低希土類ボンド磁石用鉄基ハード磁性材料の磁石特性

1:12系窒素侵入型化合物およびFe₃B-Nd

抄録

Hard magnetic properties of nitrogen interstitially-modified NdM_xFe₁₂-_xN_y compounds and Fe₃ B-based ultra-fine crystalline Nd-Fe-Co-T-B alloys of low Nd content of 3-5 at. % are studied. The nitrogen-modified compounds have been prepared via the rapid solidification route and the mechanical alloying route both followed by gas nitrogenation using N₂. The Fe₃B-based materials have been prepared by means of rapid solidification and crystallization heat treatment. The latter materials appear promising as the base material for high-remanence, easy-to-magnetize bonded magnets with small temperature coefficients of the remanence. A typical magnetic properties of compaction isotropic bonded magnets produced from this material are B_r=0.80T, H_cJ=350kA/m and (BH)_max=60.5kJ/m³.