| 摘要 |
PURPOSE:To improve the magnetic characteristics by mixing Al-Ni-Co-Fe alloy powder having a specified particle size distribution with powders of the constituent elements, molding the mixture, and sintering it in vacuum or a nonoxidizing atmosphere. CONSTITUTION:Al-Ni-Co-Fe or Al-Ni-Fe alloy powder whose principal part is particles having <=200 mesh particle size is mixed with powders of the constituent elements such as Al and Ni having <=200 mesh or powder of an alloy thereof, and the mixture is press-molded after adding a binder. The molded body is heated at a proper temp. to remove the binder, and it is sintered in vacuum or a nonoxidizing atmosphere to obtain an Al-Ni-Co-Fe or Al-Ni-Fe type sintered magnet alloy. Since powders having <=200 mesh are used as starting materials, reduction in sintering density is prevented, and reduction in Br as one of magnetic characteristics can be also prevented by the uniform diffusion of the constituent atoms during sintering. Accordingly, the magnetic characteristics of the sintered magnet alloy are improved. |
