研究了(Nd_(1-x)Dy_x)_(16)Fe_(77.2)B_(6.8)和Nd_(16)Fe_(77.2)B_(6.8)+ywt-％ Dy_2O_3磁体的磁性能、显微结构和磁硬化,在冶炼时添加Dy,Dy原子进入基体相,使其H_A提高,并细化晶粒和改善边界结构,提高磁体的矫顽力H_c,在制粉时添加Dy_2O_3,Dy原子进入基体相晶粒的外延展,使其K_1~2提高,同样细化晶粒和改善边界结构,并减少外延层厚度,提高磁体的矫顽力H_(ci),添加约2—3Wt—％的Dy_2O_3可制造出高H_(ci)高磁能积(BH)_m的NdFeB系烧结永磁材料。
The magnetic properties, microstructure and magnetic hardening of sintered(Nd_(1-x)Dy_x)_(16)Fe_(77.2)B_(6.8)and Nd_(16)Fe_(77.2)B_(6.8)+y wt-% Dy_2O_3 magnets have been studied. As anaddition of Dy metal to the magnet during smelting, Dy atoms may enter the matrix phaseNd_2Fe_(14)B, so as to enable enhance H_A, fine grains and improve boundary structure, as well asto increase H_(ci) of the magnet. If Dy_2O_3 added to powder material prior to sintering, Dy atomsdiffuse into the epitaxial layer of grains of matrix phase causing enhancement of K_1~1, also refine-ment of grains and improvement of boundary structure. The NdFeB based permanent magnetswith higher H_(ci) and greater (BH)_m may be produced by adding Dy_2O_3 about 2--3 wt--%which make a favourable condition for lower cost.
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