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Composite magnetic body and electromagnetic interference suppressing body using the same

A composite magnet, electromagnetic interference technology, applied in the fields of magnetic field/electric field shielding, electrical components, inorganic material magnetism, etc., can solve problems such as difficult to achieve self-extinguishing

Inactive Publication Date: 2004-10-13
TOKIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are some disadvantages in conventional composite magnets and EMI suppressors. When soft magnetic powder (especially soft magnetic alloy powder) and binder are mixed together, thermal conductivity is improved or due to the catalytic reaction of this soft magnetic powder. Raises flammability above the level of the binder, making it very difficult to achieve self-extinguishing as a primary condition for fire resistance

Method used

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  • Composite magnetic body and electromagnetic interference suppressing body using the same
  • Composite magnetic body and electromagnetic interference suppressing body using the same
  • Composite magnetic body and electromagnetic interference suppressing body using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The compounding composition of the composite magnet of the present invention is shown in Table 1 below as Inventive Example 1. According to this embodiment, the soft magnetic powder is obtained by using Fe-Si-Al, which is a magnetic alloy powder having a planar shape. A composition based on iron-silicon-aluminum-nickel or the like can also be used as this magnetic alloy powder.

[0023] Example 1 of the present invention employs a composition comprising 6-11 wt% silicon and 4-7 wt% aluminum, balanced with iron. This soft magnetic alloy powder has a 1.5m 2 / g specific surface area, 32 μm average particle size, and 3 or greater aspect ratio. 385 parts by weight of soft magnetic powder and 4 parts by weight of titanate-based coupling agent were mixed together with the help of a mixer or the like, and initial surface treatment was performed. During this process, the surface treatment agent may be diluted with a diluent or the like to obtain a uniform surface treatment. ...

Embodiment 2

[0038] Table 3 shows the mixing ingredients in Example 2. In this example, the same binder, soft magnetic powder, flame retardant (phosphate ester compound and magnesium hydroxide), brominated polymer flame retardant, and auxiliary flame retardant (tri oxides) are mixed together to obtain a composite magnet.

[0039] The primer (4 parts by weight) of the above-mentioned soft magnetic powder (385 parts by weight) and its SP (solubility parameter) value less than the SP value of the soft magnetic powder but greater than the SP value of chlorinated polyethylene (bonding agent) in a mixer or the like The soft magnetic powder is first mixed together with the help of a material to give the soft magnetic powder an initial primer treatment. In this treatment, the primer will be diluted with thinner or the like to obtain a uniform surface treatment. Inventive Example 2 uses the primer recommended by the couplant manufacturer, but dilute solutions such as polyvinyl chloride or polyvin...

Embodiment 3

[0047] The mixing ingredients of Example 3 are listed in Table 5. In this example, the same binder, coupling agent, flame retardant (phosphate ester compound and magnesium hydroxide), brominated polymer flame retardant, and antimony trioxide as in Example 1 were mixed in together to get a composite magnet. A nickel-iron alloy (magnetic alloy powder) having a planar shape is used as the soft magnetic powder. The magnetic alloy powder is an alloy powder containing nickel and iron. Copper, molybdenum, chromium, manganese, or the like may also be added to improve machinability or to achieve desirable EMI suppression.

[0048] mixed ingredients

Example 3

Comparative Example 2

Quantity (parts by weight)

Quantity (parts by weight)

Adhesive (halogen-containing adhesive)

Chlorinated polyethylene

100

100

Soft magnetic powder

nickel-iron alloy

Specific surface area 1.5(m 2 / g)

385

Specific...

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Abstract

A composite magnetic body 1, comprising a soft magnetic powder (2) and a binding agent (3), in which the specific surface area of the soft magnetic powder (2) is 0.1-3 m<2> / g. The surface state of the soft magnetic powder contained in the composite magnetic body is defined in terms of specific surface area, and self-extinguishing properties, i.e. fire resistance properties, are obtained. An electromagnetic interference suppressing body is obtained using this composite magnetic body.

Description

technical field [0001] The invention relates to a composite magnet for suppressing electromagnetic interference caused by redundant high-frequency electromagnetic wave interference, and also relates to an electromagnetic interference suppression body obtained by using it; specifically, it relates to a Fire protection technology of a composite magnet. Background technique [0002] Cellular phones, personal computers, and other kinds of electronic devices operating in high frequency bands, such as quasi-microwave bands, have become more common in recent years. In particular, smaller and lighter devices are urgently needed, while electromagnetic noise / interference poses serious problems. In view of this, composite magnets and electromagnetic interference suppressors have been commercialized as means to solve such high-frequency electromagnetic interference. [0003] However, conventional composite magnets and EMI suppressors have some disadvantages. When soft magnetic powder ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/26H01F1/28H01Q17/00H05K9/00
CPCH01F1/26H01F1/28H05K9/0083
Inventor 粟仓由夫
Owner TOKIN CORP