Low-Rare-Earth NdFeB Magnets Gain 25% Energy Product With Cool-and-Reheat Sintering

Highlights

• Interrupted two-step sintering with intermediate cooling raised NdFeB energy product from 41.48 to 51.70 MGOe—a 25% gain.
• Total rare-earth content held at just 28.6%, demonstrating rare-earth thrifting without sacrificing magnetic output.
• Study is a preprint from NIMTE-CAS; factory-scale yields, energy economics, and long-term performance remain unproven.
• Rare-earth thrifting could reduce NdPr demand per magnet but may expand the addressable market for NdFeB motors, leaving aggregate demand uncertain.