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Iron-based soft magnetic composite material and preparation method thereof

A soft magnetic composite material, iron-based technology, applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of reducing the magnetic permeability of stator magnets, environmental pollution of insulating paint, and increasing process flow, etc. The effect of improving magnet resistivity, protecting the environment, and low loss

Active Publication Date: 2021-09-28
山东精创磁电产业技术研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing process has the following problems: increase the process flow and increase the cost; the atomized insulating paint during the spraying process is easy to cause environmental pollution; and other special requirements, the surface is not allowed to spray the insulating paint layer

Method used

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  • Iron-based soft magnetic composite material and preparation method thereof
  • Iron-based soft magnetic composite material and preparation method thereof
  • Iron-based soft magnetic composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing an iron-based soft magnetic composite material, comprising:

[0039] 1. Take water and atomize iron powder (purity>99.0%, particle size 75-200μm, apparent density 3.0g / cm 3 ) to perform mechanical ball milling pretreatment, the ball-to-material ratio is 5:1, the ball mill rotating speed is 450 rpm, and the pretreatment time is 8 minutes;

[0040] 2. Mix the orthophosphoric acid-ethanol solution with a volume ratio of 1:60 and the pretreated iron powder, dry at 60°C for 60 minutes, and sieve; mix the 1:20 epoxy resin-ethanol solution with phosphoric acid-coated iron powder evenly Mix, dry again at 60°C for 60 minutes, and then sieve to obtain inorganic-organic composite coating powder;

[0041] 3. Add 0.5wt% zinc stearate lubricant to the powder and mix evenly; use 1000MPa pressure to press and form;

[0042] 4. Place the pressed sample in an annealing furnace and vacuumize to 10 -3 Pa filled with nitrogen to stabilize to 0.04MPa, start heating,...

Embodiment 2

[0045] A method for preparing an iron-based soft magnetic composite material, comprising:

[0046] 1. Take water and atomize iron powder (purity>99.0%, particle size 75-200μm, apparent density 3.0g / cm 3 ) to perform mechanical ball milling pretreatment, the ball-to-material ratio is 3:1, the ball mill rotating speed is 500 rpm, and the pretreatment time is 5 minutes;

[0047] 2. Mix 1:80 orthophosphoric acid-ethanol solution with pretreated iron powder, dry at 80°C for 40 minutes, and sieve; mix 1:15 epoxy resin-ethanol solution with phosphoric acid-coated iron powder evenly, Dry again at 50°C for 60 minutes and sieve to obtain inorganic-organic composite coating powder;

[0048] 3. Add 0.5wt% zinc stearate lubricant to the powder and mix evenly; use 900MPa pressure to press and form;

[0049] 4. Place the pressed sample in an annealing furnace and vacuumize to 10 -3 Pa filled with nitrogen to stabilize to 0.04MPa, start heating, from room temperature to 260 ° C, the heatin...

Embodiment 3

[0051] A method for preparing an iron-based soft magnetic composite material, comprising:

[0052] 1. Take reduced iron powder (purity>99.0%, particle size is 75-200μm, apparent density is 4.5g / cm 3 ) to perform mechanical ball milling pretreatment, the ball-to-material ratio is 6:1, the ball mill rotating speed is 300 rpm, and the pretreatment time is 10 minutes;

[0053] 2. Mix 1:70 orthophosphoric acid-ethanol solution with pretreated iron powder, dry at 50°C for 60 minutes, and sieve; mix 1:30 epoxy resin-ethanol solution with phosphoric acid-coated iron powder evenly, Dry again at 80°C for 40 minutes and sieve to obtain inorganic-organic composite coating powder;

[0054] 3. Add 0.7wt% zinc stearate lubricant to the powder and mix evenly; use 800MPa pressure to press and form;

[0055] 4. Place the pressed sample in an annealing furnace and vacuumize to 10 -3 Pa filled with nitrogen to stabilize to 0.02MPa, start heating, from room temperature to 270°C, the heating rat...

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Abstract

The invention relates to an iron-based soft magnetic composite material and a preparation method thereof, and belongs to the technical field of soft magnetic composite material preparation. The preparation method comprises the following steps: carrying out ball milling treatment on pure iron powder; coating the pure iron powder with an insulating layer; performing normal-temperature compression molding; placing the pressed sample in an annealing furnace, filling with nitrogen, stabilizing the pressure to 0.02-0.04 MPa, and heating the sample to 250-270 DEG C, wherein the heating rate is 15-18 DEG C / min; then reducing the heating rate to 3-5 DEG C / min, performing heating to 400-450 DEG C, and keeping the temperature; performing heating to 550-600 DEG C at a heating rate of 15-18 DEG C / min, preserving heat for 5-20 minutes, cooling the sample to 200 DEG C or below along with the furnace, and performing discharging. Through a multi-stage heat treatment method, organic matters such as a lubricant in the material are discharged to the greatest extent in the heat treatment process, and the defects such as pores and non-magnetic impurities are reduced; and the uniformity and integrity of an insulating coating layer on the surface of the powder are kept.

Description

technical field [0001] The invention relates to the technical field of soft magnetic composite material preparation, and specifically provides an iron-based soft magnetic composite material and a preparation method thereof. Background technique [0002] Soft Magnetic Composite (SMC) is made by coating the surface of soft magnetic powder with an insulating coating layer with high resistivity through compression molding and annealing heat treatment process. SMC materials have excellent properties such as high magnetic permeability, high saturation magnetization, low loss, and three-dimensional isotropy of magnetocaloric properties. They are widely used in high-efficiency motors, high-frequency sensors, reactors and other electronic components. In particular, pure iron-based SMC materials use atomized iron powder, reduced iron powder and other pure iron powder as raw materials, which are cheap and have great market promotion value. The preparation technology has become a resea...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/147B22F9/04B22F1/00B22F1/02B22F3/02B22F3/10B22F3/24
CPCH01F41/0266H01F1/147B22F9/04B22F3/02B22F3/101B22F3/24B22F2009/043B22F2003/248B22F2999/00B22F2201/02B22F2201/05
Inventor 梁丽萍孙蕾邵国庆吴玉明
Owner 山东精创磁电产业技术研究院有限公司
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