METHOD OF POWDER MAGNETIC SUBSTANCE RECEIVING Russian patent published in 2009 - IPC H01F1/20 B22F1/00 C22C33/02 

FIELD: metallurgy.

SUBSTANCE: invention concerns powder metallurgy. Particularly it concerns receiving of ferromagnetic powder materials. It can be used at manufacturing of composite products and coatings of high frequency and microwave frequency ranges for biological shielding against strong radiation, screening of rooms and equipment of anechoic chambers, resolution of interference protection and electromagnetic compatibility of electronic device, reduction of radiolocating perceptibility of different objects, devices of radio engineering and automation. Powders of carbonyl iron and electrolytic cobalt are subject to grinding in high-energy middlings in medium of spirits. Ratio liquid:powder is not lower than 1:1.5. It is received powder material with specific surface 0.2-3.5 m²/g and value of magnetic loss tangent more than 1.0 in bandwidth more than 1.5 GHz. After grinding it is implemented drying at temperature not more than 80°C.

EFFECT: receiving of material, which allows high microwave frequency magnetic losses, provides high performance of radio absorption, reduction of coating thickness for microwave radiation.

3 cl, 1 dwg, 3 ex