Magnetic pellets containing magnetic particles of various sizes, and a method for manufacturing the same and applications thereof

CN122337804APending Publication Date: 2026-07-03NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACAD OF SCI
Filing Date
2025-03-03
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In the existing technology, the preparation methods of anisotropic bonded magnets are prone to agglomeration between magnetic powder particles and random orientation of magnetization axes, resulting in high molding process difficulty and low preparation efficiency. In addition, the temperature resistance of high-performance magnets is limited, especially in the condition of room temperature to 80°C, it is difficult to achieve high remanence and high magnetic energy product.

Method used

A directional mixed particle group structure of multi-size magnetic particles is adopted. Each directional mixed particle group consists of small-size magnetic particles coating large-size magnetic particles to form a core-shell structure. Magnetic particles with preferential orientation along the easy magnetization axis are prepared by non-contact magnetic field magnetization and drying shaping process.

Benefits of technology

It improves the orientation ability and magnetic properties of bonded magnets under conditions of room temperature to 80°C, reduces the dependence of the molding process on high heat, increases magnet density and magnetic energy product, simplifies the molding process, and improves preparation efficiency.

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Abstract

This invention belongs to the field of functional materials technology, and relates to a magnetic granular material containing multi-size magnetic particles, its manufacturing method, and its application. The magnetic granular material comprises oriented mixed particle groups, each group including small-size and large-size magnetic particles. The surface of the large-size magnetic particles is coated with small-size magnetic particles, and the surface of the magnetic particles is coated with a binder. The magnetic particles within each oriented mixed particle group have a preferred orientation along the easy magnetization axis. The magnetic granular material with oriented mixed particle groups can not only improve the orientation degree of magnetic powder and magnets under high-temperature forming conditions, but also increase the weight proportion of small-size magnetic powder particles in extremely high-magnetic magnets. Simultaneously, it can reduce the dependence of multi-size magnetic powder bonded magnets on high heat in the forming process, achieving high orientation and high performance of formed magnets under low-temperature conditions (room temperature to 80℃) and room temperature conditions, thereby reducing process difficulty and improving process efficiency.
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Citation Information

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