Research and Development of the Super High Energy Products Magnet.
Research and Development of the Super High Energy Products Magnet.
复制标题
超高能量产品磁体的研究与开发。
DOI：
10.2497/jjspm.41.695
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
N. Ishigaki
中科院分区：
文献类型：
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作者：
Y. Kaneko;K. Tokuhara;N. Ishigaki
为了进一步提高Nd-Fe-B烧结磁体的磁性能，人们进行了大量的研究。为了提高该磁体的剩余磁通密度（Br），通过液相烧结将磁体致密化至理论值，同时将烧结过程中产生液相的Nd1.1Fe4B4（T2）和富Nd相的量保持在尽可能低的量，将Nd 2Fe 14 B（T1）基体相的量提高至95%是非常重要的。同时，为了提高R2 Fe 14 B金属间化合物的本征磁化率（iHc），而不添加任何会降低饱和磁化强度的添加剂，控制R2 Fe 14 B金属间化合物的颗粒尺寸及其分布是一项必不可少的关键技术。此外，实现T1晶粒的良好取向是获得超高能磁体的基础技术。通过控制磁体的化学成分和微观结构，获得了Br=1.495T（14.95kG），（BH）max=431 kJ/m ~ 3（54.2MGOe），iHc= 845 kA/m（10.62kOe）的超高能产品磁体。
For a further improvement to achieve extremely high magnetic properties of Nd-Fe-B sintered magnet, extensive investigation has been done. In order to improve the residual flux density (Br) of this magnet, it is very important to increase the amount of Nd2Fe14B(T1) matrix phase up to 95% with keeping the amount of the Nd1.1Fe4B4 (T2) and Nd-rich phases, which generate the liquid phase in the sintering process, as low as posible and to densify the magnet up to the theoretical value by the liquid phase sintering. Also, in order to increase the value of intrinsic coercivity(iHc) without any additives which decrease the saturated magnetization of R2Fe14B intermetallic compound, it is an essential key technology to control the particle size and its distribution to be fine and uniform. Furthermore, for obtaining the super high energy magnet, it is a fundamental technology to realize the excellent alignment of T1 grains. As a result of these investigation on controlling the chemical composition and the microstructure of this magnet, we have succeeded in obtaining the super high energy products magnet having Br=1.495T(14.95kG), (BH)max=431 kJ/m3 (54.2MGOe), iHc=845kA/m(10.62kOe).