FEATURES OF LIQUIDS PENETRATION IN POWDER MATERIALS

Abstract

Establishment of features and regularities of penetration of liquids into powder materials. Studies have shown that highly dispersed powders in air are in an aggregated state. Primary particles with a radius of 0.12 to 6.3 nm have the greatest ability to aggregate. The introduction of powder materials into the liquid dispersion medium allows to weaken the interparticle interaction in the system and thus reduce the number of aggregated particles due to re-dispersion.

The destruction of aggregates of particles formed in the air in two stages. In the first stage of destruction, the liquid spreads on the surface of the powders and areas of closed air between the particles are formed. The condition for spreading the liquid on the surface of the powder is wetting the powder with liquid. The rate of liquid penetration into the powder pores depends on the combined effect of the characteristics of the liquid and the dispersion phase, in particular the viscosity and density of the liquid dispersion medium, as well as the surface tension