Preparation method of anisotropic FeSiAl magnetic core and product

An anisotropic and magnetic core technology, applied in the field of magnetic material preparation, can solve the problems of poor resistance to DC bias, low operating frequency of magnetic core, high magnetic core, etc., and achieve stable performance, which is conducive to mass production and high The effect of magnetic permeability

Inactive Publication Date: 2017-11-21
CENT SOUTH UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method and product of an anisotropic FeSiAl magnetic core to solve the problems of low operating frequency, high core loss, and poor DC bias resistance characteristics of the existing magnetic core.

Method used

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  • Preparation method of anisotropic FeSiAl magnetic core and product
  • Preparation method of anisotropic FeSiAl magnetic core and product
  • Preparation method of anisotropic FeSiAl magnetic core and product

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Embodiment 1

[0025] A preparation method of anisotropic FeSiAl magnetic core, comprising the following steps:

[0026] 1. Put the crushed FeSiAl ingot powder containing Si 10wt%, Al 5wt% and the balance Fe into a vertical sand mill for flattening, control the speed of the sand mill to 900r / min, and grind for 10h to obtain Flaky FeSiAl magnetic powder with a particle size of 20-120 μm and a thickness of 0.2-1.2 μm;

[0027] 2. Classify the obtained flaky FeSiAl magnetic powder to obtain the following five kinds of classified powders with different particle sizes: sample powder 1 (particle size above 100 μm), sample powder 2 (particle size 80-100 μm), and sample powder 3 (particle size 60~80μm), sample powder 4 (particle size 40~60μm), sample powder 5 (particle size below 40μm);

[0028] 3. Using the hydrolysis method of tetraethyl orthosilicate, the 5 kinds of flaky FeSiAl magnetic powders with different particle sizes were coated with SiO on the surface by sol-gel process. 2 deal with; ...

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Abstract

The invention discloses a preparation method of an anisotropic FeSiAl magnetic core and a product. The preparation flow comprises the steps of (1) performing smashing on a FeSiAl cast ingot by adopting a sand mill and then performing flattening treatment to obtain flake-shaped FeSiAl magnetic powder; (2) coating the surface of the flake-shaped FeSiAl magnetic powder with an SiO<2> insulating material by adopting a sol-gel process; (3) performing uniform mixing on the coated FeSiAl and a binder to prepare coating paste, and coating a substrate with the paste, and next, putting the product into a magnetic field to be subjected to orientation; (4) performing hot pressing compaction treatment on the oriented coating sheet, and performing curing at a certain temperature; and (5) performing punch forming on the cured coating sheet to obtain the anisotropic FeSiAl magnetic core. The anisotropic FeSiAl magnetic core prepared in the invention has high insulativity as well as high heat resistance; high magnetic conductivity and low loss value still can be maintained at 1MHz, and high direct current biasing resistance characteristic is still kept; and in addition, the preparation process for the anisotropic FeSiAl magnetic core is mild in conditions, convenient and quick to operate and high in efficiency, and batch production can be promoted.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to a preparation method and product of an anisotropic FeSiAl magnetic core. Background technique [0002] The rapid development of electronics and information technology has put forward higher requirements for the performance of magnetic components. The miniaturization, high frequency and power of magnetic components have become a development trend, and the core material is the key to magnetic components. At present, the commonly used magnetic core materials are mainly iron powder cores, permalloy powder cores, iron silicon powder cores and sendust powder cores. In recent years, due to their unique advantages such as low loss (about 80% of the iron core) and high magnetic permeability (26-125H / m), iron-silicon and sendust cores have gradually replaced iron powder cores and are widely used in Inductance magnetic cores of various filter circuits and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/147H01F1/24B22F1/02
CPCH01F1/14791H01F1/24H01F41/0246B22F1/16
Inventor 颜铄清邓联文廖聪维黄生祥贺君刘胜
Owner CENT SOUTH UNIV
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