还原—扩散法制取Nd-Fe-B系磁体

Nd-Fe-B Magnet Made by Reduction Diffusion process

摘要: 为了降低具有卓越永磁性的Nd-Fe-B磁体的制造成本,使之更快得到推广使用,本文研究了采用还原—扩散工艺路线,直接用Nd₂O₃作为原材料制取Nd-Fe-B磁体的方法、研究了基本组元Nd和添加元素CO、Al的含量对永磁性能的影响,成功地制造出Nd-Fe-B系永磁体。其中最佳性能为Br＝1.30 T,_MH_C＝0.46 MA/m,(BH)_max＝286.5 KJ/m³。实验结果还表明,氧在合金中起着有害作用,为了获得优异的磁性能,含氧量必须被控制在0.8%以下。

Abstract: In order to reduce the Production cost for making Nd-Fe-B magnets, which has record magnetic Properties, a new production technology, reduction-diffusion process, was studied.In which Nd₂O₃ is used as start ing material to work out Nd-Fe-B permanent magnets directly.
The effecte of the contents of Nd, as basic constituent, and Al, Co, as substitute constituents, and some technologic factors on permanent magnetic properties are studied.
The practical permanent magnets of Nd-Fe-B and Nd-Fe-Co-B are made out.The optimum magnetic properties are Br=13.7 T,_MHc=0. 46 MA/m, (BH)_max=286.5 KJ/m³
The experimental result shows that oxygen is harmful to magnet properties, so it must be controlled below 0.8%.