Preparation method of integrally formed inductor

Abstract

The invention discloses a preparation method of an integrally formed inductor, and relates to the field of magnetic electronic materials, which is characterized by comprising the following steps of: 1, selecting materials, namely selecting soft magnetic powder such as superfine carbonyl iron powder, iron silicon, iron silicon chromium, iron nickel, iron cobalt and the like as basic powder of the integrally formed inductor according to the requirements of use frequency (0.1-20MHz), inductance value, power loss, RDC and Isat of an inductance device; and 2, screening, wherein the soft magnetic powder with certain particle size distribution is screened out through a screening mechanism and a powder grading technology. The invention innovatively provides a metal soft magnetic alloy-soft magnetic ferrite in-situ compounding technology, so that the surface insulation effect of the alloy magnetic powder is ensured, the magnetic performance is effectively prevented from being reduced, and the comprehensive performance of the integrally formed inductor is improved; the Co trace element is adopted to replace Fe, so that the saturation flux density of the alloy is improved; cr is partially replaced by Ni, Mo, Nb and the like, so that the content of the Cr element is reduced, and the corrosion resistance is improved.

Description

technical field [0001] The invention relates to the field of magnetic electronic materials, in particular to a method for preparing an integrally formed inductor. Background technique [0002] As high-speed and large-capacity 5G communication technology and third-generation semiconductor technologies such as SiC and GaN are gradually becoming practical, electronic devices are developing rapidly in the direction of miniaturization, high frequency, high integration, multi-function, and wearable. This also puts forward new requirements for electronic information materials. As an indispensable soft magnetic material and device in the process of electromagnetic transformation, transmission, and information emission, transmission, reception, processing, and recording, it is faced with high frequency and low power consumption. The huge challenge has become a key factor restricting the development of next-generation electronic devices. The requirements for high-speed and large-capac...

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Problems solved by technology

[0003] However, in the preparation process of integral molding inductors, the powder grading technology is relatively backward. At high frequencies, the loss of soft magnetic materials is mainly determined by eddy current loss. The particle size of powder is the key factor determining eddy current loss. In addition, powder The gradation of soft magnetic materials also affects the fluidity, filling type, saturation magnetic flux density and DC bias of soft magnetic materials. Therefore, accurate powder gradation is the key to the preparation of high-performance soft magnetic materials. The particle size requirements are very high, usually below 10 microns, usually the cyclone separation technology can realize the screening of powder particle size, but the accuracy is poor, and it is difficult to separate powders below 1 micron

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