Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1991-05-21
1992-11-17
Wyszomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148105, 419 29, H01F 4102
Patent
active
051640236
ABSTRACT:
There is disclosed a rare earth permanent magnet composed of a sintered product consisting of R and M where R represents at least one rare earth, and M represents Co or a combination of Co and at least one kind selected from the group consisting of Fe, Ni and Cu, the sintered product being of such a composition that a RM.sub.5 phase and a R.sub.2 M.sub.7 phase occur in the sintered product. The sintered product contains 63 to 65 wt. % of M, and the sintered product has a coercive force iHc of not less than 13,000 Oe. The permanent magnet can have a disk-shape, a ring-shape or a cylindrical shape. A method of heat treatment of the permanent magnet is also disclosed.
REFERENCES:
patent: 4746378 (1988-05-01), Wysiekierski et al.
patent: 4863511 (1989-09-01), Ishii et al.
patent: 4875946 (1989-10-01), Heh et al.
Patent Abstracts of Japan, vol. 13, No. 293 (C-615)(3641) Jul. 6, 1989 & JP-1 087 715 Fuji Electrochem Co.) Mar. 31, 1989.
IEEE Transactions on Magnetics, vol. 7, No. 3, Sep. 1971, New York US pp. 429-431; J. Schweizer et al: Coercivity of Heat-Treated Pr-Co Powder Compacts'.
Shimizu Michihisa
Tabaru Kazunori
Hitachi Metals Ltd.
Wyszomierski George
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