Rare earth slurry for grain boundary diffusion, neodymium iron boron diffusion magnet and method

By preparing a rare earth slurry containing thermally conductive powder and performing vacuum heat treatment, the problems of large heavy rare earth usage and uneven diffusion were solved, achieving efficient rare earth utilization and stable magnet performance, which is suitable for high-temperature environments such as new energy vehicles and drones.

CN122266908APending Publication Date: 2026-06-23BAOTOU RESEARCH INSTITUTE OF RARE EARTHS
3 Cites 0 Cited by

Patent Information

Application Number
CN202411892601.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In existing grain boundary diffusion technologies, the large amount of heavy rare earth elements, high diffusion temperature, and shallow diffusion depth result in uneven magnet performance and low rare earth utilization, which cannot meet the needs of high-temperature environments such as new energy vehicles and drones.

Method used

Rare earth slurry is prepared using rare earth powder, thermally conductive powder, binder and organic solvent. Through vacuum heat treatment process, combined with the modification treatment of thermally conductive powder, chemical reaction and thermal resistance are suppressed to achieve uniform diffusion.

Benefits of technology

It improves the utilization rate of rare earth elements and the consistency of magnet performance, shortens the temperature homogenization time, saves energy, and ensures the stability and performance uniformity of magnets in high-temperature environments.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention discloses rare earth slurry for grain boundary diffusion, a neodymium iron boron diffusion magnet and a method. The rare earth slurry for grain boundary diffusion is prepared from raw materials including rare earth powder, heat conduction powder, a binder and an organic solvent, wherein rare earth elements in the rare earth powder comprise light rare earth and / or heavy rare earth; the heat-conducting powder is selected from one of aluminum nitride, silicon carbide and silicon nitride; the weight of the heat conduction powder is 3-10% of the weight of the rare earth powder; the particle size of the heat conduction powder is 15-40 times that of the rare earth powder. According to the rare earth slurry for grain boundary diffusion, the subsequent magnet diffusion effect and the rare earth utilization rate can be improved.
Need to check novelty before this filing date? Find Prior Art