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%.