Dust core

Details Dust core Dust core

2007-06-26

2007-06-26

Moore, Margaret G. (Department: 1712)

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

C264S328170, C264S331110, C029S603070, C336S233000, C148S104000

Reexamination Certificate

active

11043397

ABSTRACT:
A dust core consists essentially of ferromagnetic powder; and an insulating binder, in which the ferromagnetic powder is dispersed; wherein the insulating binder is a silicone resin comprising a trifunctional alkyl-phenyl silicone resin and optionally containing an inorganic insulator such as an inorganic oxide, carbide or nitride. Preferably the alkyl-phenyl silicone resin is a methyl-phenyl silicone resin and comprises about 20 to 70 mol % of trifunctional groups. The dust core can be produced by pressure-molding a ferromagnetic powder, a lubricant and a trifunctional alkyl-phenyl silicone resin binder and heat treating the molded core at a temperature in the range of about 300 to about 800° C. for a time period in the range of about 20 minutes to about 2 hours in a non-oxidizing atmosphere. The dust core has high magnetic permeability representing the direct current superimposition characteristics, has reduced core loss and has increased mechanical strength.

REFERENCES:
patent: 4601765 (1986-07-01), Soileau et al.
patent: 6102980 (2000-08-01), Endo et al.
patent: 6149704 (2000-11-01), Moro et al.
patent: 6527823 (2003-03-01), Moro
patent: 6904388 (2005-06-01), Grieb et al.
patent: 869 517 (1998-10-01), None

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