Rare earth-iron-boron magnet powder and process of producing sam

Details Rare earth-iron-boron magnet powder and process of producing sam Rare earth-iron-boron magnet powder and process of producing sam

1988-08-19

1991-01-01

Sheehan, John P.

Metal treatment

Stock

Magnetic

420 83, 420121, H01F 104

Patent

active

049815326

ABSTRACT:
In a rare earth-iron-boron alloy magnet powder, each individual particle includes a recrystallized grain structure containing a R.sub.2 Fe.sub.14 B intermetallic compound phase as a principal phase thereof, wherein R represents a rare earth element. The intermetallic compound phase are formed of recrystallized grains of a tetragonal crystal structure having an average crystal grain size of 0.05 .mu.m to 50 .mu.m. For producing the above magnet powder, a rear earth-iron-boron alloy material is first prepared. Then, hydrogen is occluded into the alloy material by holding the material at a temperature of 500.degree. C. to 1,000.degree. C. either in an atmosphere of hydrogen gas or in an atmosphere of hydrogen and inert gases. Subsequently, the alloy material is subjected to dehydrogenation at a temperature of 500.degree. C. to 1,000.degree. C. until the pressure of hydrogen in the atmosphere is decreased to no greater than 1.times.10.sup.-1 torr, and is subjected to cooling.

REFERENCES:
patent: 4558077 (1985-12-01), Gray
patent: 4770702 (1988-09-01), Ishigaki et al.
patent: 4770723 (1988-09-01), Sagawa et al.
"They Hydrogen Decrepitation of an Nd.sub.15 Fe.sub.77 B.sub.8 Magnetic Alloy"; Journal of the Less-Common Metals; 106 91985), L1-L4.
"Hydrogen Absorption and Desorption in Nd.sub.2 Fe.sub.14 B"; Appl. Phys. lett. 48(6), 10 Feb. 1986.
"Novel Reading Media: Fe.sub.14 R.sub.2 B Particles"; IEE Transactions on Magnetics, vol. Mag-22, No. 5, Sep. 1986.

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