Title: Method of producing ferromagnetic metal powder by gaseous reduction of silicon compound-coated raw material

Abstract: A method of producing ferromagnetic iron powder comprises the steps of dipping iron compound powder in a solution in which silicone oil is dissolved, removing solvent from the iron compound powder, reducing the iron compound powder in a reducing atmosphere at an elevated temperature and forming oxide layers on whole surfaces of the individual particles of the iron compound powder. Ferromagnetic iron powder produced according to this method has both a high coercive force and a high remanence ratio.

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Inventors: Amemiya, Masahiro (Hino, JA)
Asada, Seiichi (Hachioji, JA)

Application Number: 667549
Filing Date: 1976-03-17
Publication_date: 1977-08-23
Assignee: Hitachi, Ltd. (BOTH OF, JA); Hitachi Maxell, Ltd. (BOTH OF, JA)
Primary Class(es): 148/105 75/349, 252/62.55, 252/62.56, 252/62.58, 252/62.59
Other Classes:
US Patent Ref:

2651105	Sep, 1953	Neel	75/.
2744040	May, 1956	Altmann	148/105.
3598568	Aug, 1971	Klomp et al.	75/.
3607218	Sep, 1971	Akashi et al.	75/.
3627509	Dec, 1971	Van Der Geissen	75/.
3702270	Nov, 1972	Kawasaki et al.	75/.
3725036	Apr, 1973	Ehrreich et al.	75/.
3843349	Oct, 1974	Ehrreich et al.	75/.

Other Refs:
Primary Examiner: Satterfield, Walter R.
Assistant Examiner:
Attorney: Craig & Antonelli