METHOD OF PRODUCING HIGHLY POROUS METAL MATERIALS BASED ON HOLLOW NANOSTRUCTURED MICROSPHERES OF METALS Russian patent published in 2022 - IPC B22F3/11 C22C1/08 B22F3/87 

FIELD: powder metallurgy.

SUBSTANCE: invention relates to methods of producing highly porous cellular materials. Can be used to produce filters, catalyst carriers, noise and sound absorbers, materials for absorption and shielding of electromagnetic radiation, energy absorbers caused by plastic deformation of material, protection against vibrations, heat exchangers in power engineering, machine building and chemical industry. Powder of nanostructured metal microspheres is poured into the mold matrix equipped with upper and lower punches. Matrix is placed in the working chamber of the spark plasma sintering unit and heated at rate of 10–600 °C/min up to 400–800 °C by passing high-frequency current from 3,000 to 60,000 amperes through matrix and powder while providing pressure on matrix side walls from 10 MPa to 100 MPa with subsequent holding from 1 sec to 30 min and cooling in free mode at rate of 10–600 °C/min.

EFFECT: obtaining material with porosity of more than 90 %, preserving the initial phase composition, improving thermophysical and electromagnetic screening properties, increasing Young's modulus.

4 cl, 1 tbl, 3 ex, 4 dwg