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Low-loss soft magnetic powder core and preparation method thereof

A low-loss, magnetic powder core technology, applied in the manufacture of inductors/transformers/magnets, magnetic materials, magnetic objects, etc., can solve the problems of poor superposition performance, large eddy current loss, high loss, etc., and achieve low cost, simple preparation process, and low cost. Effect of High Frequency Power Loss

Active Publication Date: 2020-07-03
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the magnetic core has a high permeability, due to the coarse powder, the eddy current loss is large, and the loss is high; and because it is a broken powder, the core density is small, and the superposition performance is also poor.

Method used

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  • Low-loss soft magnetic powder core and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0033] A low-loss soft magnetic powder core, which is made of nanocrystalline powder, the D of the magnetic powder 90 = 45 μm, D 50 = 14 μm;

[0034] In the nanocrystalline powder, the content of Si is 13.5at%, the content of B is 9.0at%, the content of Nb is 3.0at%, the content of Cu is 1.0at%, the content of P is 0.01at%, and the content of C is 0.01 at%, the balance is iron.

[0035] A method for preparing a low-loss soft magnetic powder core, comprising the following steps:

[0036] a) Powder annealing: the above-mentioned magnetic powder is annealed in a protective atmosphere mixed with argon and hydrogen, the temperature is 550°C, and the heat treatment time is 2 hours;

[0037] b) Insulation coating: add 0.5wt% passivator phosphoric acid acetone solution of the magnetic powder weight to the magnetic powder after the above-mentioned treatment for passivation treatment, mix until dry, then add 0.08wt% kaolin by the magnetic powder weight therein The mixed aqueous disp...

Embodiment 2

[0042] A low-loss soft magnetic powder core, which is made of a mixed magnetic powder composed of gas-atomized FeSiAl powder and amorphous powder at a weight ratio of 8:2, and the D of the magnetic powder 90 =75μm, D 50 = 30 μm;

[0043] In the gas-atomized FeSiAl powder, the content of Si is 7.5wt.%, the content of Al is 3.5wt.%, and the balance is iron;

[0044] In the amorphous powder, the content of Si is 10 at%, the content of B is 15.0 at%, the content of P is 10.0 at%, the content of C is 5.0 at%, the content of Cr is 5.0 at%, and the balance is iron.

[0045] A method for preparing a low-loss soft magnetic powder core, comprising the following steps:

[0046] a) Powder annealing: heat-treat the above-mentioned magnetic powder under an argon protective atmosphere at a temperature of 850° C. and a heat-treatment time of 6 hours;

[0047] b) Insulation coating: Add 0.01% sodium hydrogen phosphate aqueous solution of the magnetic powder weight to the magnetic powder aft...

Embodiment 3

[0052] A low-loss soft magnetic powder core, which is made of mixed magnetic powder composed of gas-atomized FeSiAl powder and gas-atomized FeNiMo powder at a weight ratio of 5:5, and the D of the magnetic powder 90 = 45 μm, D 50 = 13 μm;

[0053] In the gas-atomized FeSiAl powder, the content of Si is 12.5wt.%, the content of Al is 8.5wt.%, and the balance is iron;

[0054] In the gas-atomized FeNiMo powder, the content of Fe is 15.0wt.%, the content of Mo is 2.0wt.%, and the balance is Ni.

[0055] A method for preparing a low-loss soft magnetic powder core, comprising the following steps:

[0056] a) Powder annealing: heat-treat the above-mentioned magnetic powder in a protective atmosphere mixed with nitrogen and hydrogen at a temperature of 700° C. for 2 hours;

[0057] b) Insulation coating: Add 0.3wt% aluminum dihydrogen phosphate aqueous solution of the magnetic powder weight to the magnetic powder after the above treatment for passivation treatment, mix until dry, ...

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Abstract

The invention belongs to the technical field of soft magnetic materials, and discloses a low-loss soft magnetic powder core, which is prepared from at least one kind of magnetic powder of gas atomization FeSiAl powder, gas atomization FeNiMo powder, amorphous powder and nanocrystalline powder. The invention further discloses a preparation method of the low-loss soft magnetic powder core. The preparation method comprises the steps of powder annealing, insulating coating, compression molding, heat treatment and the like. According to the invention, the preparation process is simple, existing equipment is used for production, and the cost is low; the prepared alloy magnetic powder core has the characteristics of high direct-current superposition performance, ultralow high-frequency power lossand the like; the magnetic conductivity range [mu]e of the prepared magnetic powder core is 18 to 125 (100kHz), at 25 DEG C, the power loss Pcv of the magnetic powder core is less than 200 kW / m<3> (100kHz / 100mT, SY8218), the power loss Pcv of the magnetic powder core is less than 800 mW / cm <3> (300 kHz, 100 mT, SY8218), and is the lowest loss value in the field of magnetic powder cores at present, and the low-loss soft magnetic powder core can be widely applied to filter inductors in a frequency range of 300 kHz-1 MHz.

Description

technical field [0001] The invention relates to the technical field of soft magnetic materials, in particular to a low-loss soft magnetic powder core and a preparation method thereof. Background technique [0002] Metal soft magnetic powder cores have the advantages of high saturation magnetic induction, high Curie temperature and high DC-bias, and are widely used in filter inductors for switching power supplies with a frequency of 10kHz-100kHz. Due to the low resistivity of the metal powder, the eddy current loss of the magnetic powder core is large at high frequency, so the soft ferrite core is generally used in the range of 100kHz-10MHz, and the disadvantage of the soft ferrite is that the Bs is low, only about 1 / 3 of the magnetic powder core. Under high current application, the superposition performance will drop sharply and lose its effect; and magnetic powder core has soft saturation characteristics, which can be applied to large current; therefore, reducing the high f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/147H01F1/153H01F41/02
CPCH01F1/14766H01F1/15333H01F1/15366H01F41/0266
Inventor 姚骋金志洪张丛史浙峰申建伟
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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