Insulation coating method of metal soft magnetic composite material and metal soft magnetic composite material

A technology of insulation coating and composite materials, which is applied in the direction of inorganic material magnetism, inductor/transformer/magnet manufacturing, electrical components, etc., and can solve the problem of low bonding force between coating layer and metal powder, degradation of SMC performance, and uneven coating and other problems, to achieve the effect of good insulation, moderate cross-linking density and good flexibility

Pending Publication Date: 2021-07-02
福建尚辉润德新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For better magnetic properties, SMC materials are required to be annealed at high temperature (usually above 700°C). The heat resistance of organic materials is not enough, and inorganic materials, such as silica, alumina, zinc oxide, etc., have higher heat resistance. However, there are still problems in the insulation coating, such as the low bonding force between the coating layer and the metal powder, uneven coating, and coating damage during compression molding, etc., which will lead to a decrease in the performance of SMC.

Method used

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  • Insulation coating method of metal soft magnetic composite material and metal soft magnetic composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix 0.1mol ethyl orthosilicate and 0.002mol methyltrimethoxysilane and add it to 200g absolute ethanol, add 0.085mol deionized water dropwise for the first time, stir for 25 minutes after the dropwise addition, add 80g acetone to remove oil Iron powder with an average particle size of 200 μm, stirred for 20 minutes, added dropwise 0.13mol deionized water for the second time, stirred for 15 minutes after the dropwise addition, and finally added dropwise 0.6mol deionized water, continued to stir for 40 minutes, filtered, absolute ethanol Wash, dry at 60°C, and then dry at 100°C to obtain insulation-coated powder.

Embodiment 2

[0031] Mix 0.1mol ethyl orthosilicate and 0.004mol methyltrimethoxysilane and add it to 220g absolute ethanol, add 0.09mol deionized water dropwise for the first time, stir for 30 minutes after the dropwise addition, add 180g acetone to remove oil Fe-Si-Al powder with an average particle size of 190 μm, stirred for 25 minutes, added dropwise 0.14mol deionized water for the second time, stirred for 15 minutes after the dropwise addition, and finally added dropwise 0.7mol deionized water, continued to stir for 60 minutes, filtered , washed with absolute ethanol, dried at 50° C., and then dried at 100° C. to obtain an insulation-coated powder.

Embodiment 3

[0033] Add 0.1mol tetraethyl orthosilicate to 200g absolute ethanol, add 0.11mol deionized water dropwise for the first time, stir for 12 minutes after the dropwise addition, add 120g iron powder with an average particle size of 200μm after degreasing with acetone, stir for 17 Minutes, add 0.15mol deionized water dropwise for the second time, stir for 15 minutes after the dropwise addition, finally add 0.85mol deionized water dropwise, continue stirring for 40 minutes, filter, wash with absolute ethanol, dry at 60°C, and then dry at 100°C, Obtain insulating coating powder.

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Abstract

The invention provides an insulation coating method of a metal soft magnetic composite material and the metal soft magnetic composite material. The insulation coating method of the metal soft magnetic composite material comprises the following steps: mixing tetraethoxysilane and trialkoxysilane, then adding the mixture into absolute ethyl alcohol, dropwise adding insufficient water for the first time, stirring for 2-30 minutes after dropwise adding, adding soft magnetic metal powder, stirring for 5-30 minutes, dropwise adding insufficient water for the second time, stirring for 2-20 minutes after dropwise adding, finally dropwise adding sufficient water, and continuously stirring for 5-60 minutes, filtering and drying to obtain the insulating coating powder. According to the preparation method, water is gradually added to promote gradual hydrolytic condensation of tetraethoxysilane and trialkoxysilane, the surface of the soft magnetic metal powder is coated with an insulating layer with the cross-linking density changing in a gradient mode, and after compression molding and annealing, the obtained metal soft magnetic composite material has the performance of insulation, low eddy current loss and the like.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic materials, and relates to an insulation coating method of metal soft magnetic composite materials and metal soft magnetic composite materials. Background technique [0002] The miniaturization of electrical equipment requires soft magnets to work at high frequencies, but the insulation of soft magnets is poor, resulting in high eddy current losses. Therefore, a soft magnetic composite material SMC with high insulation properties has been proposed. A method for preparing SMC is to use organic or inorganic materials to coat soft magnetic particles to form an insulating coating layer to increase the resistance of SMC. For better magnetic properties, SMC materials are required to be annealed at high temperature (usually above 700°C). The heat resistance of organic materials is not enough, and inorganic materials, such as silica, alumina, zinc oxide, etc., have higher heat resistance. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/24H01F41/02
CPCH01F1/24H01F41/0246
Inventor 张诺伟周辰虹朱林辉叶松寿陈秉辉
Owner 福建尚辉润德新材料科技有限公司
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