Abstract
It is scientifically proven that reducing the particle size in metal powders leads to a noticeable improvement in the materials properties. The shape of powder particles and their nanoscale are of great importance in sintering technologies for the formation of dense homogeneous alloys, as well as in additive manufacturing. A negative feature of nanoparticles is that they can stick together and form agglomerates and aggregates. (Research purpose) The research purpose is in proving the influence of ultrasound on the dispersion of metal powders, as well as studying the issue of preventing sticking of particles of powder materials with the help of surfactants. (Materials and methods) The article presents conducted tests at the Lomonosov Moscow state University. Authors used three brands of powder obtained by electroerosive dispersion (T15K6, Lc38mts2 and Brazh9-12), a high-class portable digital ultrasound device of the Logiq-E series, a scanning electron microscope of the DESK-TOP AURA series, and a Spectro-photocolorimeter “Spekol-210”. (Results and discussion) A suspension of metal powders in distilled water was subjected to ultrasound for 1, 5 and 10 minutes. The percentage of particles of three fractions was studied on a scanning microscope: 40-150; 150-300 and more than 300 nanometers. Polyethylene glycol PEG-35 was introduced into the suspension in different proportions to study the effect of surfactants. Solutions were studied using a spectrophotometric method to determine the adsorption of surfactants on the filler. (Conclusions) The effect of ultrasound on the dispersion of metal powders has been proved. It was hypothesized that conducting the process of electroerosive dispersion in an ultrasonic field can provide a better quality powder material. Studies with the use of surfactants have shown the prospects of their use for adsorption modification of metal fillers in order to improve the adhesion properties.
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