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Manufacturing method of high-superposition low-loss metal magnetic powder core

A magnetic powder core, low-loss technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of poor DC superposition characteristics, high loss, and difficult to peel of metal magnetic powder core inductance, and improve the DC superposition characteristics, loss and other problems. Low, easy peeling effect

Active Publication Date: 2014-02-19
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem of poor DC superposition characteristics and high loss of metal magnetic powder core inductors in the prior art, and provides a method for preparing a metal magnetic powder core with high superposition and low loss. The process steps of the invention are simple, and the surface of the magnetic powder is passivated. The bonding strength between the film and the magnetic powder is high, and it is not easy to peel off. The insulating material on the surface of the magnetic powder is evenly coated, and it is not easy to crack and fall off. The metal magnetic powder core obtained by the preparation method of the present invention not only has good electromagnetic properties, but also has good current superposition characteristic

Method used

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  • Manufacturing method of high-superposition low-loss metal magnetic powder core

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Effect test

Embodiment 1

[0042] (1) Take water atomized sendust magnetic powder, the mass percentage content of each component in sendust magnetic powder is: Si 8.5%, Al 6.5%, the balance is Fe, and the magnetic powder particle size ratio is -150 mesh 8% , +150~-300 mesh 55%, the balance is +300 mesh.

[0043] (2) Add the sendust magnetic powder in step (1) into the acetone phosphoric acid solution, the mass ratio of phosphoric acid to acetone in the acetone phosphoric acid solution is 1:10, and the amount of the acetone phosphoric acid solution added is 10% of the mass of the sendust magnetic powder , continuously stirred for surface passivation reaction, the surface passivation temperature was 25°C, after the acetone solution was completely volatilized, the surface passivated sendust magnetic powder was baked at a constant temperature of 65°C for 2 hours to obtain insulating sendust magnetic powder.

[0044] (3) The iron-nickel magnetic powder is atomized with water. The mass percentage content of e...

Embodiment 2

[0053] (1) Take the gas-atomized sendust magnetic powder, the mass percentage of each component in the sendust magnetic powder is: Si 10%, Al 4.5%, the balance is Fe, and the particle size ratio of the magnetic powder is -150 mesh 12 %, +150~-300 mesh 45%, the balance is +300 mesh.

[0054] (2) Add the sendust magnetic powder in step (1) into the acetone phosphoric acid solution, the mass ratio of phosphoric acid to acetone in the acetone phosphoric acid solution is 1:7, and the amount of the acetone phosphoric acid solution added is 15% of the mass of the sendust magnetic powder , continuously stirred for surface passivation reaction, the surface passivation temperature was 30°C, after the acetone solution was completely volatilized, the surface passivated sendust magnetic powder was baked at a constant temperature of 55°C for 3 hours to obtain insulating sendust magnetic powder.

[0055] (3) Take the gas-atomized iron-nickel magnetic powder. The mass percentage of each compo...

Embodiment 3

[0064] (1) Take water atomized sendust magnetic powder, the mass percentage of each component in sendust magnetic powder is: Si 8.5~10%, Al 5%, the balance is Fe, and the particle size ratio of magnetic powder is -150 mesh 10%, +150~-300 mesh 50%, the balance is +300 mesh.

[0065] (2) Add the sendust magnetic powder in step (1) into the acetone phosphoric acid solution, the mass ratio of phosphoric acid to acetone in the acetone phosphoric acid solution is 1:8, and the amount of the acetone phosphoric acid solution added is 12% of the mass of the sendust magnetic powder , continuously stirred for surface passivation reaction, the surface passivation temperature is 27°C, after the acetone solution is completely volatilized, the sendust magnetic powder after surface passivation is baked at 60°C for 2.5 hours at a constant temperature to obtain insulating sendust magnetic powder .

[0066] (3) The iron-nickel magnetic powder is atomized by water, the mass percentage of each com...

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Abstract

The invention discloses a manufacturing method of a high-superposition low-loss metal magnetic powder core, aiming to solve the problem of poor direct-current superposition performance of an inductor using metal magnetic powder cores in the prior art. The manufacturing method includes performing surface passivation on Fe (iron)-Si (silicon)-Al (aluminum) magnetic powder by a phosphoric acid acetone solution; adopting a secondary insulation process, in which a chromic acid solution is used for surface film formation and coating liquor is used for surface coating, on Fi-Ni (nickel) magnetic power; mixing the Fe-Si-Al magnetic powder and the Fi-Ni magnetic powder and adding a demolding lubricant; obtaining the finished metal magnetic powder core after dry pressing, secondary annealing and surface painting. The manufacturing method is simple in process procedure; as binding strength between a passivation film on the surface of the magnetic powder and the magnetic powder is high, the passivation film is not easy to separate from the magnetic powder; insulating materials are evenly coated on the surface of the magnetic powder and are not easy to crack or shed; the metal magnetic powder core obtained by the manufacturing method has good current superposition performance, low loss and excellent mechanical property.

Description

technical field [0001] The invention relates to the technical field of metal soft magnetic materials, in particular to a method for preparing a metal magnetic powder core with high superposition and low loss. [0002] Background technique [0003] Magnetic powder core refers to the composite soft magnetic material formed by mixing and pressing ferromagnetic powder and insulating binder. At present, electronic components such as switching power converters, filters, and AC-DC converters made of metal magnetic powder cores are all developing in the direction of energy saving and high current. Therefore, metal magnetic powder cores are required to have low loss and high superposition characteristics. [0004] Due to its lower loss (100k, 100mT, Pcv=580mw / cm 3 ) and is widely used in the manufacture of various electronic components, but the DC superposition characteristics of its inductance are poor (as the superimposed DC magnetic field strength increases, its magnetic permeab...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F1/22B22F1/02
Inventor 张章明金旭东金天明包大新
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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