| 摘要 |
PURPOSE:To manufacture a permanent magnetic material having excellent performance at low cost by molding and sintering the powder of an alloy consisting basically of Fe, B and rare earth elements having specified composition, and thereafter heat-treating the sintered body. CONSTITUTION:The powder of an alloy consisting of by atomic ratio 8-30% R representing rare earth elements containing Y, 2-28% B, <50% Co, 0.1-3% Al and the balance Fe is pressurized and molded in a magnetic field. The molded material is sintered in a non-oxidizing atmosphere at 900-1,200 deg.C for 0.5-4hr. After the sintered body is cooled to room temperature at >=100 deg.C/min cooling rate, it is subjected to aging treatment in a vacuum or inert gas or gaseous reducing atmosphere at the temperature within the range of 350 deg.C- the sintering temperature for 5min-40hr. A permanent magnet material having excellent performance is manufactured at low cost by using the rare earth elements such as Nd and Pr which are abundant but used for only limited purpose, without using scarce rare earth elements such as Sm and by lowering the amount of expensive Co to be used. |
