JP2588875B

PURPOSE:To eliminate the deterioration of dispersibility of magnetic iron powder to paint with uniform particle diameter distribution even if the powder is finely pulverized by specifying a mean long axis diameter and axis ratio. CONSTITUTION:An aqueous ferrous iron solution is added to an aqueous a...

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Main Authors OOTA ISAO, SAITO FUMIO, YUKI SHINICHI, HIRANO SHINYA, MINESHITA OSAMU, TSUNODA MAKOTO, MURAKAMI AKIRA, MUNECHIKA TETSUE
Format Patent
LanguageEnglish
Published 12.03.1997
Edition6
Subjects
BASIC ELECTRIC ELEMENTS
CASTING
ELECTRICITY
INDUCTANCES
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
MAGNETS
MAKING METALLIC POWDER
MANUFACTURE OF ARTICLES FROM METALLIC POWDER
PERFORMING OPERATIONS
PHYSICS
POWDER METALLURGY
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
TRANSPORTING
WORKING METALLIC POWDER
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Summary:PURPOSE:To eliminate the deterioration of dispersibility of magnetic iron powder to paint with uniform particle diameter distribution even if the powder is finely pulverized by specifying a mean long axis diameter and axis ratio. CONSTITUTION:An aqueous ferrous iron solution is added to an aqueous ammonium carbonate solution, oxygen-containing gas is diffused to produce goethite, which is coated with silicide and/or aluminum compound, reduced at 300-500 deg.C in a hydrogen gas stream to obtain spindle-like magnetic iron powder having 0.03-0.5mum of mean long axis diameter and 3-9 of axis ratio. Silicide such as water glass, silicic soda or colloidal silica and aluminum compound such as aluminic soda, aluminum nitrate or aluminum phosphate are used solely or in combination as surface treating agents for preventing the powder from sintering and controlling the magnetic property at reducing time. Thus, the collapse of the shape of the powder and flocculation among the powder particles are eliminated to improve the dispersibility in paint.
Bibliography:Application Number: JP19860102696