Process for forming insulating layers on soft magnetic powder co

Details Process for forming insulating layers on soft magnetic powder co Process for forming insulating layers on soft magnetic powder co

1997-05-27

2000-04-25

Le, Hoa T.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

427220, 427384, B05D 700, B05D 302

Patent

active

060542195

ABSTRACT:
The present invention provides a soft magnetic powder composite core for an electric apparatus produced with soft magnetic particles having electric insulating layers on the surfaces thereof, wherein said electric insulating layers are formed by mixing said soft magnetic particles with an insulating layer-forming solution which comprises a phosphating solution and a rust inhibitor, which is an organic compound containing at least one of nitrogen or sulfur having a lone pair of electrons suppressing the formation of iron oxide and surfactant, and drying the treated soft magnetic particles at a predetermined temperature. The soft magnetic powder composite core is excellent in iron loss and magnetic flux density.

REFERENCES:
patent: 4776980 (1988-10-01), Ruffini

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