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(11) | EP 1 246 209 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Ferromagnetic-metal-based powder, powder core using the same, and manufacturing method for ferromagnetic-metal-based powder |
| (57) An iron-based powder including a heat-resistant insulate coating and a powder core
are suggested. A paint containing silicone resin and pigment is added to a raw material
powder primarily containing a ferromagnetic metal, especially, iron, agitation and
mixing are performed and, thereafter, a drying treatment is performed so as to form
a coating containing silicone resin and pigment on the surface of the iron-based powder.
The ratio of the silicone resin content to the pigment content in the coating is preferably
0.01 or more, but less than 4.0 on a mass basis. The pigment is preferably at least
one selected from the group consisting of metal oxides, metal nitrides, metal carbides,
minerals, and glass. The paint may be sprayed to the iron-based powder in a fluidized
state. A coating containing at least one of Si compounds, Ti compounds, Zr compounds,
P compounds, and Cr compounds may be formed as a lower layer of the aforementioned
coating. |