METHOD FOR PRODUCING permanent magnets NEODYMIUM Alloys (praseodymium)-iron-boron

摘要

1. A method for producing permanent magnets of alloys based systems neodymium-iron-boron, praseodymium-iron-boron comprising molding the preform and subsequent hot deformation, characterized in that the deformation is performed by equal-channel angular extrusion at intersecting vertical and horizontal channels crossing angle equal to 90-135 ° in the temperature range 500-800 ° C, to achieve a logarithmic cumulative degree of deformation of at least 0,5.2. A method according to claim 1, characterized in that after equal channel angular extrusion carry additional single-stage or multi-stage annealing at temperatures of 500-1000 ° C.3. A method according to claim 1, characterized in that after equal channel angular extrusion operations carried out additional hot deformation preform precipitation methods, rolling, extrusion at a temperature of 500-1000 ° C.4. A method according to claim 3, characterized in that the following further hot deformation operations carried out single-stage or multi-stage annealing at a temperature of 500-1000 ° C.