The influence of parameters of high-voltage electric spark dispersion of materials on the granulometric composition of nanopowders of metals and alloys is considered. The most interesting feature of the developed experimental setup is the presence of an air discharge gap (FV1), which creates an overvoltage on the working discharge gap (FV2). The discharge gaps form a voltage divider when the capacitor (C) is discharged. It was assumed that the voltage divider should have a significant impact on the operation of the experimental setup. Studies have shown that when the air gap (FV1) is much larger than the working gap (FV2), their exact ratios do not affect the size of the resulting nanoparticles. At such ratios of discharge gaps, the voltage divider allows to regulate only the performance of the process of obtaining nanopowders. The resulting silver nanopowders had a spherical shape and a rather narrow size distribution. It is necessary to further study the process of high-voltage spark dispersion of materials with a significant overvoltage of the discharge gap.
In this paper, we study the process of obtaining silver nanoparticles by the method of electrospark erosion of silver electrodes in distilled water with a significant overvoltage of the electrode gap. Studies were conducted on the previously developed experimental setup. The results showed that when the air discharge gap FV1 is much larger than the working discharge gap FV2, their exact ratios do not affect the particle size of the nanopowder. The particle size of the nanopowder is determined by other, not yet established process factors. Manufactured nanopowders have the same average size for all production modes and are characterized by a small scatter of particle sizes. The development of the process of obtaining silver nanoparticles by the method of electrospark erosion will reduce the cost of conductive inks and pastes in the future.
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