| 摘要 |
PURPOSE:To stably produce a permanent magnet material having superior magnet characteristics with improved pressing power by compacting pulverized power consisting of rare earth elements, B and Fe in a magnetic field, crushing the formed green compact into granules, screening the granules, further crushing the screened granules into powder in an AC magnetic field in a hermetically sealed vessel, compacting the powder in a magnetic field and sintering it. CONSTITUTION:Pulverized powder consisting essentially of, by atom, 10-30% R (one or more among Nd, Pr, Dy, Ho and Tb and one or more among La, Ce, Sm, Gd, Er, Eu, Tm, Yb, Lu and Y), 2-38% B and 65-80% Fe is compacted in a magnetic field to orient the grains in a specified direction. The formed green compact is crushed into granules and the granules are screened. The screened granules of 0.1-3mm diameter are put in a hermetically sealed vessel and crushed into powder in an AC magnetic field. The powder is compacted to the required shape and size under orientation in a magnetic field and the formed green compact is sintered. By this method, a permanent magnet material having uniform magnet characterisitcs can be produced in a high yield. |
