Al, Cu and W Oxide Fine Particles Produced by Discharge Explosions

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Abstract
When a large current produced by the discharge of a charged capacitor is introduced to Al, Cu and W wires in air, it evaporates the wires explosively, and metal oxide fine particles are thus produced. The resulting fine particles are γAl2O3, Cu2O and WO3, and their average diameters are 200, 200 and 100 Å, respectively. Comparison of smoke balls produced by the discharge-explosion method (DEM) and those produced by the conventional gas-evaporation method (CGEM) shows that the size of the smoke balls produced by the DEM was ten times or more greater than that of smoke balls produced by the CGEM. In terms of the diameters of particles, the size produced by the DEM was, at most, one-tenth that produced by the CGEM.