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Magnetic sheet

A magnetic sheet and magnetic body technology, applied in the direction of magnetic objects, inorganic materials, magnets, etc., can solve problems such as complicated procedures, deterioration of magnetic properties, wear and tear of equipment or devices, and achieve the effect of high sheet surface resistance

Active Publication Date: 2019-08-16
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the prior art, magnetic properties may be deteriorated due to attachment of inorganic insulators on the surface of flat magnetic particles
In addition, in the prior art, the process of attaching the inorganic insulator to the surface of the flat magnetic particle is complicated, and since glass (amorphous) is used as the inorganic insulator, there is also a long time for the flattening process and equipment. or device wear and tear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0073] Alloy particles are prepared by water atomization method, and then the alloy particles are flattened by a media agitation mill, and heat treatment is further performed to obtain soft magnetic powder composed of flat magnetic particles.

[0074] The composition of flat magnetic particles is Fe-Si-Cr alloy magnetic body, expressed as Fe a1 Si b1 Cr c1 x d1 In the case of a1=70, b1=28, c1=2, d1=0.

[0075] When performing heat treatment, once the vacuum degree is lower than 0.1Pa, nitrogen gas is introduced as an inert gas to make the oxygen concentration 1×10 -8 ~0.01Pa, heat treatment (total stroke of heating, maintaining and cooling). By changing the heat treatment conditions and changing the thickness of the oxygen film, the flat magnetic particles of Examples and Comparative Examples shown in Table 1 were obtained. In addition, Comparative Example 1 was prepared as a comparative example in which no heat treatment was performed.

[0076] During heat treatment, se...

experiment example 2

[0090] When expressing the composition of flat magnetic particles as Fe a1 Si b1 Cr c1 x d1 In the case of , except that a1=72, b1=28, and c1=d1=0, each Example and Comparative Example were produced in the same manner as in Experimental Example 1, and the characteristics were evaluated. The results are shown in Table 2, Figure 7 and Figure 8 middle.

[0091] 【Table 2】

[0092]

[0093] According to Table 2, Figure 7 and Figure 8 , even when the flat magnetic particles do not contain Cr, the same tendency as the case of containing Cr appears.

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Abstract

The invention provides a magnetic sheet including flat magnetic substance particles. The flat magnetic substance particles are formed by Fe-Si-Cr alloy. Oxygen membranes exist in surfaces of the flat magnetic substance particles. The average thickness of the oxygen membranes is 3.5-6.0 nm when the thickness of the oxygen membranes is defined as a distance from a topmost surface to a part having a half of the maximum oxygen intensity measured by a auger electron spectroscopy.

Description

technical field [0001] The present invention relates to, for example, a magnetic sheet used as a magnetic shield. Background technique [0002] Magnetic shielding materials are used so that sources of magnetic fields such as magnetized objects do not affect other objects or circuits. From the viewpoint of shielding properties, it is preferable to use a metal plate with high magnetic permeability as the magnetic shielding material. However, the use of metal plates is significantly limited in terms of properties, cost, and the like. [0003] On the other hand, it is also known to use a magnetic sheet as a magnetic shielding material. The magnetic sheet can be formed, for example, by applying a paint obtained by dispersing a magnetic powder material in an organic binder to a place where magnetic shielding is required. In addition, the magnetic sheet can be formed in various places. For example, a magnetic sheet may be formed by applying the above-mentioned paint to a portio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F7/02H01F1/33
CPCH01F1/33H01F7/0205H01F7/021
Inventor 松野谦一郎本庄良浩内山良太松川笃人樱井康弘矢田芳雄伊藤守村瀬琢
Owner TDK CORPARATION