The studies of directional solidified RE-Co magnets

A new kind of rare-earth-cobalt material, Sm 20-24 wt.%/Ce 5-10 wt.%/Fe 8-15 wt.%/Cu 6-15 wt.%/Zr 1-3 wt.%/Co, has been made by directional solidification technology with liquid metal cooling (DSTLMC). The effects of different states, microstructures, and domains on the intrinsic coercive forces, iH_c, were studied. The best magnetic properties of magnets prepared by the DSTLMC are B _r=9500 Gs, iH_c=5000 Oe, and (BH )_m=18.0 MGOe. The magnets can be cut to 0.02 cm in thickness, turned, and drilled. Fine particles of 1/5 phase and zigzag and narrow domains that develop during aging increase the resistance to motion of remagnetization domains, which increases the intrinsic forces of the magnets 525% above those that exist after the preceding solution treatment