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Soft magnetic alloy powder, wave absorbing sheet, preparation method thereof, electronic components and electronic equipment

A technology of electronic components and soft magnetic alloys, applied in electrical components, metal processing equipment, magnetic field/electric field shielding, etc., can solve the problems of low magnetic permeability of wave-absorbing plates, improve electromagnetic performance, improve conversion efficiency, and improve The effect of using the effect

Active Publication Date: 2021-06-08
常州威斯双联科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the magnetic permeability of the wave-absorbing sheets commonly used in the market is relatively low, between 120-180, and the ability can only be improved by increasing the thickness.

Method used

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  • Soft magnetic alloy powder, wave absorbing sheet, preparation method thereof, electronic components and electronic equipment
  • Soft magnetic alloy powder, wave absorbing sheet, preparation method thereof, electronic components and electronic equipment
  • Soft magnetic alloy powder, wave absorbing sheet, preparation method thereof, electronic components and electronic equipment

Examples

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Effect test

preparation example Construction

[0048] According to a first aspect of the present invention, a method for preparing a soft magnetic alloy powder is provided, comprising the following steps:

[0049] (a) Perform mechanical ball milling on the soft magnetic alloy powder to obtain flattened soft magnetic alloy powder; during the mechanical ball milling process, the ball: material: dispersant: solvent mass ratio is (8-12): (0.5-1.5): (0.02-0.08): (0.05-0.15);

[0050] (b) annealing the flattened soft magnetic alloy powder in a protective atmosphere at 700-900°C;

[0051] (c) Sieving the annealed flattened soft magnetic alloy powder to obtain flattened soft magnetic alloy powder with an aspect ratio of 100-200.

[0052] The type and size of the soft magnetic alloy powder are not limited, and the conventional selection of wave absorbing agents in the field can be referred to. Typical but non-limiting examples of the soft magnetic alloy powder are sendust soft magnetic alloy powder, iron-nickel soft magnetic allo...

Embodiment 1

[0109] A kind of preparation method of wave-absorbing film comprises the following steps:

[0110] (1) Take an appropriate amount of Fe-Si-Al soft magnetic alloy powder and add it to a planetary ball mill, mix the materials according to the mass ratio of ball: material: dispersant: solvent = 10:1:0.05:0.1, and the ball mill speed is 300r / min, The soft magnetic alloy powder is mechanically milled by means of forward and reverse alternating ball milling, alternately every 30 minutes, and the ball milling time is 240 minutes, to obtain a flattened sendust soft magnetic alloy powder with a diameter-thickness ratio of 80-150;

[0111] (2) The flat iron-silicon-alumina soft magnetic alloy powder is annealed in a nitrogen protective atmosphere when the temperature rises from room temperature to 800 ° C, and the annealing time is 6 hours;

[0112] (3) Add modified polyurethane binder to the flattened sendust soft magnetic alloy powder after annealing, and add dimethylformamide in the ...

Embodiment 2

[0119] Step (1) Other conditions remain unchanged during ball milling of the sendust soft magnetic alloy powder, and the ball milling time is changed to 360 minutes to obtain flat sendust powder with an diameter-thickness ratio of 100-200. The rest of the preparation steps are the same as in Example 1.

[0120] The wave-absorbing sheet thus prepared was tested with an Agilent E4991B impedance analyzer, and its magnetic permeability data are shown in Table 2.

[0121] Table 2

[0122] frequency 3MHz 13.56MHz μ’ 225.53 166.29 μ” 19.84 61.81

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Abstract

The invention discloses a soft magnetic alloy powder, a wave-absorbing sheet, a preparation method thereof, electronic components and electronic equipment, and relates to the technical field of electromagnetic protection. The preparation method of the high magnetic permeability magnetic powder and its wave-absorbing sheet includes: pressing common soft magnetic alloy powder into balls: material: dispersant: solvent mass ratio is (8-12):(0.5-1.5):(0.02- 0.08):(0.05‑0.15) is added into a ball mill for grinding, after ball milling, drying, annealing, sieving, and flattened high permeability soft magnetic alloy powder with an aspect ratio of 100‑200. It is further made into a wave-absorbing slurry, which is coated, dried, and calendered to make a wave-absorbing sheet. In the present invention, the flattened soft magnetic alloy powder reaches the optimal diameter-thickness ratio through ball milling, and at the same time adjusts the ratio of binder to powder composition and the forming process of hot pressing and then cold pressing to maximize the improvement of the wave-absorbing sheet Electromagnetic performance, to obtain a wave-absorbing sheet with high magnetic permeability.

Description

technical field [0001] The invention relates to the technical field of electromagnetic protection, in particular to a soft magnetic alloy powder, a wave-absorbing plate, a preparation method thereof, electronic components and electronic equipment. Background technique [0002] With the rapid improvement of the national economy and the gradual strengthening of our country's scientific and technological strength, the replacement of electronic equipment, especially civil electronic equipment, is getting faster and faster, and the product requirements are getting higher and higher. Electronic products with different functions are becoming more and more popular. crowd favorite. Electronic products at the present stage have developed towards the trend of miniaturization, high integration and high frequency, and the corresponding electromagnetic interference problems in high frequency range and narrow space are becoming more and more serious. Due to its flexibility, ultra-thin, wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/16H01F41/00H01F41/02B22F1/00B22F9/04H05K9/00
CPCH01F1/16H01F41/00H01F41/02B22F9/04H05K9/0081B22F2009/043B22F1/142
Inventor 方文
Owner 常州威斯双联科技有限公司
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