【摘要】 研究了(Nd_1-xDy_x)₁₆Fe_77.2B_6.8和Nd₁₆Fe_77.2B_6.8+ywt-% Dy₂O₃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Dy₂O₃,Dy原子进入基体相晶粒的外延展,使其K₁²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Dy₂O₃可制造出高H_ci高磁能积（BH）_m的NdFeB系烧结永磁材料。更多还原

【Abstract】 The magnetic properties, microstructure and magnetic hardening of sintered(Nd_1-xDy_x)₁₆Fe_77.2B_6.8and Nd₁₆Fe_77.2B_6.8+y wt-% Dy₂O₃ magnets have been studied. As anaddition of Dy metal to the magnet during smelting, Dy atoms may enter the matrix phaseNd₂Fe₁₄B, so as to enable enhance H_A, fine grains and improve boundary structure, as well asto increase H_ci of the magnet. If Dy₂O₃ added to powder material prior to sintering, Dy atomsdiffuse into the epitaxial layer of grains of matrix phase causing enhancement of K₁¹, 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 Dy₂O₃ about 2--3 wt--%which make a favourable condition for lower cost.更多还原