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

AI Technical Summary

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

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0055] Example 1

[0056] Such as figure 1 As shown, an iron-based magnetic powder core product of the present embodiment includes the following steps:

[0057] (1) Inorganic coating: The silicon dioxide insulating layer is covered with a sol-gel method or a fluid gas deposition method, wherein the particle size of the ferrosilicon powder is controlled to 30 to 150 μm, silica insulation. The layer thickness was 30 nm, and the iron-based / silica soft magnetic composite powder was obtained.

[0058] (2) Adhesive configuration: Take a proper amount of nanoscale ferroelectric powder to add a silicone resin binder, mix uniform, ultrasonic dispersion, ultrasonic dispersion of 30 min, frequency of 35 kHz, wherein the nano-level particle size control It is determined according to the formula of the present invention for 3 nm, nano-scale ferrosilicon powder and binder. In this embodiment, the spacing L between the nano-grade ferroelectric silicon powder is taken 32, and finally obtains a ...

Example Embodiment

[0062] Example 2

[0063] Such as figure 1 As shown, an iron-based magnetic powder core product of the present embodiment includes the following steps:

[0064] (1) Inorganic coating: The silica insulating layer is covered with a sol-gel method or a fluidized gas deposition method in aerosolized iron powder, wherein the particle size of aerosolized iron powder is 30 to 150 μm. The silica insulating layer has a thickness of 35 nm, and a ferromag oxide is obtained from ferromagaroxide.

[0065] (2) Adhesive configuration: Take a proper amount of nano aerosolic iron powder to add a silicone resin binder, mix uniform, ultrasonic dispersion, and ultrasonic dispersion of 60 min, with a frequency of 25 kHz, wherein nano-level The particle size is controlled to 4 nm, and the nano aerosolified iron powder and the adhesive addition quality are determined in accordance with the formula of the present invention. In this embodiment, the spacing L between the nano aerosolized iron powder is tak...

Example Embodiment

[0069] Example 3

[0070] Such as figure 1 As shown, an iron-based magnetic powder core product of the present embodiment includes the following steps:

[0071] (1) Inorganic coating: The silica insulating layer is covered with a sol-gel method or a fluidized gas deposition method, wherein the particle size control of the ferrous silicon aluminum powder is 30 to 150 μm, dioxide. The silicon insulating layer has a thickness of 40 nm to obtain an iron-based / silica soft magnetic composite powder.

[0072] (2) Adhesive configuration: Take a proper amount of nano-grade ferroelectric silica powder to add epoxy resin binder, mix uniform, ultrasonic dispersion, and ultrasonic dispersion of 20 min, frequency is 40 kHz, wherein the particle size of the nano-stage The control of 1 nm, nano-grade ferroelectric silica powder and binder additives are determined in accordance with the formula of the present invention. In the present embodiment, the spacing L between the nano-grade ferroelectri...

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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
CPCH01F1/24H01F41/02H01F41/0246
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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