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

1990-06-06

1992-05-05

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 148105, 241 18, 241 24, 241 29, H01F 102

Patent

active

051103745

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 inot 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.
"The Hydrogen Decrepitation of an Nd.sub.15 Fe.sub.77 B.sub.8 Magnetic Alloy" J. of the Less Common Metals; 106 (Sep. 1985) L1-L4.
"Hydrogen Absorption and Desorption in Nd.sub.2 Fe.sub.14 B"; Appl. Phys. Lett. 48(6), Feb. 10, 1986, Cadogan et al.
"Novel Reading Media: Fe.sub.14 R.sub.2 B Particles"; IEE Trans. on Magnetics, vol. May-22, No. 5, Sep., 1986.

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