Samarium-based rare earth permanent magnet material, and preparation method therefor and application thereof

EP4379755A4Active Publication Date: 2025-08-06HENGDIAN GRP DMEGC MAGNETICS CO LTD
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Patent Information

Application Number
EP2023826088
Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
Priority Date
2022-06-20
Filing Date
2023-05-30
Publication Date
2025-08-06
Estimated Expiration
2043-05-30

AI Technical Summary

Technical Problem

Current samarium-based rare-earth permanent magnet materials face challenges with oxidation resistance and magnetic property degradation at high temperatures, as well as complex and costly preparation processes, limiting their performance and efficiency in applications.

Method used

Introducing vanadium, copper, and molybdenum elements into the samarium-iron-nitrogen alloy, with controlled atomic ratios and a simplified preparation method involving melting, rapid-solidification, nitriding, ball-milling, phosphating, and heat treatment to enhance magnetic properties and oxidation resistance.

Benefits of technology

The modified samarium-based rare-earth permanent magnet material achieves excellent magnetic performance with remanence up to 7180 Gs, coercivity of 10350 Oe, and a magnetic energy product of 12.3 MGOe, while maintaining oxidation resistance and reducing production costs, making it suitable for small electrical machines and sensors.

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Abstract

Disclosed in the present invention are a samarium-based rare earth permanent magnet material, and a preparation method therefor and an application thereof. In the samarium-based rare earth permanent magnet material Sm2FeαCuβVγMoδNε, 11.5 ≤ α ≤ 17.5, 0.1 ≤ β ≤ 0.4, 1.0 ≤ y ≤ 1.8, 0 ≤ δ ≤ 1.0, and 2.9 ≤ ε ≤ 4.0. According to the samarium-based rare earth permanent magnet material provided by the present application, a good balance of the remanence and the coercivity is promoted by doping with vanadium, copper, and molybdenum and adjusting to an appropriate atomic ratio range, such that the samarium-based rare earth permanent magnet material has excellent comprehensive magnetic performance. The preparation method provided by the present application is simple to operate, low in cost, and suitable for the fields of small and special motors, magnetic sensors, or audio equipment.
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