초록 ▼

A permanent magnet having substantially stable magnetic properties is disclosed having as the active magnetic component a sintered product of compacted particulate iron-boron-rare earth intermetallic material, said sintered product having pores which are substantially non-interconnecting, a density

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

대표청구항 ▼

[ What is claimed is:] [1.] A sintered intermetallic product comprising compacted and sintered particulate of an iron-boron-rare earth alloy having substantially non-interconnecting pores with a density of at least 87 percent of theoretical and where the alloy further comprises about 13 to about 19

[ What is claimed is:] [1.] A sintered intermetallic product comprising compacted and sintered particulate of an iron-boron-rare earth alloy having substantially non-interconnecting pores with a density of at least 87 percent of theoretical and where the alloy further comprises about 13 to about 19 atomic percent rare earth, where the rare earth content consists essentially of greater than 50 percent praseodymium, an effective amount of light rare earth selected from the group consisting of cerium, lanthanum, yttrium and mixtures thereof, and balance neodymium; about 4 to about 20 atomic percent boron; and balance iron with or without impurities.