Composite magnetic material
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsNobuya Matsutani, Yuji Mido, Hiroshi Fujii
Life of this patent
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Abstract
A composite magnetic body used for a choke coil, etc. is formed by compression molding of a mixture of magnetic alloy powder containing iron (Fe) and nickel (Ni) as the main component, an insulating material and a binder of an acrylic resin. In the composite magnetic body, high packing rate of the magnetic alloy powder and good insulation between the powder particles stand together, exhibiting a low core loss and a high magnetic permeability. The composite magnetic body can be formed in various core pieces of complex shapes.
Claims32
A composite magnetic body of a compressed compact comprising a mixture of a magnetic alloy powder containing iron and nickel as main components, a binder of a silicone resin for binding the magnetic alloy powder together, and a thermal diffusion inhibitor including a silane monomer.
A composite magnetic body of a compressed compact comprising a mixture of a magnetic alloy containing iron and nickel as main components, an insulating material and a binder of an acrylic resin for binding these together, said insulating material selected from the group consisting of oxide particles and organic silicon compound, wherein said organic silicon compound includes at least one of silicone resin and silicone oil.
A composite magnetic body of a compressed compact comprising a mixture of a magnetic iron powder or a magnetic alloy powder comprising 7.5% by weight or less (0% is not included) of silicon and remainder of iron, an insulating material and a binder of an acrylic resin for binding these together, said insulating material selected from the group consisting of oxide particles and organic silicon compound, wherein said organic silicon compound includes at least one of silicone resin and silicone oil.
A method for manufacturing a composite magnetic body comprising the steps of:
- mixing a magnetic alloy powder, an insulating material, and an acrylic resin into a mixture,
- granulating the mixture into a granulated powder,
- compressing the granulated powder into a magnetic core,
- heating the magnetic core at a temperature between 250 and 350° C., and
- heating the magnetic core at a temperature between 500 and 900° C. in a non-oxidizing atmosphere.
A composite magnetic body of a compressed compact comprising a mixture of a magnetic alloy powder containing iron and nickel as main components, and a binder of a silicone resin for binding the magnetic alloy powder together, wherein a packing rate of the magnetic alloy powder in the compressed compact falls within a range of 88-95% by volume.
A composite magnetic body of a compressed compact comprising a mixture of a magnetic alloy containing iron and nickel as main components, an insulating material and a binder of an acrylic resin for binding these together, wherein the compressed compact contains a fatty acid.
A composite magnetic body of a compressed compact comprising a mixture of a magnetic alloy containing iron and nickel as main components, an insulating material and a binder of an acrylic resin for binding these together, said insulating material including oxide particles.
A composite magnetic body of a compressed compact comprising a mixture of a magnetic alloy containing iron and nickel as main components, an insulating material and a binder of an acrylic resin for binding these together, wherein a packing rate of the magnetic alloy in the compressed compact falls within a range of 85-95% by volume.
A composite magnetic body of a compressed compact comprising a mixture of a magnetic iron powder or a magnetic alloy powder comprising 7.5% by weight or less (0% is not included) of silicon and remainder of iron, an insulating material and a binder of an acrylic resin for binding these together, wherein the compressed compact contains a fatty acid.
A composite magnetic body of a compressed compact comprising a mixture of a magnetic iron powder or a magnetic alloy powder comprising 7.5% by weight or less (0% is not included) of silicon aid remainder of iron, an insulating material and a binder of all acrylic resin for binding these together, wherein a packing rate of the magnetic powder in the compressed compact falls within a range of 85-95% by volume.
A composite magnetic body of a compressed compact comprising a mixture of a magnetic iron powder or a magnetic alloy powder comprising 7.5% by weight or less (0% is not included) of silicon and remainder of iron, an insulating material and a binder of an acrylic resin for binding these together, said insulating material including oxide particles.
Dependencies are inferred from the claim text.