Method for producing a rare earth metal-iron-boron anisotropic s

Details Method for producing a rare earth metal-iron-boron anisotropic s Method for producing a rare earth metal-iron-boron anisotropic s

1987-11-25

1989-11-21

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148104, 419 12, 419 23, B22F 312

Patent

active

048819867

ABSTRACT:
In a method for producing a rare earth metal-iron-boron (R-Fe-B) anisotropic sintered magnet from R-Fe-B alloy ribbon-like flakes, each flake is formed with a thickness of about 20-500 .mu.m and contains R.sub.2 Fe.sub.14 B crystal grains dispersed in the flake with an average grain size of 10 .mu.m or less. The flakes are ground into a powder having an average particle size less than the thickness value of the flake. The powder is magnetically aligned and compacted into a compact body which is then sintered. Thus, the anisotropic sintered magnet is obtained with a high energy product and a high anti-corrosion property. The ribbon-like flakes are prepared by the continuous splat-quenching method. Alternatively, the flakes can be prepared by spraying the molten R-Fe-B alloy in a form of particles and cooling the particles on a cooling plate into flat small pieces.

REFERENCES:
Koon, N. C. et al., "Magnetic properties of amorphous and crystallized (Fe.sub.0.82 B.sub.0.18), 9 lb.sub.0.05 La.sub.0.05", Appln. Phys. Letter, vol. 39, No. 10, Nov. 15, 1981, pp. 840-842.
Mishra et al., "Microstructure of Melt-Spun Nd-Fe-B Magnequench Magnets", Journal of Magnetism and Magnetic Materials, 54-57, 1986, pp. 450-456.
Egami, "Low Field Magnetic Properties of Amorphous Alloys", Journal of the American Ceramic Society, vol. 60, No. 3-4, Mar., Apr. 1977, pp. 128-133.
Lee et al., "Processing Neodymium-Iron-Boron Mett-Spun Ribbons to Fully Dense Magnets"; IEEE Transactions on Magnetics, vol. Mag.-21, No. 5, Sep. 1985, pp. 1958-1963.
Croat et al., "High-energy product Nd-Fe-B permanent magnets", Applied Physics Letters, vol. 44, No. 1, Jan. 1984, pp. 148-149.
Patent Abstracts of Japan, vol. 11, No. 343, Nov. 10, 1987, JP-A-62 124 702 (Toshiba Corp.), 6-6-87.

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