Grain Refinement Technology

  • SC Grain Refinement Core Control Process

  • HD Intergranular Crushing

  • JM Fine-Grain Grinding Low-Grain Powder Production

  • Sintering Grain Control Low-Temperature Long-Time Sintering Process

  • Fine Grain Magnet
Traditional TechnologyGRF-1GRF-2(Current)GRF-3
Grain Size (μm)6-105-83-62-3
Powder Size (μm)3-52.5-3.52-31-1.5
Optimized Rapid Solidification Strip Casting Process

Adjust Cooling Rate

Increase Columnar Grain Proportion

Adjust Casting Temperature

Reduce Columnar Grain Size

Adjust Copper Rod Rotation Speed

Decrease Strip Thickness

Grain Refinement Technology

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Origins of Coercivity

Magnetic Crystal Anisotropy of Hard Magnetism Nucleation Resistance of Reverse Magnetic Domains Expansion Resistance of Reverse Magnetic Domains

Significant Cost Reduction Effect

By adjusting component matching and grain boundary diffusion, cerium-containing magnets achieve the same magnetic properties as non-cerium magnets.

Component Matching/Regulation + Grain Boundary Diffusion

Development of Heavy Rare Earth-Free & Low Heavy Rare Earth Magnets

Development of High-Cu High-Ga Heavy Rare Earth-Free & Low Heavy Rare Earth Magnets
  • Two-Stage Aging

    Low-temperature heat treatment technology to promote the formation of beneficial phases

  • Cu-Ga Process

    Adding Cu and Ga to improve microstructure, forming Nd6(FeCuGa)14 phase, enhancing de-exchange coupling and coercivity

  • Residual O, N, C in Magnets

    Types and dosage of fine powder additives, debinding time

  • Two-Stage Aging

    Mastery of low-rare earth content casting technology to inhibit α-Fe precipitation and precise control of impurity composition

Development of Medium-Boron High-Al Heavy Rare Earth-Free & Low Heavy Rare Earth Magnets

Features: Suitable as medium-performance, cost-effective magnets and ideal as infiltration substrates for high-performance magnets