Nd2Fe14B型化合物の磁性とNd-Fe-B磁石の特性 (射出成形・ダイヤモンドおよびcBN薄膜・希土類・セラミックス複合材料<特集>) -- (希土類2--Nd-Fe-B系磁石)

概要

論文の詳細を見る
Temperature dependence of anisotropy field (HA) and spontaneous magnetization (Is) of Nd2Fe14B-type compounds in which Nd or Fe atoms are partially substituted by one of Dy, Co and Al is reported in connection with temperature dependence of intrinsic coercivity (HcI) of sintered Nd-Fe-B-type magnets containing the substituents at the same ratio as in the investigated compounds. Results are discussed in the light of empirical relation among HcI, HA and IS; μ0HcI=μ0HA-IS. Dy is recognized as an indispensible additive that improves the thermal stability of the magnetic properties of the Nd-Fe-B-type magnets, whereas Co, which improves temperature coefficient of remanent induction through a marked increase in the Curie temperature, has no possibility of bringing forth an increased thermal stability.