High-Temperature Rare Earth Permanent Magnet Materials

High-temperature Sm2Co17-based rare earth magnets have been developed at UDRI.  The maximum operating temperature of permanent magnets has been increased from 300°C to 550°C.  Abnormal temperature coefficients of some new magnets have been observed and explained by a new coercivity model.

This work was conducted in UDRI’s Magnetic Materials group. To learn more, please contact Dr. Sam Liu.

Demagnetization curves of the new and conventional magnets in a dynamic characterization.

(Left) Temperature dependence of coercivity of various Sm2Co17-based magnets.
(Right) Abnormal temperature dependence of a new Sm2Co17-based magnet.