Evaluation of Practicality for Fully Dense Isotropic Sm-Fe-N Magnets Made by Shock-Wave Consolidation Method

Fully dense isotropic Sm-Fe-N magnets were successfully fabricated using the shock-wave consolidation method. Deterioration of the hard magnetic properties of the Sm-Fe-N by the impact load during the consolidation process was not observed, and consequently the fully dense magnet showed high (BH)
max
of 116-144 kJ/m
³
(14.5-18 MGOe) which is the highest level as the isotropic magnet. Its temperature coefficient of B
r
was 0.066 %/°C, and that of coercivity was 0.36 %/°C. The irreversible flux loss of the sample with L/D of 0.78 after exposed at 150 °C was small value of 5-10 %. The fully dense Sm-Fe-N magnet without coating showed a good corrosion resistance, and it had enough mechanical strength. From these results, the practicality of the fully dense Sm-Fe-N magnet made by shock wave consolidation has been confirmed.