Neodymium magnets are integral to EV drive motors, generators, and industrial equipment, demanding both thermal stability and strong magnetic properties. Grain boundary diffusion technology preserves coercivity at high temperatures by introducing a diffusion source of rare earth elements such as dysprosium (Dy) or terbium (Tb), which are applied to the magnet surface and diffused into grain boundaries during heat treatment.
S-LEC™ AS Series from SEKISUI Specialty Chemicals is an acrylic binder engineered for superior dispersion stability, uniform thin-film application, and minimal residue during debinding. Efficient placement of diffusion materials optimizes rare earth utilization and facilitates process design for grain boundary diffusion.
In grain boundary diffusion processing, apply Dy or Tb sources uniformly across the magnet surface and ensure efficient diffusion during heat treatment. Variations in coating or film thickness can lead to inconsistent results, insufficient coercivity with excessive rare-earth use, or processing residue issues.
To solve these issues, diffusion source pastes need stable dispersion, resistance to sedimentation, uniform thin-film coating, strong retention after drying, and low residue during debinding. S-LEC™ AS Series offers proper viscosity for coating and controlled decomposition, improving the use of diffusion sources.
S-LEC™ AS Series is an acrylic binder engineered to enhance the efficiency of diffusion sources containing rare earth elements such as Dy and Tb in NdFeB magnet processing. Its tailored rheology ensures consistent, thin, and uniform coating of the diffusion paste, reducing aggregation, sedimentation, and coating inconsistencies.
In addition, its thermal decomposition characteristics are designed to minimize residual carbon after debinding, thereby supporting cleaner heat-treatment conditions. These features make it easier to consider process designs that aim for the required magnetic performance without relying on excessive amounts of diffusion material. As a result, S-LEC™ AS Series contributes to more controlled evaluation and optimization of rare earth usage in grain boundary diffusion processes.
When selecting a binder for diffusion source pastes, verify its binding properties and its ability to disperse and uniformly coat rare-earth diffusion sources. Also, check if it minimizes residue after degreasing. The S-LEC™ AS Series is an acrylic binder for applications needing low-temperature degreasability, low carbon residue, and compatibility with screen printing and dip coating. If you need to apply diffusion sources like Dy or Tb in a thin uniform layer and optimize usage, focus on the viscosity design and thermal decomposition properties of S-LEC™ AS Series.
Please contact us to arrange a sample request tailored to your firing profile, solvents, diffusion sources, and application methods.
In grain boundary diffusion processing for neodymium magnets, applying the diffusion source paste uniformly to the magnet surface ensures stable performance. S-LEC™ AS Series stabilizes diffusion paste behavior by overcoming particle aggregation, sedimentation, coating unevenness, and residual carbon after debinding.
Its stable dispersion, viscosity tailored for coating, and controlled thermal decomposition simplify evaluation of coating methods such as printing and dipping. These features enable operators to achieve consistent thin-film coatings and debinding with less residue. As a result, they can place diffusion materials efficiently where needed, supporting process designs that achieve target coercivity with less rare-earth material.
Q. Can S-LEC™ AS Series reduce rare earth usage?
A. It helps improve utilization efficiency of diffusion sources by supporting dispersion stability, uniform thin coating, and low residue during debinding. The actual reduction depends on the diffusion materials, coating conditions, heat treatment, and target magnetic properties, so evaluation under your conditions is recommended.
Q. In what form is S-LEC™ AS Series supplied?
A. We provide it in solution form to ensure easy handling and better dispersion in slurry systems.
Q. What information should I provide for a sample request?
A. Details like diffusion source type, solvent, viscosity, solids content, coating method, drying, debinding conditions, temperature profile, and required magnetic properties enable more specific material recommendations.
Q. What coating methods can I use with this product?
A. S-LEC™ AS Series is suitable for coating processes such as printing and dipping. Applicability should be evaluated based on diffusion materials, solvents, viscosity, solids content, film thickness, and drying conditions.
Q. How should I choose between S-LEC™ BK Series and S-LEC™ AS Series?
A. S-LEC™ BK Series is suitable when high film strength and flexibility are required, while S-LEC™ AS Series is recommended when low-temperature debinding, low residual carbon, and coating performance are prioritized. Selection depends on process and performance requirements.
