METHOD FOR OBTAINING COMPOSITE POWDER MAGNETIC MATERIAL OF FERROMAGNETIC-DIAMAGNETIC SYSTEM

摘要

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. ^ 1 tbl, 2 ex