MAGNETIC METALLIC POWDER AND MAGNETIC RECORDING MEDIUM

PURPOSE:To obtain a recording medium having good corrosion resistance by providing a diffusion preventive layer between the nuclear part and surface layer part of magnetic metallic powder, thereby suppressing the internal diffusion of the metallic powder and improving satn. magnetization. CONSTITUTI...

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Bibliographic Details
Main Authors SUEYOSHI TOSHINOBU, ASADA SEIICHI
Format Patent
LanguageEnglish
Published 17.03.1988
Subjects
ADHESIVES
CHEMICAL PAINT OR INK REMOVERS
CHEMISTRY
COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS
CORRECTING FLUIDS
DYES
FILLING PASTES
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
INKS
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
PASTES OR SOLIDS FOR COLOURING OR PRINTING
PHYSICS
POLISHES
USE OF MATERIALS THEREFOR
WOODSTAINS
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Summary:PURPOSE:To obtain a recording medium having good corrosion resistance by providing a diffusion preventive layer between the nuclear part and surface layer part of magnetic metallic powder, thereby suppressing the internal diffusion of the metallic powder and improving satn. magnetization. CONSTITUTION:The surface layer contains Cr oxide and is provided with the diffusion preventive layer between said layer and the nuclear part. Elements such as oxide and hydroxide having >=1,000 deg.C m.p. and <=-0.7V oxidation- reduction potential is used for the diffusion preventive layer. Md/Mc is specified to 0.2-5wt% when the metal or metalloid quantity of the diffusion preventive layer is designated as Md and the metal quantity of the nuclear part as Mc. The metal forming the nuclear part consists of Fe or consists essentially of Fe.
Bibliography:Application Number: JP19860206451