PROCESS OF MANUFACTURE OF FINELY DIVIDED POWDER MATERIALS Russian patent published in 1994 - IPC

Abstract RU 2023319 C1

FIELD: powder metallurgy. SUBSTANCE: solution of sulfuric acid salts of Fe, Zn and Ni is used to produce nickel-zinc ferrite having stoichiometric composition 1:64: 0.36, 10% solution of ammonium carbonate (NH₄)₂CO₃ is added into it. Dispersing to drops having sizes 0.05-0.3 mm, freezing in liquid nitrogen and sublimation drying (dehydration) are conducted at 50-80 C of heater, desublimator temperature - 60 C and pressure 0.2 mm Hg in apparatus. Thermolysis of (NH₄)₂CO₃ is performed at temperature 58-60 C. Specific surface of sublimated powder frozen with ammonium carbonate is 6.8 sq.m/g. EFFECT: facilitated manufacturing process.

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RU 2 023 319 C1

Authors

Gulevich V.I.

Brazhnikov S.M.

Volynets A.Z.

Dates

1994-11-15—Published

1991-05-05—Filed