Hard magnetic core particles and a method of making same

Details Hard magnetic core particles and a method of making same Hard magnetic core particles and a method of making same

2005-09-21

2008-12-16

Goodrow, John L (Department: 1795)

Compositions

Magnetic

Iron-oxygen compound containing

C430S111310

Reexamination Certificate

active

07465409

ABSTRACT:
Hard magnetic core particles for use in the development of electrostatic latent images are produced by combining ferric oxide, a strontium oxide precursor, an oxygenated boron compound and a binder to form a mixture, wherein the strontium oxide precursor is preferably present in an amount that provides SrO in a molar amount that is in excess of a stoichiometric amount that provides a ratio of Fe2O3to SrO of 6/1. The mixture can be formed into green beads and the green beads can be fired to form the hard magnetic core particles.

REFERENCES:
patent: 3716630 (1973-02-01), Shirk
patent: 4623603 (1986-11-01), Iimura et al.
patent: 5332645 (1994-07-01), Saha et al.
patent: 2002/0025487 (2002-02-01), Lambert et al.
K. Masters, “Spray Drying”, 1972, pp. 314-317.
U.Enz, “Magnetism and Magnetic Materials: Historical Developments and Present Role in Industry and Technology”, 1982, Ferromagnetic Materials, vol. 3, pp. 502-209.

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