Soft magnetic composite organically/inorganically compound insulation coating powdered iron and preparation method thereof

A technology of soft magnetic composite materials and inorganic insulation, applied in the fields of magnetism of inorganic materials, manufacturing of inductors/transformers/magnets, electrical components, etc., can solve problems such as brittleness of the insulating film, complicated preparation process, uneven coating, etc., to achieve Excellent coating effect and mechanical properties, simple process and low cost

Inactive Publication Date: 2008-07-23
ZHEJIANG KEDA MAGNETOELECTRICITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to solve the above-mentioned technical problems that the insulating film is easy to be brittle, the coating is uneven, the preparation process is complicated, and the s

Method used

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  • Soft magnetic composite organically/inorganically compound insulation coating powdered iron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix and stir 13ml of water, 40ml of tetraethyl orthosilicate, and 21ml of ethanol for 30 minutes. During the stirring process, add a few drops of hydrochloric acid (catalyst) to obtain a transparent liquid silica sol, and add epoxy resin (5g of epoxy resin dissolved in 50ml of ethanol) resin solution), continue stirring to form a compatible transparent insulating sol, add 5000g iron powder to the insulating sol, then age at room temperature, after the sol gels, organic / inorganic insulating coated iron powder is obtained soft magnetic composite materials. The scanning electron micrographs of the coated iron powder at different magnifications are shown in Figure 1-3. From Figures 1-3, it can be seen that the surface of iron powder coated with silica and epoxy resin composite prepared by sol-gel process is smooth and uniform without cracks.

Embodiment 2

[0032]Mix 10ml of water, 10ml of tetraethyl orthosilicate, 20ml of methyltrimethylsilane, and 20ml of ethanol and mix and stir for 30 minutes. During the stirring process, add a few drops of hydrochloric acid (catalyst) to obtain a transparent liquid silica sol, add phenolic resin (5g phenolic resin solution dissolved in 50ml ethanol), continue to stir to form a compatible transparent insulating sol, add 5000g iron powder to the insulating sol, and then put it in an oven set at 60°C for aging, the sol After gelation, a soft magnetic composite material of organic / inorganic insulating coated iron powder is obtained.

Embodiment 3

[0034] Mix 15ml of water, 35ml of tetraethyl orthosilicate, and 25ml of ethanol and stir for 30 minutes. During the stirring process, add a few drops of ammonia water (catalyst) to obtain a transparent liquid silica sol. Add 3g of methyl methacrylate and drop a few drops of even Nitrogen initiator, continue to stir to form a compatible transparent insulating sol, add 5000g iron powder to the insulating sol, and then age at room temperature, after the sol gels, an organic / inorganic insulating coated iron powder is obtained soft magnetic composite materials.

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Abstract

The invention relates to a soft magnetic composite material, in particular to a soft magnetic composite material of organic/inorganic insulator-coated ferrous powder and a process for preparation by sol-gel. In the soft magnetic composite material of organic/inorganic insulated-coated ferrous powder, the soft magnetic composite material comprises insulation material coated ferrous powder, wherein the quantity of the insulation material is 0.05%-1.5% of quality of the coated ferrous powder according to percentage by weight, the insulation material uniformly and dispersedly compounded by materials containing sol and polymer of silicon dioxide, and the polymer is 5%-30% of the insulation material in accordance with percentage by weight. The invention has the advantages that 1) the sol of silicon dioxide is generated in-situ of the solution and coated on the surface of the ferrous powder, 2) by employing the organic/inorganic insulator to coat the ferrous powder, combining the advantages of organic and inorganic coatings, the coating effect and mechanical property of insulated layers is excellent, and 3) the technique is simple and cost is low.

Description

technical field [0001] The invention relates to a soft magnetic composite material, in particular to a soft magnetic composite material with organic / inorganic insulation coated iron powder and its preparation method through sol-gel. Background technique [0002] Soft magnetic composites (SMC) are composed of soft magnetic powder materials (such as iron powder) and a small part of the surface insulating medium, which can be pressed into parts with complex shapes by powder metallurgy technology in one step, and has good isotropy Magnetic properties. The physical properties of the material determine that it is very suitable as the core material of the motor, and has brought revolutionary changes to the design of the motor. Existing studies have shown that the properties of magnetic powder cores are closely related to their insulating materials and their additions. It largely determines its density, magnetic flux, electrical resistance, eddy current loss and mechanical strengt...

Claims

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Application Information

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IPC IPC(8): H01F1/22H01F1/24H01F1/26B22F1/02H01F41/00
Inventor 柯昕陈建军
Owner ZHEJIANG KEDA MAGNETOELECTRICITY
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