Rare earth magnet and preparation method therefor

A rare earth magnet with controlled grain boundary phase and interfacial diffusion process achieves improved magnetic properties and coercivity without heavy rare earths, addressing cost and performance limitations in conventional magnets.

WO2026127193A1 Publication Date: 2026-06-18LG ELECTRONICS INC
0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
LG ELECTRONICS INC
Filing Date
2024-12-13
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

Conventional rare earth magnets face limitations in enhancing coercivity due to grain size constraints, leading to high costs from the addition of heavy rare earth elements like Dy, necessitating a more economical solution with improved magnetic properties.

⚗Method used

A rare earth magnet composition with a controlled grain boundary phase fraction of 15-25% and a thickness of 50-100 nm, manufactured through a method involving hot firing and grain boundary diffusion using an RM modified alloy and binder resin, maintains the ratio of Nd, Pr, and Ce, and includes elements like Al, Cu, Ga, and Sn.

🎯Benefits of technology

The method produces rare earth magnets with enhanced magnetic properties, including a maximum magnetic energy product of 40 MGOe, magnetic flux density of 13 kG, and coercivity of 10 kOe, while avoiding high-cost heavy rare earth additions.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The present invention relates to a rare earth magnet and a preparation method therefor. More specifically, the present invention provides a rare earth magnet which is controlled so that the fraction occupied by the grain boundary phase in the final microstructure, in area percent, is 15 to 25%. The present invention can provide a rare earth magnet exhibiting excellent magnetic properties economically without the addition of high-cost heavy rare earth elements.
Need to check novelty before this filing date? Find Prior Art