Anisotropic neodymium-iron-boron powder with high coercivity and

Details Anisotropic neodymium-iron-boron powder with high coercivity and Anisotropic neodymium-iron-boron powder with high coercivity and

1992-01-13

1993-01-12

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 148105, H01F 102

Patent

active

051786923

ABSTRACT:
The magnetic coercivity of magnetically anisotropic powder containing the magnetic phase Nd.sub.2 Fe.sub.14 B, which already has appreciable magnetic coercivity, is enhanced by the method of this invention. The powder is produced by melt spinning an appropriate composition to form amorphous or extremely finely crystalline particles, hot working the particles to produce grains containing the Nd.sub.2 Fe.sub.14 B phase and having dimensions in the range of about 20 to about 500 nonometers, comminuting the worked body to a powder, and then appropriately heating the powder to a temperature of between about 550.degree. C. to about 675.degree. C. followed by a normal cooling in the protective atmosphere of the furnace. The heat-treated powder exhibits magnetic anisotropy and magnetic coercivity of at least about 5,000 Oersteds at room temperature.

REFERENCES:
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patent: 4952239 (1990-08-01), Tokunaga et al.
patent: 4983232 (1991-01-01), Endoh et al.
patent: 4994109 (1991-02-01), Willman et al.
patent: 5026438 (1991-06-01), Young et al.

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