Hot-roll magnet performance exceeds N38UH grade at 175°C

CMI researchers from Ames National Laboratory conducted the activity for this highlight

Innovation  
Demonstrated that the CMI “Hot-Roll” magnet exceeds, at 175o C, the performance of the Dy-employing ultra-high temperature NdFeB magnet grade N38UH.

Achievement 
Demonstrated the UH grade performance of the Dy-free nano-Neo magnet. The team obtained a hot-rolled magnet with 22 MGOe BHmax and 6 kOe coercivity at 175°C, which both exceed the properties of the commercial N38UH grade magnet at 180°C.

Significance and Impact 
This result, achieved without Dy usage, will effectively reduce the need of HREE such as Dy for the high temperature high performance magnets demanded by the EV motor application.

Hub Target Addressed 
Microstructural engineering to reduce the need for dysprosium.

Comparison of hysteresis loops for the CMI Hotroll NanoNeo (HR) and the commercial N38UH grade magnets at 25 and 180°C. Note the greater coercivity and remanence of the CMI HR magnet at 175 C.