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 spr

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
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Example Embodiment

[0037] Example 1

[0038] Preparing an iron-based soft magnetic composite material, comprising:

[0039] 1, water atomized iron powder (purity> 99.0%, particle diameter 75-200μm, an apparent density of 3.0g / cm 3 ) Pretreatment mechanical milling, ball to powder ratio of 5: 1, mill speed of 450 rev / min, 8 min pretreatment time;

[0040] 2, the volume ratio of orthophosphoric acid 1:60 - 60 ℃ 60 minutes after drying the iron powder mixed with an ethanol solution of pretreatment, sieving; epoxy 1:20 - ethanol was uniformly coated with iron phosphate mixed, sieved again 60 deg.] C after it dried for 60 minutes to obtain an inorganic - organic composite coated powder;

[0041] 3, zinc stearate was added 0.5wt% of a lubricant mixed in the powder; 1000MPa using compression molding pressure;

[0042] 4, the samples were placed in an annealing furnace after pressing evacuated to 10 -3 After stable Pa charged with nitrogen to 0.04MPa, heating was started from room temperature to 250 deg...

Example Embodiment

[0044] Example 2

[0045] Preparing an iron-based soft magnetic composite material, comprising:

[0046] 1, water atomized iron powder (purity> 99.0%, particle diameter 75-200μm, an apparent density of 3.0g / cm 3 ) Pretreatment mechanical milling, ball to powder ratio of 3: 1, mill speed of about 500 rev / min pretreatment time was 5 minutes;

[0047] 2, orthophosphoric acid 1:80 - After the iron powder mixed with an ethanol solution of 80 deg.] C pre-dried for 40 minutes, sieved; the epoxy 1:15 - ethanol solution and phosphate coated iron powder were uniformly mixed, dried and sieved again obtain an inorganic 50 ℃ 60 minutes - organic composite coated powder;

[0048] 3, zinc stearate was added 0.5wt% of a lubricant mixed in the powder; compression molding pressure of 900MPa employed;

[0049] 4, the samples were placed in an annealing furnace after pressing evacuated to 10 -3 After stable Pa charged with nitrogen to 0.04MPa, heating was started from room temperature to 260 ℃, h...

Example Embodiment

[0050] Example 3

[0051] Preparing an iron-based soft magnetic composite material, comprising:

[0052] 1, taken reduced iron powder (purity> 99.0%, particle diameter 75-200μm, an apparent density of 4.5g / cm 3 ) Pretreatment mechanical milling, ball to powder ratio of 6: 1, a ball mill at 300 rpm / min, pretreatment time is 10 clock;

[0053] 2, orthophosphoric acid 1:70 - 50 deg.] C after drying the iron powder mixed with an ethanol solution of pretreatment for 60 minutes and sieved; epoxy 1:30 - ethanol solution and phosphate coated iron powder were uniformly mixed, dried and sieved again obtain an inorganic 80 ℃ 40 minutes - organic composite coated powder;

[0054] 3, zinc stearate was added 0.7wt% of a lubricant mixed in the powder; compression molding pressure of 800MPa employed;

[0055] 4, the samples were placed in an annealing furnace after pressing evacuated to 10 -3 After stable Pa charged with nitrogen to 0.02MPa, heating was started from room temperature to 270 de...

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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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