Praseodymium-rich iron-boron-rare earth composition, permanent magnet produced therefrom, and method of making

摘要: A permanent magnet having substantially stable magnetic properties is disclosed as the active component a sintered product of compacted particulate iron-boron-rare earth intermetallic material, said pores which are non-interconnecting, density at least 87 percent theoretical and composition consisting essentially in atomic about 13 to 19 rare elements, 4 20 boron 61 83 iron with or without impurities; where content greater than 50 praseodymium an effective amount light selected from group cerium, lanthanum, yttrium mixtures thereof, balance neodymium.