Spherical ferrite particles and ferrite resin composite for bond

Details Spherical ferrite particles and ferrite resin composite for bond Spherical ferrite particles and ferrite resin composite for bond

1991-10-11

1993-03-30

Johnson, Jerry

Compositions

Magnetic

With wax, bitumen, resin, or gum

252 6256, 252 6262, C04B 3504, C04B 3526, C04B 3564, H01F 100

Patent

active

051981386

ABSTRACT:
Disclosed herein are ferrite particles for a bonded magnetic core comprising crystal grains of 5 to 15 .mu.m in average diameter, having an average particle diameter of 20 to 150 .mu.m and a magnetic permeability of not less than 24, and consisting essentially of 47 to 58 mol % of Fe.sub.2 O.sub.3, 10 to 30 mol % of nickel oxide, manganese oxide, nickel-managanese oxide (calculated as NiO, MnO or NiO.MnO) and 15 to 40 mol % of zinc oxide (calculated as ZnO).

REFERENCES:
patent: 2579978 (1951-12-01), Snoek
patent: 3914181 (1975-10-01), Berg
patent: 4267065 (1981-05-01), Johnson, Jr. et al.
patent: 4268430 (1981-05-01), Suzuki et al.
patent: 4301020 (1981-11-01), Johnson, Jr. et al.
patent: 4336308 (1982-06-01), Yamada et al.
patent: 4352717 (1982-10-01), Watanabe
patent: 4372865 (1983-02-01), Yu et al.
patent: 4911855 (1990-03-01), Rasicci

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