Ce-based gap magnets match high-temperature performance of neo

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Temperature performance of the main commercial magnet grades and the Ce-magnet between 0 – 182 oC.  At elevated temperature the Ce-magnet reaches the performance of N45 Neo.
Temperature performance of the main commercial magnet grades and the Ce-magnet between 0 – 182 oC.  At elevated temperature the Ce-magnet reaches the performance of N45 Neo. 

CMI scientists at Ames Laboratory conducted this research.

Achievement

At 200 oC the Ce-based “gap magnet” matches the energy product and exceeds the coercivity of 45 MGOe grades of neodymium-based permanent magnets

Significance and impact

The “gap magnet” may find particular usage in high-temperature (above 150 oC) applications due to its favorably small temperature coefficients of remanence and coercivity

Details and next steps

The remanence coefficient a of -0.06 %/oC is similar to SmCo5, with which this magnet will compete. However, the coercivity coefficient b of -0.13 %/oC is significantly better than the -0.4 %/oC of SmCo5. Future steps will include measurements at temperatures up to 300 oC.