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Magnetic powder surface gradient coating structure and coating method and soft magnetic composite

A coating structure, surface gradient technology, applied in the direction of inorganic material magnetism, metal material coating process, transportation and packaging, etc., can solve the problems of low resistivity, mismatched thermal expansion coefficient, etc. Controlled, thickness and particle size controllable effects

Active Publication Date: 2019-11-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the shortcomings of low material resistivity and mismatch of thermal expansion coefficients between cladding layers in the prior art

Method used

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  • Magnetic powder surface gradient coating structure and coating method and soft magnetic composite
  • Magnetic powder surface gradient coating structure and coating method and soft magnetic composite
  • Magnetic powder surface gradient coating structure and coating method and soft magnetic composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Gradient structure SiO on the surface of Fe powder 2 -(MnZn)Fe 2 o 4 Preparation of cladding layer cladding and soft magnetic composite materials:

[0051] Take 30g of ferromagnetic powder and wash it twice with alcohol. Mix the cleaned iron powder with a small amount of deionized water and absolute ethanol, add KH550, TEOS, and MnCl to the mixture 2 4H 2 O, ZnCl 2 and FeCl 3 ·6H 2 O, the added Mn 2 + :Zn 2+ :Fe 3+ The molar ratio is 1:1:4. Dilute to 200 mL with absolute ethanol and deionized water, and the total volume ratio of absolute ethanol and deionized water added is 95%:5%. In the reaction system, the mass percent of ferromagnetic powder, surface modifier, silicon source precursor, and soluble metal salt is: 1:0.02:0.2:0.05. Install a reflux condenser, heat and reflux in a water bath, adjust the reaction temperature to 50°C, cool with running water, add an appropriate amount of ammonia NH 4 OH, adjust the pH value of the solution to about 10.5, and...

Embodiment 2

[0054] Gradient structure coating on the surface of Fe powder and Fe / SiO 2 -ZrO 2 Preparation of soft magnetic composite materials:

[0055] Take 30g of iron powder and wash it twice with alcohol. Mix the cleaned ferromagnetic powder with a small amount of deionized water and absolute ethanol, and add KH560, TEOS, zirconium isopropoxide (C 12 h 28 o 4 Zr). Dilute to 200mL with absolute ethanol and deionized water, and the total volume ratio of absolute ethanol and deionized water added is 90%:10%. In the reaction system, iron powder, KH560, TEOS, C 12 h 28 o 4 The mass percentage of Zr is: 1:0.02:0.2:0.05. Install a reflux condenser, heat and reflux in a water bath, adjust the reaction temperature to 50°C, cool with running water, add an appropriate amount of ammonia NH 4 OH, adjust the pH value of the solution to about 10, and mechanically stir for 0.5h. Continue to add an appropriate amount of citric acid H 3 C 6 h 5 o 7 , adjust the pH value of the solution t...

Embodiment 3

[0058] Gradient structure coating on the surface of FeSiCr magnetic powder and FeSiCr / SiO 2 -Al 2 o 3 Preparation of soft magnetic composite materials:

[0059] Take 30g of FeSiCr powder and wash it twice with alcohol. Mix the cleaned powder with a small amount of deionized water and absolute ethanol, and add KH570, TEOS, zirconium isopropoxide (C 12 h 28 o 4 Zr). Dilute to 200 mL with absolute ethanol and deionized water, and the total volume ratio of absolute ethanol and deionized water added is 95%:5%. In the reaction system, iron powder, KH560, TEOS, C 12 h 28 o 4 The mass percentage of Zr is: 1:0.04:0.5:0.005. Install a reflux condenser, heat and reflux in a water bath, adjust the reaction temperature to 50°C, cool with running water, add an appropriate amount of ammonia NH 4 OH, adjust the pH value of the solution to about 11, and mechanically stir for 0.5h. Continue to add an appropriate amount of citric acid H 3 C 6 h 5 o 7 , adjust the pH value of the ...

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Abstract

The invention relates to a magnetic powder surface gradient coating structure and coating method and a soft magnetic composite. The gradient coating structure is prepared from a coating layer which isformed on the surface of ferromagnetic powder by silicon dioxide and other coated components, and the contents of the silicon dioxide and other coated components in the coating layer are gradiently distributed. The coating method comprises the step of depositing the silicon dioxide and other coated components on the surface of the ferromagnetic powder in one step by adopting a chemical coprecipitation method, wherein the pH value of the system is adjusted in the deposition process. The soft magnetic composite is obtained by sectionally annealing the ferromagnetic powder with the coating layeron the surface after being pressed and formed. The coefficient of thermal expansion of the coating layer prepared by using the method can be controlled, the prepared soft magnetic composite has the advantages of low eddy current loss, high magnetic conductivity, high resistivity and high saturation magnetization, and the defects of low resistivity, mismatching of the coefficient of thermal expansion between coating layers and the like of the material in the prior art are overcome; in order to solve the problems of the reduction of the medium-high frequency magnetic conductivity, high eddy current loss, serious heating and the like of an existing magnetic powder core, a good method is provided.

Description

technical field [0001] The invention discloses a magnetic powder surface gradient coating structure, a coating method and a soft magnetic composite material. In particular, it refers to a gradient coating structure containing multiple oxides on the surface of the magnetic powder, a coating method of the gradient coating structure and a soft magnetic composite material prepared by using the gradient coating structure magnetic powder. The invention belongs to the technical field of soft magnetic composite material preparation. Background technique [0002] Soft Magnetic Composites (Soft Magnetic Composites, SMCs), also known as metal magnetic powder core materials, is a new type of composite material prepared by coating the surface of ferromagnetic powder particles with an insulating medium. Effective frequency of use for magnetic materials. The volume resistivity of the soft magnetic composite material is increased by insulating coating on the surface of the soft magnetic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C23C18/12H01F1/33H01F41/00
CPCC23C18/1208H01F1/33H01F41/00B22F2207/01B22F1/16
Inventor 李丽娅高智陈秋丽葛毅成
Owner CENT SOUTH UNIV
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