Modified slow-release rare earth alloy, sintered neodymium-iron-boron magnet and method for producing same

By sintering modified slow-release rare earth alloys with NdFeB magnets, high-melting-point rare earth intermetallic compounds are used to suppress grain growth, solving the problems of insufficient high-temperature stability and coercivity of sintered NdFeB magnets in the prior art, and achieving performance improvement.

CN122214731APending Publication Date: 2026-06-16BAOTOU RESEARCH INSTITUTE OF RARE EARTHS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BAOTOU RESEARCH INSTITUTE OF RARE EARTHS
Filing Date
2024-12-13
Publication Date
2026-06-16

AI Technical Summary

⚠Technical Problem

Existing sintered NdFeB magnets have shortcomings in terms of high-temperature stability and coercivity improvement. Grain boundary diffusion technology has problems such as shallow diffusion depth, low utilization of heavy rare earth elements, complex diffusion source preparation process, and large consistency fluctuations.

⚗Method used

Modified slow-release rare earth alloys are used. By mixing and sintering the slow-release rare earth alloys with neodymium iron boron magnets, the high melting point rare earth intermetallic compounds gradually melt during the sintering process, which inhibits grain growth, improves intrinsic coercivity and squareness, and reduces the temperature coefficient of intrinsic coercivity.

🎯Benefits of technology

It effectively improves the high-temperature stability and magnetic properties of sintered NdFeB magnets, increases intrinsic coercivity and squareness, reduces the intrinsic coercivity temperature coefficient, and improves the overall performance of the magnets.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a modified slow-release rare earth alloy, a sintered neodymium-iron-boron magnet and a preparation method thereof. 1‑m X m , m is an atomic percentage content, 35at%<=m<=76at%; wherein, RE is a rare earth element, composed of light rare earth elements and heavy rare earth elements; X is selected from at least one of Ga, In, Si, Ge, Sn, Sb, Bi, S, Se and Te. The modified slow-release rare earth alloy can improve the magnetic performance and high-temperature stability of the sintered neodymium-iron-boron magnet.
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