ALUMINUM SPHERICAL-GRAIN FINELY DISPERSED POWDER AND METHOD FOR MAKING IT Russian patent published in 2005 - IPC

FIELD: powder metallurgy, manufacture of finely dispersed powders with improved physical and chemical properties, namely of aluminum-zinc powder with spherical grains.

SUBSTANCE: aluminum powder with spherical grains according to invention has specific surface no less than 0.7 sq. m/g at next content of particles by mass, %: less than 1.0 micrometer, 8 - 12; 1 - 3 micrometers, 53 - 77; 3 - 5 micrometers, 15 - 38; more than 5 micrometers, no more than 10. Method for producing powder comprises steps of pulverizing melt with use of compressed gaseous nitrogen for receiving poly-dispersed pulverized product; extracting powder from pulverized product due to sorting by size fractions. Melt is pulverized by means of compressed gaseous nitrogen containing 0.1 -0.4 vol. % of oxygen at temperature of gas 550 -680 C, gas pressure in jet 5 - 6 Mpa, gas flow rate 600 - 1200 cub. nm/h. Temperature of melt is sustained in range 850 - 990 C.

EFFECT: possibility for producing powders of predetermined chemical content and fraction size, enhanced safety of manufacturing process.

4 cl