Metal treatment – Compositions – Heat treating
Patent
1974-07-31
1976-08-31
Satterfield, Walter R.
Metal treatment
Compositions
Heat treating
75152, 148101, 148103, H01F 104
Patent
active
039779173
ABSTRACT:
Samarium cobalt magnetic materials for permanent magnets comprising, by atomic ratio relative to the samarium content, samarium of 1, cobalt of 4.0-5.2 and at least one addition selected from silicon up to 5.8 wt.% or 0.82 by atomic ratio to the samarium, germanium up to 8.5 wt.% or 0.57 by atomic ratio to the samarium and aluminum up to 4.75 wt.% or 0.82 by atomic ratio to the samarium, and having increased intrinsic coercive force and decreased irreversible magnetic induction loss with temperature. In the case wherein the total amount of the aforesaid addition or additions is limited, by atomic ratio to the samarium, to up to 0.25, the samarium cobalt magnetic materials may provide sintered permanent magnets having a reduced irreversible magnetic induction loss with temperature, without decreased residual magnetic flux density. When the total amount of the aforesaid addition is restricted, by atomic ratio to samarium, to up to 0.21, the resulting material may provide compacted permanent magnets having reduced irreversible magnetic induction loss with temperature, without any reduction of residual magnetic flux density.
REFERENCES:
patent: 2813789 (1957-11-01), Glaser
patent: 2829048 (1958-04-01), Cochardt et al.
patent: 3295963 (1967-01-01), Galvin
patent: 3424578 (1969-01-01), Strnat et al.
patent: 3821034 (1974-06-01), Wessendorp et al.
Barbara, B. et al.; Properties of Compounds Tb.sub.3 Al.sub.2 and D.sub.43 Al.sub.2, in Gr. Acad. Sc. Paris, 267, pp. 244-247 (July, 1968).
Wernick, J. et al.; Rare Earth Compounds with MgCu.sub.2 Structure, in Trans. Aime, Oct. 1968, pp. 866-868.
Fujimura Yasuo
Tada Masayuki
Satterfield Walter R.
Tohoku Metal Industries Limited
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