In order to obtain high energy Nd-Fe-B sintered magnets, extensive studies on processing technologies have been done; (1) Increasing the amount of Nd2Fe14B main phase with keeping the ability of densification through a liquid phase sintering, (2) Controlling the microstructure of sintered magnet to be dense, fine and uniform, (3) Achieving high orientation of Nd2Fe14B main phase grains.
With a new casting process for Nd-Fe-B alloy, improving the preparation of fine powders having a sharp distribution of particle size and to be better lublicating characteristics, and adopting the special CIP process, we have succeeded in obtaining the highest 444 kJ/m3 (55.8 MGOe) magnet. Based on these advanced tecnologies, we can start to massproduce super high performance 400 kJ/m3 Nd-Fe-B magnets for computer applications, communications and so on.