Preparation method of iron-nickel magnetic powder core with magnetic permeability mu = 200

A magnetic powder core and magnetic permeability technology, which is applied in the direction of magnetic materials, magnetic objects, and inorganic materials, can solve the problems of low magnetic permeability and high cost, and achieve improved bulk density, low cost, and increased magnetic core strength. Effect

Active Publication Date: 2018-01-12
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

[0004] In order to overcome the problems of low magnetic permeability and high cost of traditional metal magnetic powder cores, the present invention provides a method for preparing iron-nickel magnetic powder cores with low loss, low cost, and a magnetic permeability μ=200 that can improve the strength of the magnetic core.

Method used

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  • Preparation method of iron-nickel magnetic powder core with magnetic permeability mu = 200

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Embodiment 1

[0030] A method for preparing an iron-nickel magnetic powder core with a permeability μ=200 includes the following steps:

[0031] (1) Primary insulation coating: Based on the total mass of the iron-nickel magnetic powder mother body, 0.01wt% calcium oxide is added to the iron-nickel magnetic powder for primary coating. The distribution of the elements in the iron-nickel magnetic powder is shown in Table 1. The particle size is -100 mesh, D50 is 10μm;

[0032] (2) Annealing: Put the iron-nickel magnetic powder after the primary insulation coating into the annealing furnace, and pass in nitrogen for protection, and anneal for 10h at 700℃;

[0033] (3) Secondary insulation coating: Add the annealed iron-nickel magnetic powder to the aqueous phosphoric acid solution and mix thoroughly. Based on the total mass of the iron-nickel magnetic powder precursor, the amount of phosphoric acid added is controlled at 0.001wt%; after heating to dryness, Add magnesium oxide and mix thoroughly, then...

Embodiment 2

[0038] A method for preparing an iron-nickel magnetic powder core with a permeability μ=200 includes the following steps:

[0039] (1) Primary insulation coating: Based on the total mass of the iron-nickel magnetic powder mother body, 1.0wt% of the mixture of kaolin and magnesium oxide (mass ratio 1:1) is added to the iron-nickel magnetic powder for primary coating, in which the iron-nickel magnetic powder The distribution of the elements in it is shown in Table 1. The particle size of the iron-nickel magnetic powder is -100 mesh, and the D50 is 70μm;

[0040] (2) Annealing: Put the iron-nickel magnetic powder after insulation coating into an annealing furnace, and pass nitrogen and hydrogen into it for protection. Anneal at 900℃ for 1 hour;

[0041] (3) Secondary insulation coating: Add the annealed iron-nickel magnetic powder to the acetone phosphoric acid solution and mix thoroughly. Based on the total mass of the iron-nickel magnetic powder precursor, the amount of phosphoric aci...

Embodiment 3

[0046] A method for preparing an iron-nickel magnetic powder core with a permeability μ=200 includes the following steps:

[0047] (1) Primary insulation coating: based on the total mass of the iron-nickel magnetic powder mother body, 0.5wt% of organic glue is added to the iron-nickel magnetic powder for primary coating. The distribution of the elements in the iron-nickel magnetic powder is shown in Table 1. The particle size is -100 mesh, D50 is 40μm;

[0048] (2) Annealing: Put the iron-nickel magnetic powder after the primary insulation coating into the annealing furnace, pass argon gas for protection, and anneal for 2h at 850℃;

[0049] (3) Secondary insulation coating: Add the annealed iron-nickel magnetic powder to the aqueous phosphoric acid solution and mix thoroughly. Based on the total mass of the iron-nickel magnetic powder precursor, the amount of phosphoric acid added is controlled at 0.05wt%; after heating to dryness, Then add the mixture of magnesium oxide, aluminum o...

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Abstract

The invention relates to the technical field of metal soft magnetic material manufacture, in particular to a preparation method of an iron-nickel magnetic powder core of the magnetic permeability mu =200. The preparation method comprises the steps of 1, once insulation coating; 2, annealing; 3, twice insulation cladding; 4, pressing molding; 5, heat treatment; 6, paint spraying. According to thepreparation method of the iron-nickel magnetic powder core, the iron-nickel magnetic powder is used and is lower in cost compared with the iron-nickel-molybdenum magnetic powder, the application market is more extensive; internal stress is reduced through high temperature annealing, the strength of an insulating layer is improved using a high temperature insulation agent through the combination oforganic and inorganic phases, the resistance of iron-nickel magnetic powder core is improved, so that the magnetic core inductance is reduced under a high frequency; the cladding method of organic and inorganic combination is used, the loose fit density of powder is improved, the formability of the powder is improved, the loss of a mould is reduced, the cost is reduced effectively, and the strength of the magnetic core is improved.

Description

Technical field [0001] The invention relates to the technical field of metal soft magnetic material manufacturing, in particular to a method for preparing an iron-nickel magnetic powder core with low loss, low cost, and capable of increasing the strength of the magnetic core with a permeability μ=200. Background technique [0002] Due to the high saturation magnetic flux density (Bs) of the metal soft magnetic powder core, it can meet the needs of device miniaturization, and the market demand is increasing. But its disadvantage is that the magnetic permeability is low. General iron powder cores, FeSiAl and FeSi magnetic powder cores have a permeability μ≤125u, and FeNi powder cores have a permeability μ≤160. Among the magnetic powder cores, FeNiMo powder cores have the highest permeability. , Magnetics can reach 550u, but FeNiMo magnetic powder core Bs is low, and the price is very high, the market share is small. FeNi metal magnetic powder core has high Bs (1.6T), the best stac...

Claims

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Application Information

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IPC IPC(8): H01F1/147H01F1/26B22F1/02C21D1/26C22C38/12C22C38/16C22C38/02C22C38/32
Inventor 姚骋熊伟童轶龙徐琛金天明
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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