METHOD FOR OBTAINING COMPOSITE POWDER MAGNETIC MATERIAL OF FERROMAGNETIC-DIAMAGNETIC SYSTEM Russian patent published in 2012 - IPC C22C1/05 B22F9/02 B22F1/00 B82B3/00 

FIELD: metallurgy.

SUBSTANCE: composite particles of powder material of ferromagnetic-diamagnetic system are obtained by combined treatment of powders of polymer diamagnetic matrix and ferromagnetic reinforcing component in quantity of 20-50%. Powder of polymer matrix represents disperse particles with particle size of 0.5-1.5 mm. Powder of ferromagnetic component represents nanocrystalline powder with particle size of 1-50 mcm. Superhigh-speed mechanical synthesis of mixture is performed in high-speed disintegrator at relative movement speeds of striking elements of 220-250 m/sec and frequency of strikes of 3000-5000 strikes/sec. The obtained composite powder contains particles with amorphism degree of not more than 80% and magnetic permeability of up to 90 and more.

EFFECT: possibility of obtaining radar absorbent materials with high screening efficiency and high value of absorption coefficient within the frequency range of 1 MHz to 40 GHz.

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