DIE-UPSET MANUFACTURE TO PRODUCE HIGH VOLUME FRACTIONS OF RE-FE-B TYPE MAGNETICALLY ALIGNED MATERIAL

摘要

C-4012 DIE-UPSET MANUFACTURE TO PRODUCE HIGH VOLUME FRACTIONS OF RE-Fe-B TYPE MAGNETICALLY ALIGNED MATERIAL A method to increase the volume fraction of magnetically aligned material in rare earth (RE), iron, boron type anisotropic permanently magnetic material includes forming an adaptively shaped fully dense substantially magnetically isotropic preform from relatively coarse powder particles of melt spun alloy with a very fine grain RE2Fe14B phase. The preform is heated and die upset to provide uniformity of strain in the preform as it is conformed to the die thereby to cause an increased percentage of the crystallites to be oriented along a crystallographically preferred magnetic axis which increases the energy product of a resultant magnet.