Carbon stabilized cobalt-rare earth magnetic materials

Details Carbon stabilized cobalt-rare earth magnetic materials Carbon stabilized cobalt-rare earth magnetic materials

1975-11-28

1977-08-23

Satterfield, Walter R.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

75152, 75243, 148103, 252 6255, 428928, H01F 102, C22C 2300, B22F 300

Patent

active

040438457

ABSTRACT:
A magnetic material comprising a substantially homogeneous mixture of rare earth, cobalt, and carbon elements, the percentage weight of the carbon component being in the range of about 1 percent and one-hundreth of one percent of the mixture; and a magnet made therefrom.
A method for stabilizing the coercivity of sintered rare earth-cobalt magnetic material and comprising the steps of mixing rare earth and cobalt constituent materials with a carbon constituent material having a percentage weight in the range of about 1 percent and one-hundredth of one percent of the mixture, grinding the mixture to a fine powder, and heating the powder particles to a suitable temperature for causing the more mobile carbon component to migrate to the surfaces of the respective powder particles and forming protective carbonaceous overlayers thereon which inhibit oxidation and evaporation of the samarium and cobalt components, thereby freeing more samarium for union with cobalt and permitting sintering thereof to be carried at a substantially lower temperature than conventional samarium-cobalt magnetic material having no carbon component.

REFERENCES:
patent: 3677947 (1972-07-01), Ray et al.
patent: 3867299 (1975-02-01), Rohatgi
patent: 3933536 (1976-01-01), Doser et al.

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