Abstract
Electrically exploding wire can be manipulated to produce nanometer-sized metal powder. Evolutionary characteristics directly affect the size of the grains formed in this process. Nanosecond laser pulses are adopted in this study to acquire photos of the explosion, wherein the explosive area has distinct margin lines within an interference fringe background. The lines are easily abstracted by recognizing disturbed sections of the stripes. The three-dimensional distribution of the metal powder at the measuring moment is determined according to the transmittance by which the laser beam penetrates the metal mist. Experimental results show that the diameter of metal wires expands from 0.3 mm to 4.7 mm 0.5 us after electrification, and expands to 28 mm by 18 us. The maximum concentration of particles decreases from 3×1021/cm3 to 1.1×1020/cm3. Throughout the expansion process, the particle concentration distribution presents multiple ring belts along the radial direction.
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