Three-shell iron-silicon-substrate soft magnet composite material and manufacturing method thereof

Abstract

The invention relates to a three-shell iron-silicon-substrate soft magnet composite material and a manufacturing method thereof. The technical scheme is characterized in that iron-silicon alloy powderis placed into water according to a iron-silicon alloy powder to water mass ratio of 1:(5-100); the mixture is stirred for 5-30 h at 30-80 DEG C; composite powder is obtained after solid-liquid separation; the composite powder is subjected to vacuum drying and placed in a mould; the powder is moulded through cold pressing under the condition of 300-1200 MPa to obtain a blank body; the blank bodyis placed in a high-temperature sintering furnace, is heated to 800-1300 DEG C at a vacuum condition or at a protection atmosphere condition, and is sintered for 0.5-5 h to obtain the sintered blank body; the sintered blank body is placed in a thermal treatment furnace, is heated to 500-1200 DEG C at the vacuum condition or the protection atmosphere condition and is subjected to thermal treatmentfor 0.5-5 h; and the blank body is furnace cooled to obtain the three-shell iron-silicon-substrate soft magnet composite material. The manufacturing method is simple in technique and low in productioncost; the manufactured product is not only uniform in isolation layer and extremely low in magnetic loss; and besides, the saturation flux density is high and constant magnetic permeability is high.

Description

technical field [0001] The invention belongs to the technical field of iron-silicon-based soft magnetic composite materials. In particular, it relates to a three-shell iron-silicon-based soft magnetic composite material and a preparation method thereof. Background technique [0002] FeSi-based soft magnetic composite materials are widely used in inverters, Electronic components such as inductors, transformers, and choke coils are involved in many fields such as motors, telecommunications, and power supplies. [0003] It is worth mentioning that as the frequency of use increases, the eddy current loss of soft magnetic composite materials increases exponentially, and the insulating coating of magnetic particles is undoubtedly the most effective way to reduce eddy current loss. On this basis, insulation coating is mainly divided into two types: organic coating and inorganic coating. The common organic coating method is to mix magnetic particles and organic coating materials ...

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Problems solved by technology

The insulating layer of the obtained soft magnetic composite material is relatively uniform, and the magnetic properties are good, but the preparation process is complicated, the operation is not easy, and the loss of energy and raw materials is large, which is not conducive to mass production.

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