Preparation of Nanosized Powders by Pulsed Wire Discharge and the Grain Size Control Method

Abstract

Characteristics of pulsed wire discharge (PWD) for preparation of nanosized powders is described in this review paper. Firstly, principle of the high energy conversion efficiency is explained. Secondly, the high speed photographs of plasma and prepared grains in the PWD processes with various conditions are presented. Finally, a grain size determining factor is proposed and validity of the equation derived assuming ideal gas and Brownian motion is discussed using the obtained volumes of plasma and median diameters of the grains.