| 摘要 |
PURPOSE:To produce a permanent magnet consisting of rare earth element and having excellent magnetic characteristics with a simple stage by cooling ultra-quickly the melt of a rare earth-contg. ferrous alloy having a specific compsn. and forming the melt to a thin sheet shape then cutting out the sheet to a prescribed shape and welding the cut sheets by press welding. CONSTITUTION:The melt of the alloy expressed by chemical formula (1) is manufactured. (In the formula, R is at least one kind selected from Y, La, Ce, Pr, Nd, Pm and Sm, M is at least one kind selected from B, C, Si, P, Al, Ge, As and Sb, a; 10-35atomic%, b; 5-25atomic%). The melt is ultra-quickly cooled and is formed into a thin sheet having 0.5mm thickness which is then blanked to a desired shape. Plural sheets of the blanked sheets are laminated and press-welded by a press. The laminate is welded at 1,180 deg.C in a vacuum and is further subjected to an aging treatment for 5 hours at 700 deg.C. The permanent magnet consisting of rare earth element and having the excellent magnetic characteristics such as coercive force, residual magnetic flux density and max. energy product is thus obtd.
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