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Insulator-coated powder for magnetic member

A technology of insulating coating and magnetic components, which is applied in the direction of magnetic materials, magnetic objects, and the magnetism of inorganic materials, and can solve problems such as deterioration of absorption characteristics, reduction of magnetic permeability, and insufficient insulation resistance.

Active Publication Date: 2016-04-06
SANYO SPECIAL STEEL COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the frequency range of 770MHz to 50GHz, this radio wave absorber has insufficient insulation resistance, lowers magnetic permeability, and may deteriorate absorption characteristics.

Method used

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  • Insulator-coated powder for magnetic member
  • Insulator-coated powder for magnetic member
  • Insulator-coated powder for magnetic member

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A1～A36 and comparative example A1～A10

[0051] Production and evaluation of a magnetic member using the flat powder for a magnetic member whose coating film is composed of a polymer containing a substance containing titanium alkoxides was performed as follows.

[0052] [Production of magnetic sheet (magnetic member)]

[0053] Before the preparation of the magnetic sheet, the powders of the respective examples shown in Tables 1 and 2 below were produced. In the production of this powder, a powder (10 kg) composed of countless metal powders was prepared. This powder was processed with an attritor, and each metal powder was flattened. In addition, as the metal powder, Fe-3mass%Si powder and Fe-9.5mass%Si-5.5mass%Al powder were used.

[0054] Using a treatment solution containing titanium alkoxides, a film is formed on flattened metal powder to produce figure 1 Insulation coated flat powder shown. The types of titanium alkoxides used in this production are shown in Tables 1 and 2 below. The titanium alkoxide oligom...

Embodiment B1～B32 and comparative example B1～B4

[0084] Production and evaluation of a magnetic member using a flat powder for a magnetic member whose coating film contains a polymer containing titanium alkoxides and silicon alkoxides was performed as follows.

[0085] [Production of magnetic sheet (magnetic member)]

[0086] Before the preparation of the magnetic sheet, the powders of the respective examples shown in Tables 3 and 4 below were produced. In the production of this powder, a powder (10 kg) composed of countless metal powders was prepared. This powder was processed with an attritor, and each metal powder was flattened. In addition, as the metal powder, Fe-3mass%Si powder and Fe-9.5mass%Si-5.5mass%Al powder were used.

[0087] Using a treatment solution containing titanium alkoxides and silicon alkoxides, a film is formed on flattened metal powder to produce figure 1 Insulation coated flat powder shown. The types of titanium alkoxides and silicon alkoxides used in this production are shown in Tables 3 and 4 b...

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Abstract

Provided is an insulator-coated flat powder (2) that is for a magnetic member such as an electromagnetic wave absorber that is effective in blocking or absorbing electromagnetic waves in a frequency range of 1 MHz-50 GHz. The insulator-coated flat powder (2) is provided with flattened metal particles (4) and an insulating film (6) that is attached to the surface of the metal particles (4). The aspect ratio of the metal particles (4) is 10-300. The film (6) is a polymer that contains a titanium alkoxide. It is preferable that the ratio of the thickness of the film (6) to the thickness of the metal particles (4) in the powder (2) be 0.002-0.2. It is preferable that the titanium alkoxide in the powder (2) be an oligomer of a titanium alkoxide. It is preferable that the coverage rate of the metal particles (4) by the film (6) in the powder (2) be 20% or higher. It is preferable that the thickness of the film (6) in the powder (2) be 1 nm to 200 nm, and that the film (6) be an oxide of titanium.

Description

technical field [0001] The present invention relates to an insulating coating powder for magnetic members. Specifically, the present invention relates to an insulating-coated flat powder used for the production of a magnetic member used for shielding or absorbing electromagnetic waves in a frequency range of 1 MHz to 50 GHz. Background technique [0002] Mobile electronic devices represented by mobile phones, notebook-type personal computers, and tablet-type personal computers are popularized. Recently, along with miniaturization and high performance, parts in the circuit are easily affected by parts that generate noise, such as semiconductor elements. There are also reports that electromagnetic waves emitted by mobile electronic devices can have adverse effects on the body. [0003] In order to shield the semiconductor element in the circuit board and the electromagnetic wave emitted by the mobile electronic device, and prevent the influence of the electromagnetic wave, t...

Claims

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Application Information

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IPC IPC(8): H01F1/24H01F1/00H01F1/20H01F1/33H05K9/00
CPCH01F1/24H01F1/33
Inventor 山本隆久仮屋哲朗
Owner SANYO SPECIAL STEEL COMPANY
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