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High-efficiency soft magnetic composite material and preparation method thereof

A soft magnetic composite material and composite material technology, applied in the field of high-efficiency soft magnetic composite materials and their preparation, can solve the problems of soft magnetic composite materials that cannot be sintered, the internal stress of the insulating layer is damaged, and the insulating film is easy to be brittle. Structural parameters are controllable, eddy current resistance is improved, and stress is thoroughly eliminated

Active Publication Date: 2011-07-27
CHANGCHUN UNIV OF TECH
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  • Application Information

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Problems solved by technology

It solves the technical problems that the insulating film is easy to be brittle, the coating is uneven, the preparation process is complicated, and the soft magnetic composite material cannot be sintered after pressing.
The problem with the composition of SMCs is that resins and inorganic dielectric materials lead to B s reduce
Problems in the preparation process: In order to increase the compact density, the use of a large molding pressure leads to the destruction of the insulating layer and the increase of the internal stress; in order to eliminate the internal stress, the annealing at a higher temperature leads to the softening of the organic matter and the oxidation of the iron powder
SMCs with a uniform and complete ferrite insulating layer with high density have not been reported yet

Method used

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  • High-efficiency soft magnetic composite material and preparation method thereof

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Embodiment

[0047] The preparation process is as figure 1 As shown, the Fe-based alloy was first gas-atomized, and the prepared powder was sieved. Mixed particle size aerosolized powder and commercially available nano soft magnetic Zn with a particle size below 63 μm 0.5 Ni 0.5 Fe 2 o 4 Ferrite powder is the raw material. Fe-based alloy powder and Zn 0.5 Ni 0.5 Fe 2 o 4 Nanopowder is mixed by 19:1 (weight ratio), grinds and makes Zn 0.5 Ni 0.5 Fe 2 o 4 The nanometer powder is evenly coated on the surface of the Fe-based alloy powder, and the blank is cold-pressed for SPS sintering. The SPS test was carried out on the SPS-1050 spark plasma sintering machine of Sumitomo Company, using a cemented carbide mold with an inner diameter of 15mm. Graphite paper is placed between the female mold and the male mold and between the male mold and the sample. After pre-tightening, the galvanic temperature measurement hole and the center of the sample are at the same height to ensure that th...

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Abstract

The invention discloses a high-efficiency soft magnetic composite material and a preparation method thereof. The material is in a nest wall structure composed of soft ferrite of high electrical resistivity; the ferrite in the nest wall structure completely isolates the soft magnetic metal in the nest or an alloy particle soft magnetic phase to cause the soft magnetic metal in the nest or the alloy particle soft magnetic phase to mutually isolate; the content of the soft magnetic metal or the alloy particle is 50-99wt%; and the balance is the soft ferrite. The preparation method comprises the following steps: mixing the soft magnetic metal or alloy particles and the soft ferrite powder at a ratio; causing the soft ferrite powder to completely and evenly coat the surface of the soft magnetic metal or the alloy particles; complexly sintering and shaping by spark plasma sintering densification; and finally, carrying out stress removal annealing heat treatment. The high-efficiency soft magnetic composite material has the characteristics of high-saturation induction density, high resistivity, high magnetic conductivity, low coercive force, low magnetic core loss and excellent comprehensive mechanical property. The high-efficiency soft magnetic composite material can be applied to occasions with higher working efficiency, high magnetic field and high stress. The preparation method issimple and the technological operation is convenient.

Description

technical field [0001] The invention relates to soft magnetic materials, in particular to a high-efficiency soft magnetic composite material and a preparation method thereof. technical background [0002] Magnetic materials are important basic materials in national defense and national economy. In recent years, there has been a trend of using electric drive devices and electronic control devices to realize product drive, automatic control and multi-function. One of the key core materials is soft magnetic materials. It is urgent to develop high-response, high-power-density, low-loss The soft magnetic material realizes the miniaturization and high efficiency and energy saving of the device. [0003] Soft magnetic materials mainly include metal soft magnetic materials represented by silicon steel; ferrite ferrimagnetic soft magnetic materials; and amorphous and nanocrystalline soft magnetic materials. Metal soft magnetic materials (including amorphous and nanocrystalline allo...

Claims

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Application Information

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IPC IPC(8): H01F1/24H01F1/12B22F3/105
Inventor 赵占奎王明罡
Owner CHANGCHUN UNIV OF TECH
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