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Dust Core and Method for Producing Same

  • US 20080231409A1
  • Filed: 01/28/2005
  • Published: 09/25/2008
  • Est. Priority Date: 01/30/2004
  • Status: Active Grant
First Claim
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1. A powder core comprising:

  • a plurality of composite magnetic particles bonded to each other;

    wherein;

    each of said plurality of composite magnetic particles includes;

    a metal magnetic particle;

    an insulative lower layer coating surrounding a surface of said metal magnetic particle;

    an upper layer coating surrounding said lower layer coating and containing silicon; and

    dispersed particles containing a metal oxide compound and disposed in said upper layer coating and/or said lower layer coating; and

    a mean particle diameter R of said dispersed particles meets a condition 10 nm<

    R≦

    2 T, where T is an average thickness of a coating formed from said lower layer coating and said upper layer coating.

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