomized by means of a fluid nozzle or a rotary disc type atomizer, a high voltage is applied to obtain particles which are uniform in shape and, for example, spherical with a narrow particle size distribution. Further, if necessary, the...http://www.google.ca/patents/US4599294?utm_source=gb-gplus-sharePatent US4599294 - Particles obtained by atomization while applying voltage
