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Ultrasonic-enhanced magnetic powder core compression molding method and compressed powder magnetic core

A press forming and ultrasonic technology, applied in the field of press forming, can solve the problems of reducing the local and even macro resistivity of the green compact, controlling the local density and resistivity of the green compact, and the promotion of mass production needs to be investigated, so as to improve the macro resistivity. , The effect of reducing pinning phenomenon and reducing loss

Pending Publication Date: 2021-12-31
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the partial discharge of magnetic powder particles will cause the breakdown of the insulating material, reduce the local and even macroscopic resistivity of the compact, and cause an increase in eddy current loss
SPS technology will also cause delamination and gradient phenomena of the green compact, which makes it difficult to solve the problems of local compactness and resistivity control of the green compact
In addition, the preparation cost of the SPS process is relatively high, and the promotion of mass production needs to be investigated

Method used

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  • Ultrasonic-enhanced magnetic powder core compression molding method and compressed powder magnetic core
  • Ultrasonic-enhanced magnetic powder core compression molding method and compressed powder magnetic core
  • Ultrasonic-enhanced magnetic powder core compression molding method and compressed powder magnetic core

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] In the present embodiment, the soft magnetic powder material used is Ni-Fe powder, and the insulating material is organic silicon resin, wherein, the mass ratio of organic silicon resin and soft magnetic powder is 1.5:100, and organic silicon resin is dissolved in acetone, After adding the magnetic material, stir until the acetone is completely volatilized, then take out the mixed powder, dry it and put it into an ultrasonic mold for pressing. Such as figure 2 As shown, the insulating material and soft magnetic powder are evenly distributed.

[0062] The pressure of the pneumatic system is set to 0.6MPa, the pressing time is 0.5s, the holding time is 5s, the ultrasonic frequency of the ultrasonic generator is 15kHz, the vibration amplitude of the ultrasonic amplifier is 80%, and the pneumatic system and the ultrasonic generator are started at the same time. The magnetic powder core is obtained after compression molding.

[0063] Using a vibrating sample magnetometer ...

Embodiment 2

[0068] The difference from Example 1 is that the soft magnetic powder material used is Fe-Si-B-C-Cr amorphous powder, wherein the mass ratio of the silicone resin to the amorphous soft magnetic powder is 1.5:100, and the silicone resin is dissolved in acetone , add the magnetic material and stir until the acetone volatilizes completely, then take out the mixed powder, put it into the ultrasonic mold for pressing after drying, the ultrasonic time is 0.5s, and the holding time is 5s; Figure 4 As shown, the insulating material and soft magnetic powder are evenly distributed.

[0069] Using a vibrating sample magnetometer to measure the magnetic properties of magnetic powder cores, such as Figure 5 As shown in (a), measured B s It is 0.92T.

[0070] The 2335A broadband energy analyzer of Hunan Lianzhong Company is used to measure the iron loss of the magnetic powder core, such as Figure 5 As shown in (c), the measured iron loss is W 0.1 / 100k Less than 620mW / cm 3 ;

[0071...

Embodiment 3

[0075] The difference from Example 1 is that the soft magnetic powder material used is Fe-Si-Al powder, the insulating substance is epoxy resin, the mass ratio of epoxy resin to soft magnetic powder is 2:100, and the epoxy resin is dissolved in acetone , add soft magnetic powder and stir until the acetone volatilizes completely, then take out the mixed powder, put it into an ultrasonic mold for pressing after drying, the ultrasonic time is 0.5s, and the holding time is 5s; Figure 6 As shown, the insulating material and soft magnetic powder are evenly distributed.

[0076] Using a vibrating sample magnetometer to measure the magnetic properties of magnetic powder cores, such as Figure 7 As shown in (a), measured B s 0.99T;

[0077] The 2335A broadband energy analyzer of Hunan Lianzhong Company is used to measure the iron loss of the magnetic powder core, such as Figure 7 As shown in (c), measure the iron loss W 0.1 / 100k Less than 659.4mW / cm 3 ;

[0078] The electrical ...

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Abstract

The invention discloses an ultrasonic-enhanced magnetic powder core compression molding method and a compressed powder magnetic core. The invention discloses an ultrasonic enhanced magnetic powder core compression molding method which comprises the following steps: placing soft magnetic powder (coated) in ultrasonic compression molding equipment, setting the ultrasonic frequency to be 15-60kHz and the vibration amplitude to be 70-90%, and simultaneously starting a pneumatic system to pressurize, wherein the pressure is 0.3-0.9 MPa, the compression time is 0.1-10s and the dwell time is 3-5s, and completing the compression molding of a magnetic powder core. The method / process has the advantages of being small in required pressure, short in completion time, high in powder forming density, simple and efficient. The invention further discloses the magnetic powder core prepared by the ultrasonic enhanced magnetic powder core compression molding method, the magnetic powder core has high saturation flux density, low iron loss and high initial magnetic conductivity, and the magnetic conductivity of the magnetic powder core shows good high-frequency stability.

Description

technical field [0001] The invention belongs to the field of compression molding, in particular to an ultrasonic-enhanced magnetic powder core compression molding method and a powder magnetic core. Background technique [0002] Magnetic powder core is a key part of electronic power components such as inductors, filters, and transformers under high-frequency conditions. The magnetic powder core is a composite material (pressed molded body) formed by mixing and pressing soft magnetic powder and insulating material. The pressing density, distribution and insulating film thickness of magnetic powder and insulating material directly affect the magnetic and electrical properties of the magnetic powder core. In order to suppress the eddy current loss that increases sharply with the increase of frequency, it is necessary to increase the resistivity of the magnetic powder core, and the coating of the magnetic powder by the insulating material is very important. [0003] In the proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/26H01F1/147H01F1/153
CPCH01F41/0246H01F1/26H01F1/14758H01F1/15308H01F1/15375
Inventor 张岩王军强黄妍
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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