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US 5,350,628 AGranted
Magnetic sintered composite material
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKoichi Kugimiya, Yasuhiro Sugaya, Osamu Inoue, Ken Hirota, Mitsuo Satomi
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Abstract
A magnetic material is provided which includes a discrete phase including grains made of a first substance which comprises a magnetic metal; and a continuous phase including a thin coating film made of a second substance which comprises a dielectric or insulating substance. The thin coating film is formed on the surface of the grains and has a mean thickness smaller than the mean particle size of the grains. The grains are separated substantially from each other by the thin coating film.
Claims15
A magnetic sintered composite material comprising:
- a discrete phase including grains made of a first substance which comprises a magnetic metal or alloy thereof;
- and
- a continuous phase consisting essentially of a dielectric thin coating film of an oxide or nitride of a metal or alloy, said thin coating film being formed on the surface of said grains and having a mean thickness smaller than the mean particle size of said grains,
- wherein said grains are separated substantially from each other by said thin coating film, said magnetic sintered composite material having an electrical resistivity on the order of at least 10.sup.6 times that of said magnetic metal or alloy thereof, said first substance being an alloy selected from the group consisting of an iron-aluminum, an iron-silicon, an iron-nickel, an iron-nickel-molybdenum, and an iron-silicon-aluminum-cobalt.
1 more element
Dependencies are inferred from the claim text.