Low-loss high-superposition Fe-Si-Al magnetic powder core and preparation method thereof

The nanoporous silica clad layer was prepared by metasilicate hydrolysis and alkaline catalyst. Combined with vacuum calcination treatment, the problem of degradation of the ferrosilicon aluminum magnetic powder core under high frequency and DC bias was solved, and the low loss and high superposition performance of the ferrosilicon aluminum magnetic powder core was achieved.

CN120356772AActive Publication Date: 2025-07-22TDG HLDG CO LTD +1
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Patent Information

Application Number
CN202510860393.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-25
Publication Date
2025-07-22
Estimated Expiration
2045-06-25

AI Technical Summary

Technical Problem

The performance of the existing ferrosilicon aluminum magnetic powder core is degraded under high-frequency AC electromagnetics and DC bias, and the eddy current loss and DC bias performance are difficult to meet the high performance requirements at the same time. The existing coating methods have problems such as unevenness, acid-base residue and poor binding strength.

Method used

Nanoporous silica is prepared as a coating agent by using the hydrolysis characteristics of metasilicic acid and alkaline catalyst. A thin and dense coating layer is formed by vacuum calcining treatment, which enhances bonding strength and stabilizes the lattice structure, and reduces hysteresis and eddy current losses.

Benefits of technology

The low loss and high superposition performance of the ferrosilicon aluminum magnetic powder core are achieved, the DC bias performance is improved, the hysteresis and eddy current losses are reduced, and the uniformity and stability of the cladding layer are improved.

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Abstract

The invention belongs to the field of soft magnetic functional materials, and particularly relates to a low-loss high-superposition Fe-Si-Al magnetic powder core and a preparation method thereof, and the preparation method comprises the following steps: preparing a coating agent, passivating coated powder, bonding and lubricating, and pressing and annealing. According to the method, based on the hydrolysis characteristic of metasilicic acid and the hydrolysis promotion effect of the alkaline catalyst, nano-porous silicon dioxide is prepared as a coating agent, meanwhile, the etching effect of alkaline matter on silicon dioxide can effectively increase the specific surface area of the nano-porous silicon dioxide, and the bonding strength of the nano-porous silicon dioxide and iron-silicon-aluminum powder is improved; the vacuum calcination treatment not only removes residual reagents, but also promotes sufficient thermal decomposition of metasilicic acid into silicon dioxide for in-situ coating, and stabilizes the lattice structure of the metasilicic acid. The coating layer of the low-loss high-superposition Fe-Si-Al magnetic powder core is firm in combination, thin and uniform in thickness and stable and compact in structure, the hysteresis loss of the Fe-Si-Al magnetic powder core can be effectively reduced, the direct-current bias performance is improved, and rising of eddy-current loss is avoided.
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