Rare earth-cobalt system permanent magnetic alloys and method of

Details Rare earth-cobalt system permanent magnetic alloys and method of Rare earth-cobalt system permanent magnetic alloys and method of

1980-11-24

1983-07-19

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 3157, 148101, 420435, H01F 102

Patent

active

RE0313173

ABSTRACT:
Permanent magnetic alloys comprising 11.5-12.5% rare earth components of which 6.3-12% is samarium and 0.5-6.2% is yttrium; 0.2-2.5% hafnium, [19.5-26.5%] 10.5-26.5% iron, 7-10.5% copper, and 52-70.7% cobalt, the ranges of the components being in atomic ratios. The alloys are prepared by obtaining 1-50 .mu.m. powders of the components, compacting the powder after mangetic field orientation sintering the compacted powders at 1160.degree.-1220.degree. for 1-10 hours, cooling the sintered body at a rate of at least 1.degree. C./second until the temperature is about 900.degree. C., and then annealing the body at 750.degree.-900.degree. C.

REFERENCES:
patent: 2810640 (1957-10-01), Bolkcom et al.
patent: 3560200 (1971-02-01), Nesbitt et al.
patent: 3695945 (1972-10-01), Benz
patent: 4082582 (1978-04-01), Menth et al.
patent: 4172717 (1979-10-01), Tokunaga et al.

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