Formation of nanosized alumina particles in pulsed wire discharge

Abstract

Phenomena in pulsed wire discharge of Al wires to synthesize nanosized alumina powders were analyzed by using a high-speed infrared thermometer, in order to investigate the formation mechanism of nanosized alumina particles during the discharge. Temperatures of Al wires were measured during the experiments of pulsed wire discharge at various kinds of conditions. Abrupt increase of temperature and following decrease were recognized by the measurement in each pulsed wire discharge at all conditions. Another temperature increase was found after the first decrease of temperature in the cases of pulsed wire discharge in oxygen and air atmosphere.