Powder for powder magnetic core, powder magnetic core, and methods for producing those products
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsDaisuke Okamoto, Daisuke Ichigozaki, Shin Tajima, Masaaki Tani
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Abstract
A powder for a powder magnetic core, a powder magnetic core, and methods of producing those products are provided, so that mechanical strength of a powder magnetic core can be enhanced by hydrosilylation reaction between vinylsilane and hydrosilane without degrading magnetic properties. The powder for a powder magnetic core is composed of magnetic particles 2 having a surface 21 coated with an insulating layer 3, wherein the insulating layer 3 includes a polymer resin insulating layer 33 comprising vinylsilane 4 and hydrosilane.
Claims8
A powder for a powder magnetic core comprising magnetic particles wherein a surface of each of the magnetic particles is coated with an insulating layer, wherein
- the insulating layer comprises, as a surface layer, a polymer resin insulating layer comprising a polymer including polymerized monomers of vinylsilane and hydrosilane,
- the polymer resin insulating layer is a silicone resin insulating layer,
- the silicone resin constituting the silicone resin insulating layer comprises, as side chains, a methyl group and a vinyl group for inducing hydrosilylation reaction with the hydrosilane at interfaces between the magnetic particles, and
- the silicone resin comprises the vinyl group at 2% to 10% in all the side chains and the methyl group at 38% to 77% in all the side chains.
A powder for a powder magnetic core comprising magnetic particles wherein a surface of each of the magnetic particles is coated with an insulating layer, wherein
- the insulating layer comprises, as a surface layer, a polymer resin insulating layer comprising a polymer including polymerized monomers of vinylsilane and hydrosilane,
- the polymer resin insulating layer is a silicone resin insulating layer,
- the silicone resin constituting the silicone resin insulating layer comprises, as side chains, a methyl group and a vinyl group for inducing hydrosilylation reaction with the hydrosilane, and
- the silicone resin comprises the vinyl group at 2% to 10% in all the side chains and the methyl group at 38% to 77% in all the side chains,
- the powder further comprises an oxide insulating layer as an insulating layer between each of the magnetic particles and the polymer resin insulating layer, and
- the oxide insulating layer comprises vinylsilane so as to induce hydrosilylation reaction between the oxide insulating layer and the polymer resin insulating layer.
Dependencies are inferred from the claim text.