Theoretical and practical results of research of influence duration of ultrasound treatment on the particle size distribution in powder are received. It is established that ultrasound treatment promotes intensive destruction of aggregates only in the initial period of processing. The efficiency of disaggregation of powders at a frequency of 18-44 kHz does not exceed 20%. It is shown that the efficiency of disaggregation of ultradispersed powders can be increased by treatment under reduced hydrostatic pressure.
powder, ultrafine additive, aggregates, disaggregation, ultrasound, cavitation
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