Plastic and nonmetallic article shaping or treating: processes – Reactive gas or vapor treatment of work
Patent
1982-01-05
1983-08-23
Pianalto, Bernard D.
Plastic and nonmetallic article shaping or treating: processes
Reactive gas or vapor treatment of work
264129, 423632, C04B 1514
Patent
active
044003374
ABSTRACT:
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.
REFERENCES:
patent: 4309459 (1982-01-01), Tokuoka
patent: 4311684 (1982-01-01), Umeki
Amemiya Masahiro
Hayashi Yukihiro
Hirai Shigeo
Kishimoto Mikio
Sueyoshi Toshinobu
Hitachi Maxell Ltd.
Pianalto Bernard D.
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