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A kind of preparation method of soft magnetic composite material with high saturation magnetic flux density and high magnetic permeability

A soft magnetic composite material and magnetic flux density technology, applied in the field of magnetic materials, can solve the problems of magnetic dilution of insulating layer, reduce eddy current loss, complicated preparation process, etc., achieve large-scale production, improve saturation magnetic flux density, and prepare simple method effect

Active Publication Date: 2017-06-23
ZHEJIANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] At present, phosphoric acid is often used as a passivating agent for soft magnetic composite materials to passivate the magnetic powder, and the insulating layer obtained is phosphate. Since phosphate is easy to decompose during heating, the insulation performance decreases rapidly, which limits the annealing of the annealing process. temperature, while a lower annealing temperature will lead to incomplete relief of the stress introduced during the press-forming process of the soft magnetic composite, resulting in a higher hysteresis loss
In order to solve this problem, a large number of experiments have been carried out in recent years, such as mixing soft magnetic composite materials with magnesium, evaporating magnesium on the surface of soft magnetic powder by evaporation, and then oxidizing the magnesium on the surface to form magnesium oxide insulation. layer, the cladding layer prepared by this method can exist at a higher temperature, which is beneficial to the stress release of the soft magnetic composite material, thereby having higher magnetic properties, but the preparation process of this method is complicated and the preparation cost is high
In addition, SiO was prepared by sol-gel process 2 , MgO, Al 2 o 3 A lot of research has been carried out as an insulating coating layer, but because the nanoparticles prepared by the sol-gel process and the magnetic powder are attached together by physical adsorption, the binding force is weak, and it is easy to press and form. Shedding occurs, and it is difficult to coat evenly, which is not conducive to reducing eddy current loss
Moreover, the cladding layers prepared by all the above processes are non-ferromagnetic materials, which will cause magnetic dilution when used as an insulating layer, thereby reducing the saturation flux density and effective permeability of the soft magnetic composite material.

Method used

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  • A kind of preparation method of soft magnetic composite material with high saturation magnetic flux density and high magnetic permeability
  • A kind of preparation method of soft magnetic composite material with high saturation magnetic flux density and high magnetic permeability
  • A kind of preparation method of soft magnetic composite material with high saturation magnetic flux density and high magnetic permeability

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preparation example Construction

[0016] The steps of a preparation method of a soft magnetic composite material with high saturation magnetic flux density and high magnetic permeability are as follows:

[0017] 1) Oxidation coating on the surface of magnetic powder: Take magnetic powder and add it to deionized water so that the amount of magnetic powder per 1L of deionized water is 200~800g. o C~350 o C, keep warm for 15~60 minutes and then cool down, so that the surface of the magnetic powder is covered with an insulating layer;

[0018] 2) Adding binder: Pour 0.5% - 2% binder of the surface oxidized magnetic powder into the coated soft magnetic alloy powder, heat and fully stir until the mixture is dry and evenly mixed;

[0019] 3) Compression molding: Add the above magnetic powder to zinc stearate and barium stearate with a mass percentage of 0.25% of the magnetic powder as a lubricant and stir evenly, then press at 800MPa~2000MPa for 10~30s to form a magnetic ring;

[0020] 4) Annealing treatment: heat ...

Embodiment 1

[0024] Add 20g of iron powder into 100g of deionized water, stir and put it into the muffle furnace, at 150 o Under the condition of C, keep warm for 30min, cool to room temperature and take out, the iron powder obtained is added in the xylene solution of 2wt% silicone resin and 10wt%, at 80 o Stir under the condition of C until the powder is dry, then add 0.25wt% zinc stearate and 0.25wt% barium stearate, press into a dense ring under the condition of 800 MPa, for the ring sample at 450 o C conditions for annealing 1 h, made of soft magnetic composites.

[0025] After testing, the loss of the prepared soft magnetic composite material is 688mW / cm 3 (measured at 50mT, 100kHz), the magnetic permeability is 88, and the saturation magnetic flux density is 1.65 T.

Embodiment 2

[0027] Add 80g of sendust powder into 100g of deionized water, put it into the muffle furnace after stirring, at 150 o C conditions, insulation 60min, cooling to room temperature and taking out, the iron powder obtained is added in the ethanol solution of 1wt% epoxy resin and 10wt%, at 80 o Stir under the condition of C until the powder is dry, then add 0.25wt% zinc stearate and 0.25wt% barium stearate, press into a dense ring under the condition of 2000 MPa, for the ring sample at 700 o C conditions annealed for 3 h, made of soft magnetic composites.

[0028] After testing, the loss of the prepared soft magnetic composite material is 208mW / cm 3 (measured at 100mT, 50kHz), the magnetic permeability is 147, and the saturation magnetic flux density is 1.34 T.

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Abstract

The invention discloses a preparation method of a soft magnetic composite material with high saturation magnetic flux density and high magnetic permeability. A new type of soft magnetic composite material is prepared by coating the surface of soft magnetic alloy powder with an insulating coating layer formed of iron oxide by surface oxidation process, followed by bonding, pressing and heat treatment. The advantages of the present invention are: the preparation of soft magnetic composite materials by surface oxidation process is simple, and the thickness of the insulating layer is easy to control, and because the reaction is an in-situ reaction, the generated oxide insulating layer and the soft magnetic alloy have a relatively Strong binding force, not easy to fall off in the subsequent pressing process. The invention does not add chemical components that pollute the environment, does not pollute the environment, has high effective magnetic permeability and low loss, and because the composition of the insulating coating layer is a ferromagnetic oxide, it can effectively reduce the magnetic flux. Dilution phenomenon, so that the obtained soft magnetic composite material has a higher saturation magnetic induction.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a method for preparing soft magnetic composite materials with high saturation magnetic flux density and high magnetic permeability. Background technique [0002] Soft magnetic composite materials have been widely researched and applied in recent years due to their excellent 3D isotropic magnetic properties, high saturation magnetic flux density, low loss, and easy processing into various complex shapes. Soft magnetic composite material is a kind of soft magnetic material obtained by coating the surface of magnetic powder with a layer of insulating material and then pressing it by powder metallurgy. For soft magnetic composite materials, loss is a key technical index, and loss can be divided into hysteresis loss and eddy current loss. Eddy current loss dominates under high frequency conditions. In order to reduce eddy current loss, the surface insulation layer of soft magnetic c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/24B22F3/02
Inventor 严密赵国梁吴琛
Owner ZHEJIANG UNIV
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