Preparation method of high-impedance iron-silicon material and integrated inductor containing the iron-silicon material

Abstract

The invention discloses a preparation method of a high-impedance iron-silicon material and an integrated inductor containing the iron-silicon material. A preparation method of a high-impedance iron-silicon material comprises the following steps: selecting 400-500 mesh water atomized iron-silicon powder Carry out ball milling; add the powder after ball milling into the coating solution for insulation coating, and the coating solution is prepared by dissolving two or more of phosphoric acid, aluminum dihydrogen phosphate, chromic acid and potassium water glass in acetone Add the insulating coated powder into the secondary coating solution for secondary coating, and the secondary coating solution is prepared by dissolving one or more of silicone resin and liquid glue in acetone; The coated powder is sequentially granulated, dried and baked; after cooling to room temperature, auxiliary materials are added for stirring and sieving. An integrated inductance is manufactured by pressing and baking the above-mentioned high-impedance iron-silicon material and a coil. The invention effectively improves the particle shape of the powder, greatly improves the insulation between the powder and reduces the loss of the magnetic core.

Description

technical field [0001] The invention relates to the field of inductors, in particular to a method for preparing a high-impedance iron-silicon material and an integrated inductor containing the iron-silicon material. Background technique [0002] At present, many manufacturers will use alloy powder to make integrated inductors. The so-called integrated inductors are inductors formed by integrating the magnetic core and coil made of powder. Among them, the magnetic core is a composite soft magnetic material formed by mixing and pressing alloy powder and insulating medium. Since the surface of the alloy powder particles is evenly coated with a layer of insulating dielectric film, the resistivity of the magnetic core is high, so the eddy current loss Very low, suitable for higher frequency applications. The coil is made of enamelled copper wire, and the paint skin of the enameled wire on the coil is easy to be damaged when the one-piece inductor is die-casted, thus causing an i...

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Problems solved by technology

[0005] The first object of the present invention is to overcome the poor formability of the gas atomized powder in the magnetic core of the integrated inductor in the prior art, and the insulating coating method and coating material in the prior art cannot A good insulating coating film is formed on the surface of the powder, resulting in poor insulation performance between the powder and large core loss. A preparation method for a high-impedance iron-silicon material and an integrated inductor containing the iron-silicon material are provided. The magnetic core can effectively improve the particle shape of the powder, greatly improve the insulation between the powder, reduce the loss of the magnetic core, and improve the overall performance of the integrated inductor

[0006] The second object of the present invention is to overcome the problems of micro-cracks in the integrated inductor in the prior art under the action of electricity, heat and mechanical stress during production, transportation and use, shortening the life of the integrated inductor. To solve the problem of service life, a preparation method of high-impedance iron-silicon material and an integrated inductance core containing the iron-silicon material are provided, so that the microcracks generated in the integrated inductance core can be self-repaired, and the use of the integrated inductance is improved. life

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