PRODUCTION OF MAGNETIC METAL POWDER

PURPOSE:To provide an industrially advantageous production of a magnetic metal powder which is very appropriately used for the magnetic recording medium. CONSTITUTION:The magnetic metal powder is produced by coating the surface of a needle-like particle of hydrous iron oxide with at least one compou...

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Bibliographic Details
Main Authors HATANAKA KENJI, KAWAMURA TOSHIHIKO, NOMURA EIJI, MORIYAMA NARIAKI
Format Patent
LanguageEnglish
Published 29.11.1994
Edition5
Subjects
BASIC ELECTRIC ELEMENTS
CASTING
CHEMISTRY
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
ELECTRICITY
INDUCTANCES
INORGANIC CHEMISTRY
MAGNETS
MAKING METALLIC POWDER
MANUFACTURE OF ARTICLES FROM METALLIC POWDER
METALLURGY
PERFORMING OPERATIONS
POWDER METALLURGY
SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
TRANSFORMERS
TRANSPORTING
WORKING METALLIC POWDER
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Summary:PURPOSE:To provide an industrially advantageous production of a magnetic metal powder which is very appropriately used for the magnetic recording medium. CONSTITUTION:The magnetic metal powder is produced by coating the surface of a needle-like particle of hydrous iron oxide with at least one compound selected from aluminum compounds and zirconium compounds, then heat-treating the coated particle to convert it into hematite, thereafter coating the surface of the resulting hematite particle with an aluminum compound and then heating and reducing the particle.
Bibliography:Application Number: JP19940060065