Sintered samarium-cobalt magnet, method for producing the same, and use thereof

By optimizing the composition of samarium-cobalt magnets and performing solid solution treatment under loaded stress, the problem of uniform precipitation of cell wall phase in sintered samarium-cobalt magnets was solved, and high-performance sintered samarium-cobalt magnets with high remanence, high coercivity and high energy product were prepared.

CN122370108APending Publication Date: 2026-07-10GANJIANG INNOVATION ACAD CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GANJIANG INNOVATION ACAD CHINESE ACAD OF SCI
Filing Date
2026-06-09
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing technologies make it difficult to achieve uniform precipitation of the 1:5H cell wall phase and the formation of cellular structures in sintered samarium cobalt magnets with high magnetic energy product and low temperature coefficient, leading to deterioration of coercivity and squareness of demagnetization curves.

Method used

By optimizing the composition of samarium-cobalt magnets and performing solid solution treatment under loaded stress conditions, the transformation of lattice defects to low-energy states is promoted, the nucleation of cellular structures and the diffusion and segregation of elements are facilitated, the heat treatment time is shortened, and the magnetic properties are improved.

Benefits of technology

A sintered samarium-cobalt magnet with high remanence, high coercivity and high energy product was achieved, with a continuous and uniform cellular structure, which shortened the preparation cycle.

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Abstract

The application discloses a sintered samarium-cobalt magnet and a preparation method and application thereof, and relates to the field of rare earth permanent magnet materials. A structural general formula of the sintered samarium-cobalt magnet is Sm g RE h (Fe a Cu b Zr c M d Co e ) f , RE includes at least one of Pr, Er, Ce, Nd, La and Dy, and M includes at least one of Al, B, Ti, Nb and Mn. The application is helpful to inhibit the volatilization of rare earth and promote the formation of a uniform phase structure of a solid solution state magnet, is favorable to the formation of a cellular structure and the reasonable segregation of Cu / Fe elements, and effectively realizes the uniform precipitation of 1:5H cell wall phases and the control of the growth behavior of 2:17R cellular phases in the iron-rich samarium-cobalt magnet through the synergistic regulation of stress-assisted solid solution, so that the sintered samarium-cobalt magnet with high remanence, high coercivity and high magnetic energy product is ensured.
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