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AssigneeHitachi Maxell, Ltd.
InventorsYukihiro Hayashi, Toshinobu Sueyoshi, Shigeo Hirai, Mikio Kishimoto, Katsunori Tashita, Masahiro Amemiya
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A method for the production of uniform acicular metal magnetic particles comprising predominantly iron which have excellent magnetic characteristics and are useful as a recording element for a magnetic recording medium, said method comprising the steps of coating the surface of metal compound particles containing predominantly acicular iron oxyhydroxide or iron oxides with at least one member selected from the group consisting of an aluminum compound and a silicon compound, pelletizing the coated particles, and reducing the pellets with heating under reducing atmosphere, e.g. under hydrogen stream.
A method for the production of acicular metal magnetic particles comprising predominantly iron, which comprises the steps of coating the surface of metal compound particles containing predominantly acicular iron oxyhydroxide or iron oxides with at least one member selected from the group consisting of an aluminum compound and a silicon compound, pelletizing the coated particles to form pellets having an average size of from 0.5 to 30 mm, and reducing the thus produced pellets with heating under reducing atmosphere.
Dependencies are inferred from the claim text.