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Method and product for improving magnetic conductivity of iron-based magnetic powder core based on magnetic exchange length

A magnetic powder core and magnetic exchange technology, which is applied in the fields of inorganic material magnetism, inductance/transformer/magnet manufacturing, electrical components, etc. Problems such as increased loss

Pending Publication Date: 2021-07-06
ANHUI UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of using high-permeability-based magnetic powder composite or high-permeability-based magnetic powder core filling can effectively improve the magnetic permeability of a single iron-based magnetic powder core product. However, the losses of different iron-based soft magnetic powders or magnetic powder cores are different and The stability of magnetic permeability with frequency is poor. Although the magnetic permeability has increased, the stability of magnetic permeability with frequency changes has decreased, and the magnetic loss has also increased, so it is impossible to comprehensively improve the magnetic properties of iron-based magnetic powder cores. Purpose

Method used

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  • Method and product for improving magnetic conductivity of iron-based magnetic powder core based on magnetic exchange length
  • Method and product for improving magnetic conductivity of iron-based magnetic powder core based on magnetic exchange length
  • Method and product for improving magnetic conductivity of iron-based magnetic powder core based on magnetic exchange length

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Effect test

Embodiment 1

[0056] Such as figure 1 As shown, a kind of iron-based magnetic powder core product of the present embodiment, its preparation method comprises the steps:

[0057] (1) Inorganic coating: use the sol-gel method or fluidized vapor deposition method to coat the silicon dioxide insulating layer on the surface of the iron-silicon powder. The layer thickness is 30nm, and the iron-based / silicon dioxide soft magnetic composite powder is obtained.

[0058] (2) Binder configuration: Take an appropriate amount of nano-scale iron-silicon powder and add it to the silicone resin binder. After mixing evenly, perform ultrasonic dispersion. The time of ultrasonic dispersion is 30 minutes, and the frequency is 35kHz. It is 3nm, and the added mass of nano-scale iron-silicon powder and binder is determined according to the formula of the present invention. In this embodiment, the distance l between the nano-scale iron-silicon powders is set to 32, and finally a binder with evenly dispersed nano...

Embodiment 2

[0063] Such as figure 1 As shown, a kind of iron-based magnetic powder core product of the present embodiment, its preparation method comprises the steps:

[0064] (1) Inorganic coating: use the sol-gel method or fluidized vapor deposition method to coat the silicon dioxide insulating layer on the surface of the gas-atomized iron powder, wherein the particle size of the gas-atomized iron powder is controlled to be 30-150 μm, The thickness of the silicon dioxide insulating layer is 35nm, and the iron-based / silicon dioxide soft magnetic composite powder is obtained.

[0065] (2) Binder configuration: Take an appropriate amount of nano-scale aerosolized iron powder and add it to the silicone resin binder. The particle size is controlled to be 4nm, and the added mass of nano-scale gas atomized iron powder and binder is determined according to the formula of the present invention. In this embodiment, the distance l between the nanoscale gas-atomized iron powders is set to 30, and...

Embodiment 3

[0070] Such as figure 1 As shown, a kind of iron-based magnetic powder core product of the present embodiment, its preparation method comprises the steps:

[0071] (1) Inorganic coating: the silicon dioxide insulating layer is coated on the surface of sendust powder by sol-gel method or fluidized vapor deposition method, wherein the particle size of sendust powder is controlled to be 30-150 μm, and the silicon dioxide The thickness of the silicon insulating layer is 40nm, and the iron-based / silicon dioxide soft magnetic composite powder is obtained.

[0072] (2) Binder configuration: Take an appropriate amount of nano-scale sendust powder and add it to the epoxy resin binder, mix it evenly, and perform ultrasonic dispersion. The time of ultrasonic dispersion is 20min, and the frequency is 40kHz. The control is 1nm, and the added mass of nano-scale sendust powder and binder is determined according to the formula of the present invention. In this embodiment, the spacing l betw...

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Abstract

The invention discloses a method and product for improving the magnetic conductivity of an iron-based magnetic powder core based on the magnetic exchange length, and belongs to the technical field of soft magnetic materials and powder metallurgy. The preparation method comprises the following steps: firstly, coating the surface of iron-based soft magnetic powder with a silicon dioxide insulating layer to obtain iron-based / silicon dioxide soft magnetic composite powder; then adding the nanoscale iron-based soft magnetic powder into the binder, uniformly mixing and ultrasonically dispersing to obtain the binder with uniformly dispersed nanoscale iron-based soft magnetic powder; and finally, uniformly mixing the iron-based / silicon dioxide soft magnetic composite powder, a binder with uniformly dispersed nano-scale iron-based soft magnetic powder and a release agent, performing compression molding, and performing heat treatment to obtain a product of which the distance between magnetic phases in the iron-based magnetic powder core is controlled within a magnetic exchange length (30-75nm), so that the magnetic induction intensity and the magnetic conductivity of the product are effectively improved. The method is simple in process, easy to operate, low in production cost and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic materials and powder metallurgy, and more specifically relates to a method and a product for improving the magnetic permeability of an iron-based magnetic powder core based on the magnetic exchange length. Background technique [0002] Combining iron-based soft magnetic metal particles with insulating binders and then pressing them into iron-based magnetic powder cores is a key method for making inductive devices, especially inductive devices in high-frequency, high-current and high-power circuits. With the increase of the function of the inductance device and the improvement of technology, this puts forward higher requirements on the performance of the iron-based magnetic powder core. Iron-based magnetic powder cores must meet the requirements of high frequency, miniaturization, patching, high magnetic permeability, low loss and anti-electromagnetic interference. Among them, how to further...

Claims

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Application Information

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IPC IPC(8): H01F1/24H01F41/02
CPCH01F1/24H01F41/0246H01F41/02
Inventor 吴朝阳贾吉祥孔辉高子涵彭春霖眭梦静杨光
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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