Effects of rare earth oxide addition on NdFeB magnets.
Effects of rare earth oxide addition on NdFeB magnets.
复制标题
稀土氧化物添加对NdFeB磁体的影响。
DOI：
10.3379/jmsjmag.11.235
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发表时间：
1987
影响因子：
--
通讯作者：
Y. Tawara
中科院分区：
文献类型：
--
作者：
K. Ohashi;T. Yokoyama;Y. Tawara
研究了添加稀土氧化物对Nd-Fe-B烧结磁体磁性能的影响。Dy_2 O_3和Tb_4 O_7的加入提高了本征矫顽力。对于Dy_2O_3的添加，确定了粉末混合和Dy_2O_3粒度的最佳条件。为了获得高的本征介电常数，混合时间应大于10 min，Dy_2O_3的粒径应小于3μm。对添加Dy 2 O3的NdFeBAl磁体的EPMA测量表明，Dy在Nd 2Fe 14 B基体中分布不均匀，Dy在晶界附近富集，而在基体内部富集。这种不均匀分布的Dy原子的形成是由于还原的Dy 2 O3在富Nd相，然后扩散到基体中的Dy原子。
Effects of rare-earth oxides addition on the magnetic properties of the Nd-Fe-B sintered magnets are studied. The addition of Dy2O3 and Tb4O7 increases the intrinsic coercivity. For Dy2O3 addition, the optimum conditions for the powder mixing and Dy2O3 particle size are determined. A mixing time of over 10 minutes and the Dy2O3 particle size under 3μm are required to obtain a high intrinsic coercivity. EPMA measurements on NdFeBAl magnets added with Dy2O3 reveal an inhomogeneous distribution of Dy in the Nd2Fe14B matrix; Dy is rich near the grain boundary but poor inside of the matrix. Formation of such an inhomogeneous distribution of Dy atoms is attributed to reduction of Dy2O3 in the Nd-rich phases followed by diffusion of the Dy atoms into the matrix.