Development of High-Performance Hot-Deformed Neodymium-Iron-Boron Magnets without Heavy Rare-Earth Elements

Area of Science:

• Materials Science
• Magnetism
• Green Technology

Background:

• Neodymium-iron-boron (Nd-Fe-B) magnets are crucial for green vehicle traction motors due to their high maximum energy product.
• Conventional Nd-Fe-B magnets require heavy rare-earth elements (dysprosium, terbium) for heat resistance, posing resource scarcity issues.
• Developing rare-earth-lean or -free magnets is vital for sustainable electric mobility.

Purpose of the Study:

• To provide an overview of hot-deformed Nd-Fe-B magnets.
• To explore strategies for improving the properties of these magnets by controlling their microstructure.
• To address the challenge of reducing heavy rare-earth element content while maintaining high coercivity.

Main Methods:

• Review of existing literature on hot-deformed Nd-Fe-B magnets.
• Analysis of microstructural control techniques for enhancing magnetic properties.
• Investigation of methods to eliminate or reduce heavy rare-earth elements.

Main Results:

• Hot-deformed Nd-Fe-B magnets possess a fine microstructure that enables high coercivity even with reduced heavy rare-earth content.
• Microstructural engineering is a promising approach to overcome the limitations of conventional Nd-Fe-B magnets.
• These magnets are gaining attention as a viable alternative, especially after recent rare-earth supply chain disruptions.

Conclusions:

• Hot-deformed Nd-Fe-B magnets are a key area of research for sustainable high-performance permanent magnets.
• Further research into microstructural control can unlock the full potential of these magnets for demanding applications.
• Optimizing hot-deformation processes is essential for fabricating advanced Nd-Fe-B magnets with reduced reliance on critical raw materials.