The nitrogenation behaviour of a Sm-Fe-Ta based alloy which can be use
d for the preparation of Sm-Fe-N based permanent magnets has been desc
ribed, Diffusion experiments on thin polished plates provided the nitr
ogenation processing parameters. Thermomagnetic analysis of partially
and fully nitrided powders showed that the required nitrogenation time
s are somewhat lower than the calculated values, which was attributed
to the powder condition.