Hexagonal ba-ferrite sintered magnet, its making method, and pol

Details Hexagonal ba-ferrite sintered magnet, its making method, and pol Hexagonal ba-ferrite sintered magnet, its making method, and pol

1995-05-11

1997-03-04

Bonner, Melissa

Compositions

Magnetic

Iron-oxygen compound containing

252 6262, 252 6259, H01F 104

Patent

active

056076150

ABSTRACT:
In a method for preparing a magnet by pulverizing a calcined powder of hexagonal barium ferrite, compacting the thus pulverized ferrite magnet source particles in a magnetic field, and sintering the compact, a structure comprising barium ferrite as a primary phase and containing strontium and silicon as grain boundary components is obtained when a silicon component such as SiO.sub.2 and a strontium component such as SrCO.sub.3 are contained in the compact. This results in a hexagonal barium ferrite sintered magnet which has minimal anisotropy of shrinkage factor and minimal deformation during sintering, requires only simple or no post-polishing, and has improved sintered density and coercivity.

REFERENCES:
patent: 4457851 (1984-07-01), Tabaru et al.
J. Appl. Phys., vol. 44, No. 7, pp. 3300-3305, Jul. 1973, R. H. Arendt, "Liquid-Phase Sintering of Magnetically Isotropic and Anisotropic Compacts of BaFe.sub.12 O.sub.19 and SrFe.sub.12 O.sub.19 ".
Journal of the American Ceramic Society, vol. 56, No. 4, pp. 207-211, Apr. 1973, J. S. Reed, et al., "Characterization and Sintering Behavior of BA and SR Ferrites".
Ber. Dt. Keram. Ges., vol. 55, No. 6, pp. 301-304, 1978, Franciscus Kools, "Effect of Silica During Sintering of M-Type Ferrites".
"Effect of Additives on Magnetic Properties of Strontium Ferrite Magnets", vol. 3, pp. 29-35, Jan. 1977, Atsushi Hamamura.
"Influence of Addition of Some Oxides on the Magnetic Properties of the Strontium Ferrite Magnets", vol. 52, No. 4, pp. 151-159, 1977, Takeshi Anbo, et al.

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